Consulta: subjectFacets:"Nutrients"
Registros recuperados: 238
Data/hora: 09/06/2024 01:05:09

Efecto de la aplicación de compost de cachaza y fertilizante químico en suelos calcáreos en la corrección de clorosis férrica y rendimiento de sorgo.
Provedor de dados: 32
Autores: Cortez Hernández, Graciano.
En la Mixteca Poblana, predominan suelos calcáreos que por su pH alcalino impiden que las plantas puedan absorber los nutrimentos como hierro y zinc, ocasionando la clorosis férrica, afectando los cultivos de esta región, tales como: caña de azúcar, sorgo, maíz, frijol e incluso los árboles frutales, repercutiendo en el desarrollo, rendimiento y en casos severos la muerte de la planta. En esta región está ubicado el ingenio azucarero de Atencingo que genera anualmente 45 mil toneladas de desechos orgánicos (cachaza). El objetivo de esta investigación fue evaluar el efecto de la incorporación de compost de cachaza al suelo en la corrección de clorosis férrica y rendimiento de sorgo. Se incorporó compost de cachaza a razón de cero, cinco y diez t ha-1 en...
Palavras-chave: Dosis de fertilización; Compost de cachaza; Deficiencia; Nutrimentos; Fertilización orgánica; Dose of fertilization; Compost; Filter cake; Deficiency; Nutrients; Organic fertilizer; Maestría; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2010
URL: http://hdl.handle.net/10521/335

Deficiencias nutrimentales en huertos de guayabo y su relación con la incidencia de peca en fruto.
Provedor de dados: 32
Autores: Cardoso del Río, Israel.
Con el objetivo de identificar las deficiencias nutrimentales relacionadas con la incidencia de la peca de la guayaba en región oriente del estado de Michoacán, se realizó un muestreo de suelo y foliar el 8 de mayo de 2007 para la obtención de un diagnóstico preliminar para la posterior aplicación de tratamientos foliares que contrarrestaran posibles deficiencias relacionadas con los daños de la peca en fruto, en tres huertos de los municipios Zitácuaro, Juárez y Jungapeo. La aplicación de los tratamientos fue vía foliar, éstos fueron: 1) fertilización mineral, empleando la formulación NV3, consistente en 1.0, 1.0, 2.0, 2.0, 2.0, 0.03, 0.05, 0.02, 0.05 y 0.02 g L-1 de Urea, MgSO4, KNO3, CaNO3, KH2PO4, H3BO3, MnSO4 4H2O, CuSO4 5H2O, ZnSO4 7H2O y FeEDTA,...
Palavras-chave: Psidium guajava; Guava; Guayaba; Michoacán; Deficiencias nutrimentales; Nutrimientos; Nutrients; Nutrimental dynamics; Maestría; Edafología.
Ano: 2010
URL: http://hdl.handle.net/10521/197

Fertilización con potasio y boro en plantaciones forestales comerciales de Eucalyptus spp. en el sureste mexicano.
Provedor de dados: 32
Autores: Rodríguez Juárez, Mitzy Irais.
El presente estudio se realizó con la finalidad de conocer el efecto de la adición de B y K sobre el crecimiento de Eucalyptus grandis y E. urophylla en plantaciones forestales comerciales de la empresa Forestaciones Operativas de México, S.A. de C.V.  (FOMEX) en Huimanguillo, Tabasco. Se eligieron 199 árboles de E. urophylla y 239 de E. grandis que recibieron durante el establecimiento diferentes dosis de K y B, a los cuales se les midieron diámetro y altura a las edades de 1.5, 4.5 y 11 años. El K no tuvo efecto sobre ninguna especie en ninguna variable, por lo cual se realizó un análisis por nivel de B en E. urophylla, dado que fue la única especie que respondió a este nutrimento. Además se realizó un muestreo destructivo en el que se dividió al árbol...
Palavras-chave: Plantaciones comerciales; Crecimiento; Biomasa aérea; Nutrimentos; Eucalyptus; Commercial forestry plantations; Tree growth; Aerial biomass; Nutrients; Forestal; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2097

Estudios anatómicos fisiológicos y nutrimentales de semillas de heliconias
Provedor de dados: 32
Autores: Benítez Domínguez, Lizeth.
Las heliconias son especies que desempeñan importantes funciones en los ecosistemas y que tienen un valor comercial alto debido a sus vistosas inflorescencias. Estas especies normalmente se reproducen de manera asexual y su producción se reduce a manejos tradicionales, por lo que existen pocos estudios de sus semillas y del manejo nutrimental de las plantas para elevar su producción. En esta investigación de hicieron estudios anatómicos, fisiológico y nutrimentales de cinco especies de heliconias: Heliconia bourgaeana, H. collinsiana, H. latispatha, H. psittacorum y H. rostrata. Las semillas de estas especies resultaron impermeables al agua. En H. collinsiana y H. latispatha los embriones se encontraron bien desarrollados y sin daños después de un año de...
Palavras-chave: Heliconiaceae; Embrión; Endospermo; Ácido abscísico; Nutrimentos; Heliconiaceae; Embryo; Endosperm; Abscisic acid; Nutrients; Maestría; Edafología.
Ano: 2010
URL: http://hdl.handle.net/10521/80

Deficiencias nutrimentales en huertos de guayabo y su relación con la incidencia de peca en fruto.
Provedor de dados: 32
Autores: Cardoso del Río, Israel.
Con el objetivo de identificar las deficiencias nutrimentales relacionadas con la incidencia de la peca de la guayaba en región oriente del estado de Michoacán, se realizó un muestreo de suelo y foliar el 8 de mayo de 2007 para la obtención de un diagnóstico preliminar para la posterior aplicación de tratamientos foliares que contrarrestaran posibles deficiencias relacionadas con los daños de la peca en fruto, en tres huertos de los municipios Zitácuaro, Juárez y Jungapeo. La aplicación de los tratamientos fue vía foliar, éstos fueron: 1) fertilización mineral, empleando la formulación NV3, consistente en 1.0, 1.0, 2.0, 2.0, 2.0, 0.03, 0.05, 0.02, 0.05 y 0.02 g L-1 de Urea, MgSO4, KNO3, CaNO3, KH2PO4, H3BO3, MnSO4 4H2O, CuSO4 5H2O, ZnSO4 7H2O y FeEDTA,...
Palavras-chave: Psidium guajava; Guava; Guayaba; Michoacán; Deficiencias nutrimentales; Nutrimientos; Nutrients; Nutrimental dynamics; Maestría; Edafología.
Ano: 2010
URL: http://hdl.handle.net/10521/197

Efecto de la condición ambiental y la fertilización en el preacondicionamiento de Pinus engelmannii CARR. en el vivero y su desempeño en campo.
Provedor de dados: 32
Autores: García Pérez, José Luis.
El preacondicionamiento de la planta se realiza durante la etapa final de vivero y tiene como propósito favorecer su lignificación para que sea capaz de tolerar el estrés hídrico, nutricional y mecánico en los sitios de plantación. Esto se logra mediante un manejo adecuado de prácticas culturales como la fertilización y los riegos, mientras se elimina el efecto invernadero las plantas se exponen a condiciones ambientales de temperatura, humedad relativa e intensidad de luz, semejantes a las presentes en el campo. Se evaluó el efecto de: a) cuatro condiciones ambientales (invernadero, intemperie, malla sombra y malla sombra más intemperie) y b) tres niveles de fertilización (sin fertilización, dosis baja y dosis alta) y la interacción de éstos durante el...
Palavras-chave: Pinus engelmannii; Calidad de planta; Fisiología; Morfología; Nutrimentos; Seedling quality; Physiology; Morphology; Nutrients; Forestal; Maestría; Condición ambiental.
Ano: 2014
URL: http://hdl.handle.net/10521/2334

Estudios anatómicos fisiológicos y nutrimentales de semillas de heliconias
Provedor de dados: 32
Autores: Benítez Domínguez, Lizeth.
Las heliconias son especies que desempeñan importantes funciones en los ecosistemas y que tienen un valor comercial alto debido a sus vistosas inflorescencias. Estas especies normalmente se reproducen de manera asexual y su producción se reduce a manejos tradicionales, por lo que existen pocos estudios de sus semillas y del manejo nutrimental de las plantas para elevar su producción. En esta investigación de hicieron estudios anatómicos, fisiológico y nutrimentales de cinco especies de heliconias: Heliconia bourgaeana, H. collinsiana, H. latispatha, H. psittacorum y H. rostrata. Las semillas de estas especies resultaron impermeables al agua. En H. collinsiana y H. latispatha los embriones se encontraron bien desarrollados y sin daños después de un año de...
Palavras-chave: Heliconiaceae; Embrión; Endospermo; Ácido abscísico; Nutrimentos; Heliconiaceae; Embryo; Endosperm; Abscisic acid; Nutrients; Maestría; Edafología.
Ano: 2010
URL: http://hdl.handle.net/10521/80

Chemical attributes of soil and dry mass accumulation of maize fertilized with cassava wastewater
Provedor de dados: 70
Autores: Magalhães,Adriana G.; Rolim,Mario M.; Duarte,Anamaria S.; Pedrosa,Elvira M. R.; Silva,Enio F. de F. e.
The aim of this study was to evaluate chemical attributes alterations of a clay-loam textured soil and dry mass accumulation of maize submitted to application of cassava wastewater doses in three assessment periods. The experiment was conducted under greenhouse using a completely randomized experimental design in a factorial 5 × 3, with four replicates. The analyzed factors of research were doses of cassava wastewater (0; 12.6; 25.2; 50.4; 75.6 m3 ha-1) andassessment periods (20, 40 and 52 days after germination). The following parameters were determined: electric conductivity of soil saturation extract, pH in water, content of available P, content of exchangeable K+, Ca2+, Mg2+ and Na+ of soil, dry mass of leaves and stem. The application of cassava...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residue; Starch; Nutrients; Organic fertilization; Zea mays.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300458

SIMULATION OF SODIUM AND POTASSIUM DYNAMICS BY THE HYDRUS 2D MODEL IN A HAPLIC PLANOSOL VIA RESIDUE WATER
Provedor de dados: 70
Autores: Andrade,Carolyne W. L. de; Montenegro,Suzana M. G. L.; Miranda,Jarbas H. de; Montenegro,Abelardo A. de A.; Assis,Fred M. C. V. de.
ABSTRACT The application of chemical substances to the soil together with little attention given to the possible environmental impacts, transformed the environment into a recipient of waste. The aim of this study was to simulate the movement of water and solutes (sodium and potassium together) using the STANMOD and HYDRUS-2D models in a typical Haplic Planosol under the application of wastewater via surface irrigation under different flow rates. The experiment was conducted in the laboratory by miscible displacement tests, first using columns with deformed soil under saturation and steady water flow conditions, at a rate of 11.7 cm3 min-1, to obtain transport parameters of sodium and potassium ions, and in the applied residual water, the values of 475 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Nutrients; Soil physical properties; Water reuse.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000600874

EXTRACTION CAPACITY OF GRASSES GROWN IN CONSTRUCTED WETLAND SYSTEMS USING DIFFERENT ARRANGEMENTS AND SUBSTRATES
Provedor de dados: 70
Autores: Saraiva,Claudety B.; Matos,Antonio T.; Matos,Mateus P. de.
ABSTRACT Constructed wetland systems have been used to treat different wastewater; among their essential components are the cultivated plant species and type of substrate used to fill them. The choice of plant species and type of substrate are important for the good system performance in wastewater treatment. This study aimed to evaluate the extraction capacity of Napier and Tifton 85 grasses when cultivated at different positions in horizontal subsurface flow constructed wetlands (HSSF-CWs) filled with different substrates in wastewater treatment from a bulk milk-cooling tank (MTWW). The experimental unit consisted of four HSSF-CWs, in which an average surface organic loading rate of 318 kg ha−1 d−1 of BOD5,20 was imposed and a hydraulic holding time of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Forage; Nutrients; Built wetlands.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500668

PERFORMANCE OF TIFTON 85 GRASS UNDER FERTIRRIGATION WITH SLAUGHTERHOUSE WASTEWATER
Provedor de dados: 70
Autores: Oliveira,Jacineumo F. de; Rodrigues,Fernando N.; Fia,Ronaldo; Vilela,Hévelyn S.; Mafra,Dayana C. B.
ABSTRACT: The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertilized with different wastewater doses of swine slaughterhouse. The experiment was conducted in the Environmental Engineering Center and Sanitary of UFLA/MG in PVC columns filled with Dark Red Latosol (Oxisol) and randomly distributed. The treatments applied with nitrogen based load (300 kg ha de N years−1) consisted of four doses of SW and AQT0 control at random. Three cuts were performed, at 60, 90 and 120 days after planting. The highest yields were 10.06, 16.82 and 20.39 t ha−1 in AQT0, AAT4 and AAT3 treatments, respectively. With the increase of nutrients by N rates and root development of Tifton 85 grass, we observed higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Productivity; Forage; Nutrients; Disposal; Agroindustrial wastewaters.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400790

Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
Provedor de dados: 72
Autores: Rabalais,Nancy N.
The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to...
Tipo: Journal article
Palavras-chave: Anoxia; Hypoxia; Eutrophication; Nutrients; Nitrogen.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015

MicroRNAs play critical roles during plant development and in response to abiotic stresses
Provedor de dados: 74
Autores: Lima,Júlio César de; Loss-Morais,Guilherme; Margis,Rogerio.
MicroRNAs (miRNAs) have been identified as key molecules in regulatory networks. The fine-tuning role of miRNAs in addition to the regulatory role of transcription factors has shown that molecular events during development are tightly regulated. In addition, several miRNAs play crucial roles in the response to abiotic stress induced by drought, salinity, low temperatures, and metals such as aluminium. Interestingly, several miRNAs have overlapping roles with regard to development, stress responses, and nutrient homeostasis. Moreover, in response to the same abiotic stresses, different expression patterns for some conserved miRNA families among different plant species revealed different metabolic adjustments. The use of deep sequencing technologies for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MiRNAs; Development; Abiotic stress; Nutrients; Deep sequencing.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600023

Effect of humus and soil substrates on production parameters and quality of organic strawberries
Provedor de dados: 75
Autores: Hoehne,Lucélia; Altmayer,Taciélen; Martini,Maira C; Finatto,Jordana; Brietzke,Débora T; Kuhn,Daniel; Schweizer,Ytan A; Vettorello,Gabriela; Cordeiro,Sabrina G; Ethur,Eduardo M; Freitas,Elisete M de; Severo Filho,Wolmar A.
ABSTRACT This study aims to verify the most suitable substrate formulation based on proportions of earthworm humus and soil to improve the quality of organic strawberries. Vermicomposting generated humus and strawberry seedlings were planted in different humus:soil ratios: (0:100; 20:80; 40:60; 60:40; 80:20 and 100:0, respectively). The proportional conditions were characterized after planting and after 60-day cultivation, plants were harvested, and chemical characterizations of the soil and plants were made. We verified that with an increase of humus content in the substrate, an increase in values of N, P, K, pH and organic matter in soil and dry and fresh mass in shoot area of the plants were noticed. In relation to fruits, pH, humidity and sodium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa; Húmus; Fertilizer; Nutrients.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100101

Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants
Provedor de dados: 75
Autores: Rattin,Jorge E.; Andriolo,Jerônimo L.; Witter,Márcio.
The nitrogen concentration in dry matter of the fifth leaf during growth of a greenhouse tomato crop was determined. Plants of hybrid Monte Carlo were grown in 4.5 L bags, using a commercial substrate, in a plant density of 3.3 plants m-2. A nutrient solution containing, in mmol L-1: KNO3, 4.0; K2SO4, 0.9; Ca(NO3)2, 3.75; KH2PO4, 1.5; MgSO4, 1.0; iron chelate 19. 10³, was used as reference. Microelements were added by a commercial mixture. The T3 treatment was equal to the reference nutrient solution, whereas in treatments T1, T2, T4 and T5 quantities of all nutrients from T3 were multiplied by 0.25, 0.50, 1.25 and 1.50, respectively. In each treatment, the volume of 1 L of nutrient solution was supplied to each plant once a week by fertigation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Nutrients; Mineral nutrition; Fertilization.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362002000400023

Rapid NPK diagnosis in tomato using petiole sap analysis with the DRIS method
Provedor de dados: 75
Autores: Ávila-Juárez,Luciano; Rodríguez-Ruiz,Mario A.
ABSTRACT One of the factors determining success in tomato production is plant nutrition. The diagnosis and recommendation integrated system (DRIS) is a tool used to obtain fertilizer recommendations. The objective of this study was to determine DRIS indices using petiole sap analysis (PSA) and compare them with those obtained using leaf analysis in two tomato cultivars grown under greenhouse conditions. A complete randomized design with eight treatments and 60 plants per experimental unit was used. To determine whether employing PSA with the DRIS methodology can provide a reliable diagnosis of fertilization, doses of some elements, such as N, P, or K, were reduced by 30% and supplied to two tomato cultivars, namely, Cid and Moctezuma. The indices for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Petiole extract; Nutritional balance; Nutrients.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000300306

Potassium sources and doses in coriander fruit production and essential oil content
Provedor de dados: 75
Autores: Freitas,Marta Simone Mendonça; Gonçalves,Ygor de Souza; Lima,Thaísa Capato; Santos,Paulo Cesar dos; Peçanha,Diego Alves; Vieira,Marlene Evangelista; Carvalho,Almy Júnior Cordeiro de; Vieira,Ivo José Curcino.
ABSTRACT Potassium (K) is one of the most required agricultural crop macronutrients, with potassium chloride being the most applied source. However, this fertilizer is not recommended for several crops due to its high chlorine content, promoting final product quality losses, thus being replaced by potassium sulphate. The aim of the present study was to evaluate the production and macronutrient, essential oil and linalool contents of coriander fruits submitted to different potassium sources and doses. The research was performed in a greenhouse, in plastic 46 kg boxes applying a mixture of soil and sand as substrate. The experimental design was of randomized blocks, applying a 2x4 factorial arrangement, with two potassium sources (potassium chloride and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coriandrum sativum; Nutrients; Secondary metabolism; Linalool.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000300268

Chemical composition, carotenoids, vitamins and minerals in wild mustard collected in native areas
Provedor de dados: 75
Autores: Paula Filho,Galdino X; Barreira,Tibério F; Santos,Ricardo HS; Priore,Silvia E; Lucia,Ceres M Della; Pinheiro-Sant’Ana,Helena M.
ABSTRACT Wild mustard plant (Sinapis arvensis), Brassicaceae, is a wild vegetable found in forest area, domestic orchards and it is consumed by rural population. This study aimed to evaluate chemical composition (moisture, total dietary fiber, lipids, proteins, ash, carbohydrates and total energetic value), concentration of carotenoids, vitamins (C and E) and minerals (K, Ca, Mg, Cu, Fe, Zn, Mn, Na, Cr, Se and Mo) and the contribution by this vegetable to the recommendations of daily consumption of nutrients for adult individuals. Concentrations of provitamin A (252.21 RAE/100 g), Se (0.04 mg/100 g) and Fe (5.91 mg/100 g) stood out, in which this vegetable was considered as an excellent source for these nutrients. In addition, wild mustard was considered a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sinapis arvensis; Unconventional vegetables; Nutritional value; Nutrients.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100059

Сезонная изменчивость скорости роста фитопланктона             в прибрежных водах Чёрного моря (район Севастополя).
Provedor de dados: 13
Autores: Стельмах, Л. В.; Куфтаркова, Е. А.; Бабич, И. И.
На основе данных, полученных на трёх станциях в прибрежных поверхностных водах Чёрного моря (в районе Севастополя) в 2006 – 2007 гг., представлена сезонная динамика удельной скорости роста фитопланктонного сообщества. В течение года этот показатель изменялся приблизительно на порядок. Максимальные значения (2.00 – 2.70 сутки-1) наблюдались в периоды весеннего и осеннего «цветения» воды, вызванного диатомовой водорослью Chaetoceros socialis. Минимальные величины (0.06 – 0.10 сутки-1) отмечены зимой, когда в планктоне доминировали два вида диатомовых водорослей Sceletonema costatum и C. socialis. Получены количественные зависимости между концентрацией нитратов и кремния, с одной стороны, и удельной скоростью роста фитопланктона, с другой. Основным фактором,...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Скорость роста; Хлорофилл a; Биогенные вещества; Чёрное море; Phytoplankton; Growth rate; Chlorophyll a; Nutrients; Black Sea; Фітопланктон; Швидкість росту; Хлорофіл a; Біогенні сполуки; Чорне море.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/843

Сезонная изменчивость отношения органического углерода к хлорофиллу «а» и  факторы, ее определяющие в фитопланктоне прибрежных вод Черного моря
Provedor de dados: 13
Autores: Стельмах, Л. В.; Бабич, И. И.
На основе данных, полученных на пяти станциях в прибрежных поверхностных водах Черного моря (в районе Севастополя) в 2002 – 2003 гг., представлена сезонная динамика отношения С:хл “a” в нано- и микрофитопланктоне. В течение года этот показатель изменялся приблизительно на порядок. Наибольшие значения отношения (400 – 500) были получены в летний период (в июле), когда интенсивность солнечной радиации достигала максимума, а концентрация нитратов снижалась до аналитического ноля. Наименьшие величины (30 – 50) отмечены зимой при минимальных интенсивностях солнечной радиации и  относительно высоких (4 – 25 мкМ) концентрациях нитратов. Представлены регрессионные зависимости, отражающие комбинированное действие света, температуры, биогенных веществ и видового...
Tipo: Journal Contribution
Palavras-chave: Хлорофилл "a"; Органический углерод; Фитопланктон; Свет; Биогенные вещества; Черное море; Сhlorophyll "a"; Phytoplankton; Organic carbon; Light; Nutrients; Black Sea Phytoplankton Organic carbon Light Nutrients (mineral) Light Phytoplankton http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/315

Сезонные изменения скорости роста и лимитирование фитопланктона питательными веществами в прибрежных водах Черного моря в районе Севастополя
Provedor de dados: 13
Autores: Стельмах, Л. В.; Губанов, В. И.; Бабич, И. И.
Исследована сезонная динамика скорости роста микро- и нанофитопланктона и ее зависимость от концентрации основных биогенных веществ в среде в прибрежных поверхностных водах Черного моря  в районе Севастополя. Показано, что скорость роста фитопланктона лимитируется соединениями азота в течение большей части  года. В холодный период (ноябрь – апрель), когда количество нитратов в воде было сравнительно высоким (1 - 10 мкМ), скорость роста микро- и нанофитопланктона определялась их концентрацией в соответствии с уравнением Михаэлиса-Ментен. В теплое время (май – октябрь) при более низких концентрациях нитратов в среде (в основном  менее 1мкМ) скорость роста водорослей связана гиперболической зависимостью с  содержанием аммония.  Степень азотного лимитирования...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Лимитирование; Биогенные вещества; Черное море; Phytoplankton; Limitation; Nutrients; Black Sea Nutrients (mineral) Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/135

Light absorbtion and maximum yield of photosynthesis during autumn phytoplankton bloom in the western Black Sea.
Provedor de dados: 13
Autores: Churilova, T. Ya.; Finenko, Z. Z.; Turgul, S.
In the frame of GEF/UNDP Black Sea Ecosystem Recovery Project the effect of nutrient availability on phytoplankton light absorption and maximum quantum yield of carbon fixation (фmax) has been investigated. It has been found out that chlorophyll a concentration (Chl a) varied from 0.3 to 10 mg m-3 increasing from deep-water region to shelf waters. At the shallow stations, where upper mixed layer spread deeper the bottom of euphotic zone, the homogenous pigment distribution was observed. In the deep-water region the Chl a profiles showed the presence of a deep Chl a maximum (DCM) below a seasonal density cline. The functional characteristics of phytoplankton showed depth-dependent variation. The phytoplankton from DCM was characterized 20 % lower values of...
Tipo: Journal Contribution
Palavras-chave: Chlorophyll a; Phytoplankton; Light absorption; Maximum quantum yield; Nutrients; Хлорофилл a; Фитопланктон; Поглощение света; Максимальный квантовый выход; Биогенные элементы; Хлорофіл а; Фітопланктон; Поглинання світла; Максимальний квантовий вихід; Біогенні елементи.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/823

Вертикальное распределение хлорофилла и флуоресценции в Черном море
Provedor de dados: 13
Autores: Финенко, З. З.; Чурилова, Т. Я.; Ли, Р. И.
На основании обобщения большого количества данных, полученных в результате исследований многих ав­торов, установлены временные и региональные изменения вертикального распределения концентрации хло­рофилла, флуоресценции. В холодный период (с декабря по март), когда вертикальное перемешивание по­верхностного слоя происходит достаточно активно, концентрация хлорофилла в глубоководных районах мо­ря распределена относительно равномерно в слое до 40 - 50 м. В теплый период (с мая по октябрь), после установления температурной стратификации в верхнем слое, преобладают профили с одним максимумом хлорофилла. Глубина расположения максимума хлорофилла меняется в широких пределах и зависит от его концентрации. Увеличение содержания хлорофилла в планктоне приводит к...
Tipo: Journal Contribution
Palavras-chave: Черное море; Флуоресценция; Хлорофилл а; Фитопланктон; Биогенные вещества; Свет; The Black Sea; Chlorophyll a; Fluorescence; Phytoplankton; Nutrients; Irradiance Irradiance Nutrients (mineral) Phytoplankton Fluorescence Chlorophylls Fluorescence Phytoplankton Chlorophylls http://aims.fao.org/aos/agrovoc/c_10935 http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/189

Retorno ao solo de macronutrientes de serrapilheira em povoamentos de pinus no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
bitstream/CPAC-2009/24342/1/p2002_65.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Pinus caribea; Organic mattter.; Cerrado; Fertilidade do Solo; Matéria Orgânica; Nutriente; Serapilheira.; Nutrients; Soil fertility.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567645

Retorno ao solo de nutrientes de serrapilheira de Eucalyptus cloeziana no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
RESUMO: O objetivo deste trabalho foi comparar procedências de Eucalyptus cloeziana quanto à queda de serrapilheira e aos nutrientes potencialmente retornáveis ao solo por essa via no Cerrado, em Planaltina-DF. O experimento foi implantado em um Latossolo Vermelho, argiloso, distrófico a uma altitude de 1000 m. As procedências avaliadas foram: 11008 de Coominglah; 11666 de Cooktown e 11949 de Fraser Island, todas de Queensland, Austrália. No centro das parcelas de 7x7 plantas colocaram-se coletores de 1x1m, ao nível do solo. De setembro de 1995 a agosto de 2000, mensalmente, o material foi recolhido e separado em folhas, galhos, frutos e casca e determinando a matéria seca. Antes da separação retirava-se uma amostra do material para determinação dos teores...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Cycling.; Carbono; Cerrado; Eucalipto; Fertilidade do Solo; Matéria Orgânica; Nutriente; Serapilheira.; Reflorestamento; Carbon; Organic matter; Reforestation; Nutrients; Soil fertility.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567965

Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 45 (Manaus-AM).
This project has by objective the quantification of water and nutrient fluxes in an experimental plantation, which is composed of different monoculture and polyculture systems with mainly perennial crops, as well as in primary and secondary forest at EMBRAPA-CPAA (Manaus, AM, Brasil). The flux measurements are expected to provide information about the efficiency with which the different land use systems exploit the available resources (water, nutrients) on the infertile soils of the area and minimize unproductive losses, e.g., through leaching. Efficient resource utilization is seem as a procondition of sustainable land use on this site.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Agrofloresta; Brasil; Amazonas; Manaus; Tropical rain forest; Água; Cultivo Multiplo; Floresta Tropical Úmida; Nutriente; Solo; Uso da Terra; Agroforestry; Land use; Multiple cropping; Nutrients; Soil; Water.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/668143

Efeito do reflorestamento com diferentes espécies sobre os atributos químicos em solo de cerrado.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
RESUMO: O objetivo desse trabalho foi avaliar o efeito do reflorestamento com eucalipto (Eucalyptus camaldulensis), carvoeiro (Sclerolobium paniculatum) , pinus (Pinus tecunumanii) e baru (Dipteryx alata) sobre os teores de nutrientes e de carbono orgânico do solo em comparação com uma área sob vegetação de Cerrado. Foram coletadas amostras de solo nas camadas 0 cm -5 cm, 5 cm - 10 cm, 10 cm - 20 cm, 20 cm - 30 cm, 30 cm - 40 cm e 40 cm - 60 cm, em um povoamento de baru plantado em 1987, um de carvoeiro plantado em 1985, um de pinus plantado em 1984, um de eucalipto plantado em 1983 e em uma área adjacente com vegetação nativa de Cerrado. Cada amostra foi composta por dez subamostras por parcela e por profundidade, coletadas entre as linhas. Os atributos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Carvoeiro; Baru; Planta nativa; Indigenous organisms.; Cerrado; Dipteryx Alata; Eucalipto; Eucalyptus Camaldulensis; Nutriente; Reflorestamento; Sclerolobium Paniculatum; Solo.; Pinus; Pinus tecunumanii; Nutrients; Reforestation; Soil.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570259

Fertirrigação.
Provedor de dados: 14
Autores: PINTO, J. M.; SILVA, D. J.; BORGES, A. L.; COELHO, E. F.; FEITOSA FILHO, J. C.
Vantagens e limitações da fertirrigação; fatores relacionados ao tipo de solo e à qualidade de água de irrigação, aos fertilizantes utilizados na fertirrigação; compatibilidade entre os fertilizantes utilizados na fertirrigação; perigo de corrosão; equipamentos para fertirrigação; exigências nutricionais da mangueira; manejo da fertirrigação; automação e medidas de segurança na fertirrigação.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Nutrientes; Fertilizer applications; Management; Adubação; Fertirrigação; Manga; Manejo; Fertigation; Mangoes; Nutrients.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/144914

Suplementos químicos agrícolas na cultura do feijoeiro.
Provedor de dados: 14
Autores: GUIMARÃES, C. M.; STONE, L. F.; SARMENTO, P. H. L.
Objetivou-se determinar o efeito da aplicação de suplementos químicos agrícolas no feijoeiro, cultivar BRS Estilo, em Sistema Plantio Direto (SPD). Foram conduzidos dois experimentos, no inverno de 2018 e de 2019, na Embrapa Arroz e Feijão, em Santo Antônio de Goiás, GO, avaliando os efeitos dos seguintes tratamentos: 1) Gesso agrícola, 200 kg ha-1, na semeadura; 2) Boro, 1 kg ha-1, na semeadura; 3) MAP via foliar, 1,5 kg ha-1, em ambos os estádios, V4 e R5; 4) Ca via foliar, 680 g ha-1, em ambos os estádios, V4 e R5; 5) Boro via foliar, 100 g ha-1, também em ambos os estádios, V4 e R5; e 6) bioestimulante, 0,5 L ha-1, em V4. Usou-se o delineamento de blocos ao acaso com quatro repetições e a adubação conforme a análise química do solo e os tratos...
Tipo: Folhetos
Palavras-chave: Selo ODS 2; Objetivo de desenvolvimento sustentável; Feijão; Phaseolus Vulgaris; Nutriente; Método de Aplicação; Estimulante de Crescimento Vegetal; Cálcio; Ácido Giberélico; Ácido Indolbutírico; Produtividade; Beans; Calcium; Kinetin; Gibberellic acid; Indole butyric acid; Yields; Nutrients.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1150262

Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 45.
This second annual report of the project summarizes the activities between January and December 1996. During this year, the project left the preparotory stage of purchasing, importing and installing equipment and entered into the stage of routine data collection and analysis.The report is divided into two parts. In the main part, the project team is presented and its acitivities during the year 1996 are briefly summarized. The annexes give detailed accounts of selected research acitivities of the project. Despite numerous problems, all project activities were in principle successful, and there were no major changes to the time plan of the project. The root distribution studies were completed. Significant progress was made in soil physical studies, soil...
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Area abandonada; Agrofloresta; Fluxo; Brasil; Amazonas; Tropical rain forest; Agroforest; Fluxes; Analysis; Água; Análise; Conservação do Solo; Floresta Tropical Úmida; Nutriente; Environmental degradation; Nutrients; Soil conservation; Water.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/667417

Efeito de procedências de Eucalyptus camaldulensis sobre os teores de nutrientes e de carbono orgânico do solo no cerrado.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.; GOMES, A. C.
RESUMO: O objetivo deste trabalho foi avaliar o efeito do plantio de eucalipto nos teores de nutrientes e de carbono orgânico do solo em comparação com uma área virgem de Cerrado. Foram coletadas e analisadas amostras de solo até 1 m de profundidade em um experimento de procedências de Eucalyptus camaldulensis e em uma área adjacente de Cerrado, na mesma posição topográfica, em Planaltina, Distrito Federal. O solo é Latossolo Vermelho, argiloso (55% de argila, 23% de silte, 2% de areia grossa e 20% de areia fina) e distrófico. Na ocasião do plantio, o eucalipto foi adubado com 40 g de sulfato de amônio, 60 g de superfosfato triplo, 20% decloreto de potássio, 2 g de sulfato de zinco, 3 g de bórax e 500 g de calcário dolomítico por cova. As procedências...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Cycling.; Eucalipto; Nutriente; Reflorestamento; Solo.; Eucalyptus; Nutrients; Reforestation; Soil.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569408

Retorno, ao solo, de nutrientes de serrapilheira de pinus no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK. D. V. S.
bitstream/CPAC-2009/24656/1/bolpd_75.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Pinus caribea; Carbono organico; Cycling.; Cerrado; Fertilidade do Solo; Matéria Orgânica; Nutriente; Reflorestamento; Serapilheira.; Carbon; Nutrients; Organic matter; Reforestation; Soil fertility.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559118

Efeitos de matéria orgânica com combinações de nutrientes químicos na produção de massa foliar em plantas de crajiru (Arrabidaea chica (H. B. K.) Verlot).
Provedor de dados: 14
Autores: SÁ SOBRINHO, A. F. de.
Estabelecimentos de praticas fitotecnicas para eficientizar o cultivo do crajiru em Manaus (AM), e fornecimento de indicacoes agricolas para melhoria do nivel de qualidade dos produtos fitoterapicos. Apesar de os resultados preliminares evidenciarem boa fertilidade do solo e de nao haver diferenca significativa entre os tratamentos, foi observado que o peso fresco das folhas de crajiru apresentou uma tendencia de aumento com a aplicacao da ureia associada aos demais fertilizantes, sugerindo que as aplicacoes de Cal, P e K desequilibraram a absorcao limitando o desempenho da planta.
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Arrabidaea chica; Crajiru; Brasil; Amazonas; Manaus; Fertilizers application; Production.; Adubação; Adubo Orgânico; Folha; Nutriente; Produção.; Leaves; Organic fertilizers.; Nutrients.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/666496

Retorno ao solo de macronutrientes de serrapilheira em povoamentos de Eucalyptus camaldulensis no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
bitstream/CPAC-2009/25284/1/p2004_13.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Cerrado; Eucalipto; Fertilidade do Solo; Nutriente; Reflorestamento; Serapilheira.; Eucalyptus; Nutrients; Reforestation; Soil fertility.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568283

Produção de "litter" e seu conteúdo de nutrientes em floresta primária e capoeira da Amazônia Oriental.
Provedor de dados: 14
Autores: DANTAS, M.
bitstream/item/57922/1/Doc40-p147-162.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Produção de liteira; Produtividade primária; Capitão Poço; Pará; Brasil; Plant soil relations.; Ecossistema; Matéria Orgânica; Nutriente; Relação Solo-Planta.; Amazonia; Forest litter; Ecosystems; Organic matter; Primary productivity.; Nutrients.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394726

Reciclagem de nutrientes por leguminosas cultivadas no periodo da seca em dois solos de cerrado.
Provedor de dados: 14
Autores: BURLE, M. L.; BOWEN, W. T.; PEREIRA, J.; SUHET, A. R.; RESCK, D. V. S.; PERES, J. R. R.
bitstream/item/102187/1/pesq-50.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Planta Leguminosa; Cultivo; Epoca seca; Latossolo Vermelho-amarelo; Latossolo Vermelho-escuro; Cultivation; Dark-red latosol; Red-yellow latosol.; Cerrado; Leguminosae; Nutriente; Reciclagem; Solo.; Dry season; Recycling.; Nutrients.
Ano: 1990
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549389

Perdas de solo, agua e elementos quimicos no ciclo da soja, aplicando-se chuva simulada.
Provedor de dados: 14
Autores: RESCK, D. V. S.
bitstream/item/98702/1/bolpd-05.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Losses; Simulation.; Água; Chuva; Cerrado; Glycine Max; Perda; Nutriente; Soja; Simulação; Solo.; Nutrients; Rain; Soybeans; Soil; Water.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/548447

Retorno ao solo de nutrientes de serrapilheira de Eucalyptus camaldulensis no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
RESUMO: O objetivo deste trabalho foi comparar procendências de Eucalyptus camaldulensis quanto à queda de serrapilheira e o retorno de nutrientes ao solo por essa via, no cerrado, em Planaltina-DF. O experimento foi em uma área localizada a 1000 m de altitude.O solo é Latossolo Vermelho Ditrófico típico textura argilosa. As argilosa. As procedências avaliadas foram: 10911 de Emu Creek, Queensland; 9856 de Agnew Road, West Autralian e 10557 de Kimberly Area, West Australian. No centro das parcelas de 7 x 7 plantas, colocaram-se coletores de 1,0 x 1,0 m, ao nível do solo. De setembro de 1995 a agosto de 2000, mensalmente, o material foi recolhido e separado em folhas, galhos, frutos cascas e determinada matéria seca. Antes da separação, retirava-se uma...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Cycling.; Carbono; Eucalipto; Fertilidade do Solo; Matéria Orgânica; Nutriente; Serapilheira.; Reflorestamento; Carbon; Organic matter; Reforestation; Nutrients; Soil fertility.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568115

Projeto Tipitamba: produzir sem queimar.
Provedor de dados: 14
Autores: EMBRAPA AMAZÔNIA ORIENTAL.
O fogo e uma das mais antigas tecnologias incorporadas ao sistema de produção e e utilizado ate os dias atuais por facilitar a limpeza da área e por tornar os nutrientes da vegetação prontamente disponíveis para a fase de cultivo atraves das cinzas, mas a queimada afeta a atmosfera aumentando a quantidade de gás carbonico, com possibilidade de afetar o processo de formação de nuvens de chuva, por isso a presente pesquisa traz informações para o preparo da área para o plantio, sem o uso do fogo.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Capoeira; Nutriente; Queimada; Vegetação.; Burning; Nutrients; Vegetation.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1072158

Exigências nutricionais e adubação do milho safrinha.
Provedor de dados: 14
Autores: COELHO, A. M.
bitstream/item/94712/1/Exigencias-nutricionais.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Zea mays; Nutriente; Nutrição vegetal; Nutrients; Plant nutrition; Fertilizer application.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/974963

Determination of macro and micronutrients in plants using the Agilent 4200 MP AES.
Provedor de dados: 14
Autores: LIBERATO, C. G.; BARROS, J. A. V. de A.; VIRGILIO, A.; MACHADO, R. C.; NOGUEIRA, A. R. de A.; NOBREGA, J. de A.; SCHIAVO, D.
The determination of macro and micronutrients in plant tissues is an important measure used to analyze plant nutritional status and to evaluate the possible need for fertilizer supplementation.
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Fertilizer supplementation.; Nutrients; Technology.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1079521

Cobertura de solos em pomares de maracujazeiro.
Provedor de dados: 14
Autores: ANDRADE, L. R. M. de; ICUMA, I. M.; JUNQUEIRA, N. T. V.; KARIA, C. T.; CARVALHO, A. M. de; VIVALDI, L. J.
RESUMO: Este trabalho teve como objetivo avaliar a adequação das espécies leguminosas Crotalaria spectabilis, guandu-anão, feijão-de-porco e amendoim forrageiro ao sistema de plantio em consórcio com maracujá amarelo (Passiflora edulis f. flavicarpa Deg.). À exceção do amendoim forrageiro, cujo cescimento inicial é lento, as espécies apresentaram boa taxa de cobertura do solo nos primeiros 30 dias de seu plantio. As leguminosas influenciaram a densidade da fauna de insetos visitantes, sendo os grupos Diptera e Hymenoptera os mais freqüentes. Nas plantas de maracujá, o nematóide-de-galha Meloidogyne ocorreu principalmente nas parcelas com feijão-de-porco, mas não foram observados efeitos negativos na produção dos frutos. A presença das leguminosas entre as...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Cover plants; Quality.; Adubo Verde; Cobertura do Solo; Leguminosa; Maracujá; Nutrição; Passiflora Edulis; Planta de Cobertura; Qualidade; Solo.; Green manures; Passion fruits; Nutrients; Soil.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559908

Cultivo orgânico do café: recomendações técnicas.
Provedor de dados: 14
Autores: RICCI, M. dos S. F.; ARAÚJO, M. do C. F.; FRANCH, C. M. de C.
Agricultura alternativa e agricultura convencional. Fundamentos da agricultura orgânica. A cafeicultura, segundo os princípios da agricultura orgânica. Escolha da espécie e das cultivares adequadas. Formação das mudas. Preparo da área de plantio. Correção do solo. Fontes de matéria orgânica e de nutrientes. Estercos. Compostagem. Vermicompostagem. Cobertura morta do solo. Cobertura viva do solo e adubos verdes. Biofertilizantes. Espaçamento e densidade de plantio. Controle alternativo de fitopatógenos e pragas do cafeeiro. Controle de fitopatógenos. Controle de pragas, ácaros e nematóides. Controle de plantas invasoras. Arborização ou sombreamento de cafezais. Conversão de lavouras convencionais em orgânicas. Certificação e comercialização de café orgânico.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Agricultura natural; Vermicompostagem; Cobertura viva; Fitopatologia; Planta invasora; Coffee; Alternative agriculture; Planting density; Spacing; Cultural practices; Cultural methods; Phytopathology; Plant diseases; Nematodes; Revegetation.; Agricultura Alternativa; Ácaro; Adubo Orgânico; Agricultura Orgânica; Biofertilizante; Arborização; Café; Compostagem; Cobertura Morta; Comercialização; Densidade de Plantio; Doença de Planta; Esterco; Erva Daninha; Nematóide; Matéria Orgânica; Nutriente; Praga; Pratica Cultural; Solo; Sombreamento.; Acarus; Lumbricidae; Nematoda; Composting; Biofertilizers; Organic fertilizers; Organic matter; Plant pathology; Mulching; Nutrients; Soil; Vermicomposting.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/622689

Estádios fenológicos e marcha de absorção de nutrientes da soja.
Provedor de dados: 14
Autores: OLIVEIRA JUNIOR, A. de; CASTRO, C. de; PEREIRA, L. R.; DOMINGOS, C. da S.
Estádios fenológicos: fase reprodutiva (crescimento indeterminado e determinado); fase vegetativa. Marcha de absorção de nutrientes da soja: macronutrientes (nitrogênio, cálcio, fósforo, magnésio, potássio e enxofre) e micronutrientes (Boro, manganês, cobre, zinco). Extração e exportação de macro e micronutrientes em diferentes cultivares de soja: BRS 184, SYN 1059, DM 6563 - Intacta RR2 PRO (tm).
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Soja; Absorção de nutrientes; Fisiologia nutricional; Soybeans; Plant physiology; Nutrients.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1047123

Diagnóstico da fertilidade do solo em áreas de sequeiro de agricultores familiares em municípios do Sertão dos Inhamuns, Ceará.
Provedor de dados: 14
Autores: SOUZA, H. A. de; CAVALCANTE, A. C. R.; TONUCCI, R. G.; POMPEU, R. C. F. F.; SOUZA, M. C. M. R. de.
bitstream/item/126439/1/cnpc-2015-Cot-145.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Semiárido; Brasil; Região Nordeste; Análise do solo; Fertilidade do solo; Matéria orgânica; Nutriente; Agricultura familiar; Comunidade rural; Caatinga; Soil analysis; Soil fertility; Organic matter; Nutrients; Rural communities; Semiarid soils; Brazil.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019645

Balanço de macronutrientes de cultivares de sorgo sacarino e biomassa em áreas de reforma de canavial.
Provedor de dados: 14
Autores: SANTOS, M. de S. dos; ANDRADE, C. A. de; SANTOS, F. C. dos; MAY, A.
Este trabalho teve como objetivo avaliar as diferenças no balanço de macronutrientes de diferentes cultivares de sorgo em solos de reforma de canavial, sob sistema de cultivo convencional e plantio direto. Foram realizados dois ensaios. O primeiro com delineamento experimental em blocos ao acaso, com seis cultivares de sorgo (CR 1339, CR 1349, CR 1352, CR 1342, BRS 716, e CMSXS 647). As cultivares CR 1352, CR 1342, CR 1349, CR 1339 receberam adubações com NPK, 8-28-16, no plantio e uma adubação de cobertura com NPK, 20-00-20 e as cultivares BRS 716 e CMSXS 647 receberam uma adubação no sulco do adubo Polybren, NPK 40-00-00. O segundo com o delineamento experimental em blocos casualizados em faixas, em arranjo fatorial 2x2, com três repetições, com duas...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fluxo de nutriente; Sorghum bicolor; Fertilidade do solo; Variedade; Nutriente; Soil fertility; Varieties; Nutrients.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1080165

Comportamento fisiológico e produtivo do milho (Zea mays L.) em sistema agroflorestal.
Provedor de dados: 14
Autores: MENDES, M. M. de S.; CAVALCANTE, A. C. R.; FERNANDES, F. E. P.; LACERDA, C. F. de; OLIVEIRA, T. S. de.
Os objetivos deste trabalho foram, assim, avaliar a produtividade e o teor de macro e micronutrientes do milho, determinar a zona de absorção de água e verificar a existência de competição entre milho e uma espécie arbórea dominante em um sistema agrosilvipastoril experimental no semiárido cearense.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Variedade catingueiro; Cordia oncocalyx; Pau Branco; Sistema agrossilvipastoril; Raleamento; Rebaixamento; Sistema agroflorestal; SAFs; Produtividade da planta; Shading.; Maize; Nutrição vegetal; Nutriente; Milho; Sombreamento; Zea Mays.; Nutrients; Nutrition; Plant nutrition.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1004583

Efeito de procedências de Eucalyptus cloeziana sobre os teores de nutrientes e de carbono orgânico em solo de cerrado.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.; GOMES, A. C.
RESUMO: O objetivo deste trabalho foi avaliar o efeito do plantio de Euca/yptus cloeziana sobre os teores de nutrientes e de carbono orgânico no solo em comparação com uma área virgem de Cerrado. Foram coletadas e analisadas amostras de solo até 1 m de profundidade em um experimento de procedências de Euca/yptus cloeziana e em uma área adjacente com vegetação de Cerrado, na mesma posição topográfica, em Planaltina, Distrito Federal. O solo é latossolo Vermelho, argiloso (55% de argila, 23% de silte, 2% de areia grossa e 20% de areia final e distrófico. Na ocasião do plantio, o eucalipto foi adubado com 40 g de sulfato de amônio, 60 g de superfosfato triplo, 20 g de cloreto de potássio, 2 g de sulfato de zinco, 3 g de bórax e 500 g de calcário dolomítico...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Eucalypthus; Cycling.; Eucalipto; Nutriente; Reflorestamento; Solo.; Nutrients; Reforestation; Soil.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570341

Nutrient leaching in mixed tree cropping systems.
Provedor de dados: 14
Autores: RENCK, A.; LEHMANN, Y.; TEIXEIRA, W.; HUWE, B.; ZECH, W.
Study on the leaching losses of applied 15N tagged fertilizer during one rainy season, in Manaus-AM (Brasil).
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Agrofloresta; Urucu; Brasil; Amazonas; Manaus; Bactris Gasipaes; Bertholletia Excelsa; Bixa Orellana; Castanha do Para; Cultivo Multiplo; Cupuaçu; Fertilidade do Solo; Floresta Tropical Úmida; Nutriente; Pueraria Phaseoloides; Pupunha; Theobroma Grandiflorum; Pueraria; Agroforestry; Fruit trees; Multiple cropping; Nutrients; Soil fertility; Tropical rain forests.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669436

Disponibilização de K de rochas silicáticas para plantas de soja inoculadas com fungos micorrízicos arbusculares (FMA).
Provedor de dados: 14
Autores: ANDRADE, L. R. M. de; FALEIRO, A. S. G.; SANTOS SOBRINHO, D. A.; NASCIMENTO, M. T. DO; SOUZA, A. L. DE.
bitstream/item/75813/1/bolpd-303.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fungo micorrízico arbuscular; Nutrientes; Arbuscular mycorrhizal fungus.; Rizosfera; Soja.; Nutrients; Soybeans.; Rhizosphere.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/931541

Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 45 (Manaus-AM).
This is the third annual report of the project summarizing the results of 1997. The results of the biomass determination and nutrient uptake are included which were conducted during 1996/97. First results from stand hydrology (stemflow, throughfall) and soil nitrogen dynamics are incorporated. The report is devided into two parts. In the main part, the project team is presented and is activities throughout the year 1997 are briefly summarized. The annexes give detailed information on selected research activities of the project. The research programme could be conducted according to the schedule outlined in previous report. This detailed and integrated analyses of the soil nutrient and water dynamics is yet to be done. This will involve mathematical...
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Água; Balanço Hídrico; Biomassa; Floresta Tropical Úmida; Nutriente; Solo; Transporte de Nutriente; Uso da Terra; Biomass; Land use; Nutrient uptake; Nutrients; Soil; Water; Water balance.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/667941

Monitoramento da reciclagem de nutrientes em sistemas de cultivo agrossilvopastoris.
Provedor de dados: 14
Autores: BARRETO, A. C.; CARVALHO FILHO, O. M. de.
bitstream/item/45384/1/PA-33-1997.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Monitoramento; Cultivation; System.; Agrossilvicultura; Nutriente; Reciclagem; Sistema de Cultivo.; Agroforestry; Monitoring; Nutrients; Recycling.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131590

Compilação dos trabalhos apresentados.
Provedor de dados: 14
Autores: CURSO SOBRE SUPLEMENTAÇÃO MINERAL EM BOVINOS, 3., 2000. Campo Grande, MS.
Importância da suplementação mineral para bovinos de corte. Estratégia de suplementação mineral de bovinos de corte. Calculo de misturas minerais para bovinos. Alguns aspectos da adubação de pastagens tropicais em relação a suplementação mineral. Uso de promotores de crescimento na dieta de bovinos de corte. Suplementação de bovinos em pastejo. Elementos minerais quelatados em suplementos para bovinos de corte. Fósforo suplementar para bovinos de corte.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bovino de corte; Suplementação mineral; Estimulantes de crescimento; Quelato; Supplements; Rations; Growth promoters; Fertilization; Brazilian savannas.; Adubação; Cálculo de Ração; Cerrado; Fósforo; Mistura Mineral; Mineral; Nutrição; Pastagem.; Chelating agents; Beef cattle; Nutrition; Nutrients; Pastures; Phosphorus.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/324274

Avaliação de uma rocha ígnea como corretivo de acidez e disponibilização de nutrientes para as plantas.
Provedor de dados: 14
Autores: ANDRADE, L. R. M. de; MARTINS, E. de S.; MENDES, I. de C.
RESUMO: O objetivo deste trabalho foi avaliar o potencial da rocha fresca carbonatito, proveniente da mina de fosfato localizada em Catalão - GO, como um possível fonte de insumos para a agricultura. O ensaio foi conduzido no campo, com o objetivo de avaliar o potencial de carbonatito como fonte de: (a) P; e, (b) K, para uma pastagem de Brachiaria ruziziensis. Foram realizados três cortes (abril/2000, fevereiro e maio/2001) das plantas e amostragem de solo e do tecido para análises químicas. Os resultados obtidos aos 560 dias depois da aplicação do carbonatito (CBT) demonstram que a maior produção de matéria seca (MS) foi atingida com a aplicação de 200 kg P2O5 / ha ) na forma solúvel. Não houve efeitos significativos do CBT como fonte de P na produção de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: PVGSOL200; Correcao do solo; Rock.; Acidez do Solo; Calcário; Corretivo; Fósforo; Magnesito; Insumo; Nutriente; Pastagem; Potássio; Rocha; Solo.; Farm inputs; Calcite; Liming; Phosphorus; Nutrients; Pastures; Potassium; Soil pH.; Soil amendments.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/563943

Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 45/2.
In this study, we present the effects of different fruit and timber tree species in a multistrata agroforestry system in comparison to secondary vegetation and primary forest sites on inorganic and organic P pools of a Ferralsol in the Amazon basin. The S pools were also assessed, but could not be presented here due to the length of this contribution.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Agrofloresta; Brasil; Tropical rain forest; Água; Floresta Tropical Úmida; Nutriente; Solo; Uso da Terra; Amazonia; Agroforestry; Land use; Nutrients; Soil; Water.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/666355

Aperfeicoamento e calibracao de aparelhos coletores de enxurrada para a medicao de perdas de solo, agua e nutrientes em estudos com simulador de chuva.
Provedor de dados: 14
Autores: RESCK, D. V. S.
bitstream/item/84019/1/bolpd-19.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Calibracao; Medida; Simulation; Losses.; Água; Chuva; Conservação; Enxurrada; Equipamento; Manejo; Nutriente; Perda; Simulação; Solo.; Equipment; Rain; Measurement; Nutrients; Soil; Runoff; Water.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549445

Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 45/2.
The experiments started during the first year of the second phase of this project were continued, such as studies about the effect of trees on soil phosphorus and sulfur abailability, dissolved organic nutrients in rainfall, throughfall, stemflow and soil solution. Additionally, we focussed on the effects of cover crops on tree nutrition, soil nutrient and water dynamics. Soil nitrogen and phosphorus uptake was investigated using different N-15 and P-32 tracer experiments. The fate of fertilizer nitrogen was studied with N-15 labelled ammoniumsulfate in plant, soil, soil extracts and soil solution. In laboratory incubations, the effect of leaf quality on decomposition and incorporation of nutrients into soil organic matter was studied as affected by soil...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Água; Floresta Tropical Úmida; Nutriente; Solo; Uso da Terra; Land use; Nutrients; Soil; Tropical rain forests; Water.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669428

Two decades of oligotrophication: Evidence for a phytoplankton community shift in the coastal lagoon of Thau (Mediterranean Sea, France)
Provedor de dados: 5
Autores: Derolez, Valerie; Soudant, Dominique; Malet, Nathalie; Chiantella, Claude; Richard, Marion; Abadie, Eric; Aliaume, Catherine; Bec, Beatrice.
Mediterranean costal lagoons have been exposed to anthropic eutrophication for decades. Thau lagoon is one of the largest among them and provides many ecosystem services including shellfish farming. Considerable efforts were made between the 1970s and the late 2000s to improve the wastewater treatment systems in the lagoon watershed. A decrease in nutrient inputs to Thau lagoon was subsequently observed, evidence for the start of a recovery process in Thau lagoon, following oligotrophication. This decrease has significant consequences for ecosystem communities, above all primary producers. In our study, we characterised and quantified long-term changes by analysing long monitoring time-series (1998-2016) of phytoplankton biomass, abundance and composition...
Tipo: Text
Palavras-chave: Eutrophication; Oligotrophication; Nutrients; Recovery; Phytoplankton community shift; Mediterranean coastal lagoon.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74063/73514.pdf

Effect of environmental and nutritional factors on growth and azaspiracid production of the dinoflagellate Azadinium spinosum
Provedor de dados: 5
Autores: Jauffrais, Thierry; Sechet, Veronique; Herrenknecht, Christine; Truquet, Philippe; Savar, Veronique; Tillmann, Urban; Hess, Philipp.
Azadinium spinosum, a small dinoflagellate isolated from the North Sea, is a producer of azaspiracids (AZAs), a group of biotoxins associated with human illness following ingestion of contaminated shellfish. Using batch and continuous cultures of A. spinosum, the present study investigated the effects of different environmental and nutritional factors (salinity, temperature, photon flux density, aeration, culture media, nitrogen sources, phosphate source, and N/P ratios) on growth, maximum cell concentration, and AZA cell quota.  Azadinium spinosum grew in a wide range of conditions; from 10 ̊C to 26 ̊C and salinities from 30 to 40, under irradiances ranging from 50 μmol m−2 s−1 to 250 μmol m−2 s−1, with or without aeration. Growth and maximum cell...
Tipo: Text
Palavras-chave: AZA; Chemostat; Dinophyceae; Nutrients; N/P ratio; Photobioreactor.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00149/26054/24411.pdf

Nutrient and phytoplankton distribution in the Loire River plume (Bay of Biscay, France) resolved by a new Fine Scale Sampler
Provedor de dados: 5
Autores: Lunven, Michel; Guillaud, Jean-francois; Youenou, Agnes; Crassous, Marie-pierre; Berric, Roger; Le Gall, Erwan; Kerouel, Roger; Labry, Claire; Aminot, Alain.
A new Fine Scale Sampler (FSS) was designed and used in the Loire River plume (Bay of Biscay, France) in order to study phytoplankton distribution in highly stratified water columns. The FSS consists of a linear array of 15 sampling bottles, set horizontally at 20 cm intervals. Data acquired from the CTD and fluorescence probe of the FSS enable it to be precisely positioned at the depth of the highest density gradient or at the chlorophyll a maximum. The FSS made it possible to investigate fine scale vertical distribution of phytoplankton and relationships with water density, nutrient concentrations or light availability, for spring and summer conditions. Under spring conditions, the entire upper layer exhibited a dominant diatom population (Chaetoceros...
Tipo: Text
Palavras-chave: Plankton patchiness; Density discontinuity; Sampling; Thin layer; Nutrients; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-533.pdf

MEDAR/MEDATLAS 2002: A Mediterranean and Black Sea database for operational oceanography Elsevier Oceanography Series
Provedor de dados: 5
Autores: Fichaut, Michele; Garcia, Maria-jesus; Giorgetti, Alessandra; Iona, Athanasia; Kuznetsov, Alexander; Rixen, Michel; Medar Group,.
A comprehensive database of temperature, salinity and bio-chemical parameters in the Mediterranean and Black Sea has been constructed through comprehensive co-operation between the bordering countries. Statistical climatologies have been computed with all assembled and quality controlled data. The database, designed to initiate and validate prediction models, also represents a system to quality-check new incoming data produced by ocean observing systems.
Tipo: Text
Palavras-chave: Database; Temperature; Salinity; Nutrients; Climatology; Quality control.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00351/46177/45876.pdf

Seasonal and intraseasonal biogeochemical variability in the thermocline ridge of the southern tropical Indian Ocean
Provedor de dados: 5
Autores: Resplandy, L.; Vialard, Jerome; Levy, M.; Aumont, Olivier; Dandonneau, Y.
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) time series shows high variability of surface chlorophyll at seasonal and intraseasonal time scales in the oligotrophic southern tropical Indian Ocean thermocline ridge called the Seychelles-Chagos thermocline ridge (SCTR). The SCTR is characterized by an open ocean upwelling due to local Ekman pumping, which annually maintains the mixed layer (ML) shallow and is responsive to atmospheric forcing and in particular to the Madden-Julian Oscillation (MJO) at an intraseasonal time scale. Here we present an overview of SCTR biogeochemistry and investigate the physical processes driving the response observed at seasonal and intraseasonal time scales. Using satellite observations and biophysical ocean...
Tipo: Text
Palavras-chave: Madden julian oscillation; Arabian sea; Rossby waves; Interannual variability; Circulation model; Monsoon; Temperature; Perturbations; Nutrients; Dynamics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29630/27994.pdf

Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Depaepe, Thomas; Vicca, Sara; Van Den Berge, Joke; Stahl, Clement; Courtois, Elodie; Weedon, James; Urbina, Ifigenia; Grau, Oriol; Asensio, Dolores; Peñuelas, Josep; Boeckx, Pascal; Richter, Andreas; Van Der Straeten, Dominique; Janssens, Ivan A.
Background and aims Biological fixation of atmospheric nitrogen (N2) is the main pathway for introducing N into unmanaged ecosystems. While recent estimates suggest that free-living N fixation (FLNF) accounts for the majority of N fixed in mature tropical forests, the controls governing this process are not completely understood. The aim of this study was to quantify FLNF rates and determine its drivers in two tropical pristine forests of French Guiana. Methods We used the acetylene reduction assay to measure FLNF rates at two sites, in two seasons and along three topographical positions, and used regression analyses to identify which edaphic explanatory variables, including carbon (C), nitrogen (N), phosphorus (P) and molybdenum (Mo) content, pH, water...
Tipo: Text
Palavras-chave: Free-living nitrogen fixation; Tropical forest; French Guiana; Nutrients; Phosphorus; Molybdenum.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59901/63083.pdf

Modélisation du devenir à moyen terme dans l'eau et le sédiment des éléments majeurs (N, P, Si) rejetés par la Seine en Baie de Seine
Provedor de dados: 5
Autores: Cugier, Philippe.
The Bay of Seine is a coastal ecosystem submitted to a large river input (Seine river), which brings important quantities of nutrients. This nutrient enrichment leads to frequent eutrophication events and, from the beginning of the eighties, regular toxic phytoplanktonic (Dynophysis) blooms are observed.  In order to study the nutrient cycles (nitrogen, phosphorus, silica) and their contribution to phytoplanktonic stock regulation, a three dimensional model has been developed, based on the coupling between an hydrodynamic part taking into account sediment dynamics (SAM-3D) and an ecological part, which accounts for the main biological compartments and processes.  This model is able to reproduce the main physical and biological characteristics of the...
Tipo: Text
Palavras-chave: Bay of Seine (France); Dinoflagellates; Nutrients; Nutrients; Eutrophication; Sediments; Hydrodynamic; Mathematical models; Baie de (France); Seine; Dinoflagellés; Diatomées; Nutriments; Eutrophisation; Sédiments (géologie); Hydrodynamique; Modèles mathématiques.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/these-3220.pdf

Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM
Provedor de dados: 5
Autores: Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text
Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)
Provedor de dados: 5
Autores: Ben Othman, Hiba; Pringault, Olivier; Louati, Hela; Hlaili, Asma Sakka; Leboulanger, Christophe.
Effects of sediment-released contaminants and nitrogen were assessed on phytoplankton communities sampled from Thau lagoon (France, Mediterranean Sea) and one close offshore marine station. Phytoplankton was exposed to sediment elutriate (seawater containing a mix of metals, organic chemicals, and nutrients) or to ammonium enrichment for four days using immersed microcosms exposed to natural conditions of light and temperature. Functional (production - respiration balance) and structural (taxonomy and cell densities) responses of the phytoplankton community were assessed. In the lagoon, both treatments stimulated phytoplankton growth, compare to controls. Conversely in the offshore station, the phytoplankton growth was stimulated only with the sediment...
Tipo: Text
Palavras-chave: Sediment resuspension; Mediterranean lagoon; Contaminants; Nutrients; Phytoplankton community.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00352/46364/46317.pdf

Changing Biogeochemistry of the Southern Ocean and Its Ecosystem Implications
Provedor de dados: 5
Autores: Henley, Sian F.; Cavan, Emma L.; Fawcett, Sarah E.; Kerr, Rodrigo; Monteiro, Thiago; Sherrell, Robert M.; Bowie, Andrew R.; Boyd, Philip W.; Barnes, David K. A.; Schloss, Irene R.; Marshall, Tanya; Flynn, Raquel; Smith, Shantelle.
The Southern Ocean plays a critical role in regulating global climate as a major sink for atmospheric carbon dioxide (CO2), and in global ocean biogeochemistry by supplying nutrients to the global thermocline, thereby influencing global primary production and carbon export. Biogeochemical processes within the Southern Ocean regulate regional primary production and biological carbon uptake, primarily through iron supply, and support ecosystem functioning over a range of spatial and temporal scales. Here, we assimilate existing knowledge and present new data to examine the biogeochemical cycles of iron, carbon and major nutrients, their key drivers and their responses to, and roles in, contemporary climate and environmental change. Projected increases in...
Tipo: Text
Palavras-chave: Southern Ocean; Biogeochemistry; Primary production; Iron; Nutrients; Carbon; Ecosystem; Ocean acidification.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00676/78831/81113.pdf

When do phytoplankton blooms cause the most intense hypoxia in the northern Adriatic Sea?
Provedor de dados: 5
Autores: Legovic, T; Justic, D.
Eutrophication of the northern Adriatic Sea was investigated using data on dissolved oxygen (DO) from 1911 to 1982. Beginning in the period 1955-1965, DO concentrations increased in the surface layer and decreased close to the bottom in all seasons except winter. These changes are attributed to an increase of the anthropogenic nutrient inflow. The occurrence of hypoxia near the bottom and its disappearance were investigated using the vertical distribution of DO on the transect from the Po delta to Rovinj during 1973. Horizontal distributions of DO close to the surface and near the bottom show prominent gradients from the Po delta towards the middle of the northern Adriatic Sea. Application of a simple box model indicates that phytoplankton blooms which...
Tipo: Text
Palavras-chave: Hypoxia; Phytoplankton blooms; Nutrients; Eutrophication; Adriatic Sea.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20451/18123.pdf

Influence d'un élevage ostréicole sur les flux de nutriments et d'oxygène dans un écosystème lagunaire
Provedor de dados: 5
Autores: Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia.
The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of...
Tipo: Text
Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf

Suivi régional des nutriments sur le littoral Nord-Pas-De-Calais/Picardie Synthèse des résultats du suivi de 1992 à 1994
Provedor de dados: 5
Autores: Hitier, Benoist; Olivesi, Rene; Rybarczyk, Hervé; Delesmont, Régis; Morel, Marc; Loquet, Nicolas.
Nutrients levels of marine water along the North of France coastline are growing-up. They have a good chance to become a problem in the future. Since 1992, a network of three radial lines is sampled at regular interval to supervise on long term : 1. Parameters levels that show the environment quality (temperature, salinity, turbidity,total suspended matters, organic suspended matters, chlorophyll, phaeopigments, phytoplankton). 2. Nutrients concentrations ( ammonia, nitrite, nitrate, phosphate, silicate) that enrich the environment , and may be responsable of its deterioration. The report shows the results of the first three years survey. I t strikes a correlation between the tested parameters and takes stock of the present situation.
Tipo: Text
Palavras-chave: Suivi; Littoral; Nord-Pas de Calais; Picardie; Nutriments; Chlorophylle; Eutrophisation; Survey; Coastline; North of France; Picardie; Nutrients; Chlorophyll; Eutrophycation.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00082/19277/16872.pdf

On the Nutrient distribution and phytoplankton biomass in the Gulf of Guinea equatorial band as inferred from In-situ measurements
Provedor de dados: 5
Autores: Nubi, O A; Bourles, Bernard; Edokpayi, C A; Hounkonnou, M N.
Oceanographic in situ data collected in the Gulf of Guinea during six cruises carried out between 2005 and 2007 were analysed to study the influence of equatorial upwelling on the productivity of the region. At 10°W, observations during boreal summer and autumn cruises captured seasonal upwelling influences. In response to the shoaling pycnocline in June 2005, higher concentrations of nitrate and chlorophyll fluorescence were recorded at the ocean surface in June than in September. Our findings challenge the paradigm that westward advection from the nutrient-rich African coast is responsible for equatorial enrichment in the Gulf of Guinea. Vertical sections of the parameters under study in the summer of 2005 showed no westward advection from 3°E to 10°W...
Tipo: Text
Palavras-chave: Advection; Equatorial undercurrent; Equatorial upwelling; Gulf of Guinea; Nutrients; Phytoplankton biomass.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00621/73324/72489.pdf

Pasteurization: A reliable method for preservation of nutrient in seawater samples for inter-laboratory and field applications
Provedor de dados: 5
Autores: Daniel, Anne; Kerouel, Roger; Aminot, Alain.
Following previous work, the production of reference material for nutrients in seawater, using pasteurization as a preservation method, was carried out seven times between 2006 and 2010 in the framework of inter-laboratory exercises. The preparation of samples from natural seawater allowed to become depleted in nutrients then spiked, bottled and pasteurized, is described. Five main nutrients are involved in this study: ammonium, nitrite, nitrate, phosphate and silicate. Bottles are in glass for the ammonium samples and in plastic for the other nutrients. Pasteurization was performed at 80 ± 3 °C for 2 h. Samples were controlled for homogeneity and stability at 3–5 month interval, before and after the period allocated for each exercise and a third time...
Tipo: Text
Palavras-chave: Pasteurization; Nutrients; Seawater; Inter-laboratory exercises.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00058/16905/15066.pdf

The Kuroshio intermediate water is the major source of nutrients on the East China Sea continental shelf
Provedor de dados: 5
Autores: Chen, Cta.
The Kuroshio subsurface waters upwell onto the East China Sea (ECS) shelf and contribute a large amount of nutrients to the ECS. This contribution is many times more than the inputs from the Yangtze and the Yellow Rivers. The residence time of the ECS shelf water is estimated at 1.3 +/- 0.4 years. The new production rate of phytoplankton is 73 +/- 22 mg C/m(2)/day and the net burial rate of organic carbon is 41 +/- 23 mg C/m(2)/day.
Tipo: Text
Palavras-chave: East China Sea; Kuroshio; Nutrients; New production; Residence time.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20722/18359.pdf

In situ growth potential of the subtidal part of green tide forming Ulva spp. stocks
Provedor de dados: 5
Autores: Merceron, Michel; Antoine, Virginie; Auby, Isabelle; Morand, P.
Ulva spp., the algae most responsible for green tides in Brittany (France), are found on the foreshore and in the most beachward wave area (MBWA) of many bays during green tide phenomena. These algae have recently been seen drifting at greater depths (reaching -20 m). In view of the significant quantities of algae found at these depths, and the less favorable conditions for algal growth than in the intertidal zone, we attempted to determine if they could grow there. For that, during their maximum growth period (from May to July), algae were picked up at three stations located on the foreshore, in the MBWA and in the subtidal (deep) zones of the Bay of Douarnenez, and their nitrogen, carbon and chlorophyll a+b contents were determined, and their...
Tipo: Text
Palavras-chave: Nutrients; Irradiance; Photosynthesis; Ulva sp.; Algal blooms; Eutrophication.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3527.pdf

Mesoscale surface distribution of biogeochemical characteristics in the Crozet Basin frontal zones (South Indian Ocean)
Provedor de dados: 5
Autores: Fiala, M; Delille, B; Dubreuil, C; Kopczynska, E; Leblanc, K; Morvan, J; Queguiner, B; Blain, S; Cailliau, C; Conan, P; Corvaisier, R; Denis, M; Frankignoulle, M; Oriol, L; Roy, S.
A mesoscale study was conducted in January and February 1999 in the Crozet Basin frontal zones (43degrees50' to 45degrees20'S, 61degrees00' to 64degrees30'E) within the southernmost and easternmost convergence area of the Antarctic Circumpolar Current (ACC) and the Agulhas Return Current (ARC). Distribution of biogeochemical parameters was strongly linked to the merged Subtropical (STF) and Subantarctic (SAF) Fronts which mark the border between the cold and less saline subantarctic waters and the warm and more saline subtropical waters. This survey took place during a post-bloom period. Chlorophyll a concentrations were low throughout the study area ranging from 0.2 mug l(-1) in the Polar Frontal Zone (PFZ) to 0.4 mug l(-1) in the Subtropical Zone (STZ)....
Tipo: Text
Palavras-chave: Frontal zones; Nutrients; Biogenic silica; Chlorophyll a; PCO(2); Phytoplankton; Bacteria.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00224/33557/31968.pdf

Effect of local hydroclimate on phytoplankton groups in the Charente estuary
Provedor de dados: 5
Autores: Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and...
Tipo: Text
Palavras-chave: Hydroclimate; Estuary; Phytoplankton; Size composition; Nutrients; Trace metals.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00349/46005/45674.pdf

Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne
Provedor de dados: 5
Autores: Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text
Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf

Les apports en sels nutritifs dans l'estuaire de la Seine
Provedor de dados: 5
Autores: Guillaud, Jean-francois.
In this report, nutrient concentrations and fluxes are evaluated at the Caudebec station in the Seine estuary; with a mean river flow of 413 m3/s, the values of mean interannual fluxes are 46 300 t per year for silicium, 90 700 t per year for total nitrogen and 11 000 t per year for total phosphorus ; since 1984, there is a decrease of phosphate fluxes (3 % per year) and an increase of total nitrogen fluxes (2 % per year).
Tipo: Text
Palavras-chave: Sels nutritifs; Estuaire Seine; Flux; Nutrients; Seine estuary; Fluxes.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00425/53660/54499.pdf

Oligotrophication and Metabolic Slowing-Down of a NW Mediterranean Coastal Ecosystem
Provedor de dados: 5
Autores: Agusti, Susana; Martinez-ayala, Juan; Regaudie-de-gioux, Aurore; Duarte, Carlos M.
Increased oligotrophication is expected for oligotrophic areas as a consequence of ocean warming, which reduces diffusive vertical nutrient supply due to strengthened stratification. Evidence of ocean oligotrophication has been, thus far, reported for the open ocean. Here we reported oligotrophication and associated changes in plankton community metabolism with warming in a pristine, oligotrophic Mediterranean coastal area (Cap Salines, Mallorca Island, Spain) during a 10 years time series. As a temperate area, there were seasonal patterns associated to changes in the broad temperature range (12.0.28.4.C), with a primary phytoplankton bloom in late winter and a secondary one in the fall. Community respiration (R) rates peaked during summers and showed...
Tipo: Text
Palavras-chave: Oligotrophiocation; Mediterranean sea; Respiration; Net community production; Nutrients; Gross primary production; Warming; Chlorophyll.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00419/53091/54048.pdf

La baie de Seine : hydrologie, nutriments, chlorophille (1978-1994)
Provedor de dados: 5
Autores: Aminot, Alain; Guillaud, Jean-francois; Kerouel, Roger.
The data of hydrology, nutrients and chlorophyll obtained in the Bay of Seine over the period 1978-1994, from 14 océanographie cruises, are synthetised and illustrated by an atlas. The Bay is a typical example of a coastal area influenced by a large river. In winter, the nutrient input is drained off into the eastern Channel. In spring, nutrients are consumed intensively. Silicate is the first that drops to limiting levels. The spring bloom generally begins in the centre-east of the Bay. Chlorophyll a can reach up to 40-70 µg/l during the year, values typical of eutrophic coastal areas. Despite the regular increase of nitrogen inputs, the biomass (as chlorophyll) has not significantly changed over a fifteen year period.
Tipo: Text
Palavras-chave: Chlorophyll; Nutrients; Hydrology; Bay of Seine; Chlorophylle; Nutriments; Hydrologie; Baie de Seine.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-1428.pdf

Dynamique hivernale des nutriments et du carbone dans les exutoires du Marais poitevin et flux terrestres associés en Baie de l’Aiguillon
Provedor de dados: 5
Autores: Le Marchand, Marie.
  Coastal environments represent key systems in biogeochemical cycle couplings between continents, oceans and the atmosphere. Despite its relatively modest surface area (7 % of global ocean), this zone accounts for 14-30 % of all oceanic primary production. The amount of nutrients (N, P, C, Si) carried by terrestrial aquatic systems directly influences the primary production, the food web structure and the overall quality of these coastal environments. The present study deals with autumn-winter carbon and nutrients dynamics over terrestrial waters of the Marais poitevin watershed flowing to the Aiguillon bay (west of France). Five heterogeneous watercourses were sampled twice a month since January 2017 to measure nutrients and carbon concentrations and...
Tipo: Text
Palavras-chave: Zones côtières; Cycles biogéochimiques; Carbone; Nutriments; PCO2; Marais poitevin; Coastal areas; Biogeochemical cycles; Carbon; Nutrients; PCO2; Marais poitevin.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00393/50487/51223.pdf

Modélisation écologique tridimensionnelle (3D) de la baie de Seine (Manche, France)
Provedor de dados: 5
Autores: Cugier, Philippe; Ménesguen, Alain; Guillaud, Jean-francois.
A three dimensional (3D) ecological model is developed and applied to the "baie de Seine" area. It consists of a 3D model for hydrodynamics and port (SiAM3D) coupled to an ecological model simulating nutrient cycles (nitrogen, phosphorus, silicon) and two phytoplanktonic classes (diatoms and flagellates). The model is validated by confronting simulations with nine year long series of measurements and then used to better understand the ecosystem functioning. It especially allows to show the role of the proportion of silicon with regard to nitrogen and phosphorus in the summer loadings of the Seine river on the more or less strong presence of flagellates in the river plume. The model was also used to test various hypotheses of reduction of nitrogen loading...
Tipo: Text
Palavras-chave: Modèle 3D; Éléments nutritifs; Diatomées; Flagellés; Baie de Seine; 3D model; Nutrients; Diatoms; Flagellates; Baie de Seine.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00479/59101/61739.pdf

Origine et devenir de la matière organique au sein du micro-estuaire temporaire de Fiume Santu (L’Agriate, Haute-Corse)
Provedor de dados: 5
Autores: Massey, Jean-laurent.
In relation with meteorological, hydrological and topographic characteristics, Corsica has a very large number of temporarily open/closed micro-estuaries. Agriates contains several of them, including the Fiume Santu’s temporarily micro-estuary. These ecosystems are specific because of their sporadic connection with the sea. The opening and closure depends on both the river flow and the presence of the Posidonia oceanica (L.) Delile “banquettes”. Characterization of the global functioning was based on a multiparameter approach (particulate matter and dissolved inorganic matter descriptors, carbon and nitrogen stable isotope, phytoplankton communities), in order to qualify and quantify the organic matter (OM), along an estuary – coastal zone gradient. The OM...
Tipo: Text
Palavras-chave: Corsica; Fiume Santu; Micro-estuaire temporaire; Matière organique; Isotopes stables; Nutriments; Phytoplancton; Corsica; Fiume Santu; Temporarily open/closed micro-estuary; Organic matter; Stable isotope; Nutrients; Phytoplankton.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00276/38691/37188.pdf

Influence of Freshwater Discharges on Biogeochemistry and Benthic Communities of a Coral Reef Ecosystem (La Réunion Island, Indian Ocean)
Provedor de dados: 5
Autores: Tedetti, Marc; Bigot, Lionel; Turquet, Jean; Guigue, Catherine; Ferretto, Nicolas; Goutx, Madeleine; Cuet, Pascale.
We investigated the influence of freshwater discharges on biogeochemistry and benthic communities of La Saline fringing reef, the largest coral reef system of La Réunion Island (France, Indian Ocean). Sampling was conducted in February–March 2012 along a land-ocean continuum, including rivers, groundwater, reef waters, and oceanic waters. Our results indicated the discharges of basalt groundwater (enriched in nitrates) in the southern part of the reef, and the discharges of sand groundwater and river waters (enriched in organic matter) in sites located northward. These discharges mainly impacted fore reef surface waters, while groundwater resurgences were more diffuse and not clearly detected in depth. We highlighted the relationship Si(OH)4/NO3– to...
Tipo: Text
Palavras-chave: Coral reefs; La Reunion; Indian Ocean; Eutrophication; Groundwater; Nutrients; Organic matter; Fluorescence.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77030/78316.pdf

Changes in the annual harmful algal blooms of     Alexandrium minutum     : effects of environmental conditions and drainage basin inputs in the Rance estuary (Brittany, France)
Provedor de dados: 5
Autores: Le Bec, Claude; Legendre, Aurelie; Messiaen, Gregory.
Time series of physico-chemical data and concentrations (cell L-1) of the toxic dinoflagellate Alexandrium minutum collected in the Rance macrotidal estuary (Brittany, France) were analyzed to understand the physico-chemical processes of the estuary and their relation to changes in bloom development from 1996 to 2009. The construction of the tidal power plant in the north and the presence of a lock in the south have greatly altered hydrodynamics, blocking the zone of maximum turbidity upstream, in the narrowest part of the estuary. Alexandrium minutum occurs in the middle part of the estuary. Most physical and chemical parameters of the Rance estuary are similar to those observed elsewhere in Brittany with water temperatures between 15–18 °C, slightly...
Tipo: Text
Palavras-chave: Harmful algae; Dinoflagellate; Nutrients; Eutrophication; Drainage basin; Land runoff.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00341/45257/44698.pdf

Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000
Provedor de dados: 5
Autores: Loyer, Sophie; Lampert, Luis; Menesguen, Alain; Cann, Philippe; Labasque, Thierry.
The French Atlantic shelf is Subjected to strong anthropic influences (urban, industrial and agricultural discharges) of two main rivers (Loire and Gironde). The extension and consequences of these continental loadings for the nutrient and chlorophyll distribution have never been studied before oil the Bay of Biscay continental shelf as a whole. We present the first synoptic view of the nutrient distribution and evolution oil the French Atlantic shelf. Nutrient concentrations of the surface layer were Studied during four cruises in April, June, September 1999 and March 2000. Until June, the freshwater inputs induce a nitrate gradient from river months to offshore waters in the vicinity of the 100 m isobath. The Redfield's ratio Study highlights the nitrate...
Tipo: Text
Palavras-chave: Nutrients; River inputs; Coastal water; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3956.pdf

Dynamique du carbone et des nutriments dans la zone côtière Baie de l’Aiguillon-Pertuis Breton et influence des apports terrestres du bassin versant du Marais poitevin
Provedor de dados: 5
Autores: Lannuzel, Reva.
Coastal zones represent key systems in biogeochemical cycle couplings between continents, oceans and the atmosphere transporting considerable amounts of matter, energy and nutrients (C, N, P et Si) from land to sea. Despite its relatively modest surface area (7 % of the global ocean surface), this zone accounts for 14–30 % of all oceanic primary production. The present study deals with nutrients and carbon dynamics during a full hydrologic cycle in 2017 over the terrestrial-aquatic continuum formed by the Poitevin Marsh-Aiguillon Bay- Breton Sound to better understand terrestrial export influence on the coastal zone. Carbon and nutrient concentrations were sampled twice a month over heterogeneous sites (estuaries, channels and coastal sites) to integrate...
Tipo: Text
Palavras-chave: Zone côtière; Biogéochimie; Carbone; Nutriments; Chlorophylle a; Limitation potentielle et réelle; Dynamique.; Coastal zone; Biogeochemistry; Carbon; Nutrients; Chlorophyll a; Real and potential limitation; Spatio-temporal dynamic.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00445/55647/57299.pdf

Assessment of the quantities of herbicides and nutrients brought down by the river Charente to the coast and modelling of the dispersion of atrazine in the Marennes-Oleron bay
Provedor de dados: 5
Autores: Munaron, Dominique; Dubernet, Jf; Delmas, F; Stanisiere, Jean-yves; Scribe, P.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring, a better understanding of the impact on coastal ecosystems by modelling the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the river Charente and its estuary reveals that agricultural activity on the watershed area is omnipresent, as well on the level of the nitrogen as on the one of herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shell fish-farming activity. Hydrodynamic modelling will constitute an...
Tipo: Text
Palavras-chave: Marennes Oleron bay; River Charente; Modelling; Fluxes; Nutrients; Herbicides.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3612.pdf

Spatial variability in oxygen and nutrient fluxes at the sediment-water interface on the continental shelf in the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Denis, L; Grenz, C.
The spatial variability of oxygen and dissolved nutrient exchanges across the sediment-water interface was studied on the continental shelf in the Gulf of Lions (NW Mediterranean Sea). Replicate sediment cores were sampled at nine stations (64-162 m depth) along two lines parallel to the coast during two cruises in March and June 1998. Sediment-water exchanges were measured using the core incubation technique. Surficial sediments, bottom water and interstitial water characteristics were also described. Fluxes of oxygen (3.72-8.83 mmol m(-2) d(-1)), nitrate (0.026-0.283 mmol m(-2) d(-1)), ammonium (-0.022 to 0.204 mmol m(-2) d(-1)), nitrite (-0.034 to 0.002 mmol m(-2) d(-1)), phosphate (-0.007 to 0.029 mmol m(-2) d(-1)) and silicate (0.504-1.656 mmol m(-2)...
Tipo: Text
Palavras-chave: Flux à l’interface eau-sédiment; Sels nutritifs; Minéralisation; Méditerranée nord-occidentale; Plateau continental; Sediment-water fluxes; Nutrients; Mineralization processes; NW Mediterranean; Continental shelf.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43263/42994.pdf

Accumulation des sels nutritifs dans un sédiment lagunaire et environnement hydrodynamique
Provedor de dados: 5
Autores: Gomez, E; Millet, B; Picot, B.
The Mejean-Perols Lagoon is situated on the French Mediterranean coast. It is a small (747 ha) and shallow (70 cm) lagoon. Some treated effluent from Montpellier flows into this hypereutrophic lagoon. The cartography of C, N and P concentrations in the sediment was studied based on 35 bottom samples. The nitrogen and organic carbon concentrations were more or less homogeneous, the highest concentrations being found in the middle of the lagoon. The phosphate was principally bound onto the sediment in the west zone. The observed distribution was independent of grain size, the distribution of which was rather homogeneous. In this lagoon water circulation is wind induced. Four different water flow structures were observed, as functions of the prevailing winds...
Tipo: Text
Palavras-chave: Sédiment; Lagune côtière; Hydrodynamique; Sels nutritifs; Carbone; Sediment; Coastal lagoon; Hydrodynamics; Nutrients; Carbon.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43642/43247.pdf

The seasonal dynamics of nutrient and chlorophyll a concentrations on the SE Mediterranean shelf-slope
Provedor de dados: 5
Autores: Herut, Barak; Almogi-labin, Ahuva; Jannink, Natasja; Gertman, Isaac.
We report the results of a sequence of twelve research cruises over a two-year period, from June 1996 through May 1998 that examined the seasonal variations in the nutrient (NO(3)(-) PO(4)(3-), and Si(OH)(4)) and in the chlorophyll a (Chl a) concentrations at two permanent stations across the SE Mediterranean continental shelf and slope (120 and 400 m water depth off the Israeli coast). Seasonally-dependent Chl a concentrations ranged between 0.003 and 0.415 mg m(-3). Following autumn and winter a distinct biomass phytoplankton peak was produced (similar to 30 mg Chl a m(-2) in the upper 120 m) and a subsequent moderate spring peak was observed. In the decomposition zone (120-400 m), an opposite pattern was observed with decreasing amounts of NO(3)(-) and...
Tipo: Text
Palavras-chave: Nutriments; Méditerranée; Chlorophyll a; Oligothropie; Nutrients; Mediterranean; Chlorophyll alpha; Oligothropy.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43374/42837.pdf

Environmental significance of microbialites in reef environments during the last deglaciation
Provedor de dados: 5
Autores: Camoin, G; Cabioch, G; Eisenhauer, A; Braga, J; Hamelin, B; Lericolais, Gilles.
In situ microbialites occurring in reef rocks dredged between 80 and 130 in water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 2900 to 4410 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise.   Microbialites developed in both shallow and deep water depositional environments where they characterize various zones of the reef tracts (reef crests, upper reef slopes, deep fore-reef slopes), reflecting contrasting scenarios of microbialite development involving ''reefal microbialites'' in shallow-water settings and ''slope microbialites'' that formed in environments deeper than 1020 in and extending down to more than 100 m.   Reefal microbialites...
Tipo: Text
Palavras-chave: Sea level changes; Nutrients; French polynesia; Holocene; Last deglaciation; Microbialites; Coral reefs.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-4204.pdf

La qualité des eaux dans l'Estuaire de la Gironde. 1- Traitement des données. 2 - Synthèse
Provedor de dados: 5
Autores: Maurice, Laurence.
The main problem of the Girond estuary is a pollution by the cadmium. During this last ten years, the good quality of the water is proved by the analysis of the main physico - chemical and biochemical parameters and bacteria. But since 1989, straight to the Blayais power station, the BOD5 varied between 2 and 3,5 mg.l-1 and a diminution of the dissolved oxygen has been observed; it's probably caused by the accumulation of biodegradable organic matter in the maximum turbidity zone during years characterized by low river flows. For average river flow, urban discharges takes part for 20 % in total fluxes of BD05; in 1991, this part attempts 35 %. During the last 7 years, the pluriannual evolution of the nitrate concentrations measured in the Garonne river...
Tipo: Text
Palavras-chave: Oxygène; Sels nutritifs; Matière organique; Bactéries; Apports; Estuaire Gironde; Oxygen; Nutrients; Organic matter; Bacteria; Fluxes; Gironde estuary.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00037/14855/12178.pdf

Decadal variability in chlorophyll and primary production off NW Spain
Provedor de dados: 5
Autores: Bode, Antonio; Anadón, Ricardo; Anxelu G. Morán, Xosé; Nogueira, Enrique; Teira, Eva; Varela, Manuel.
Long-term variability of phytoplankton biomass (chlorophyll a) and primary production (carbon fixation) in relation to changes in climatic and oceanographic factors was analysed for oceanic and shelf waters of the north and northwest Iberian Peninsula. Changes related to stratification in the water column and upwelling intensity were specifically addressed. The time series include measurements of primary production and biomass over 19 yr. Seasonally, the main mode of temporal variability of the series is the occurrence of phytoplankton blooms during the winter-spring and summer- autumn transition periods. On the northwestern coast (Galicia), the blooms are more frequent and attain higher biomass and production values than on the northern coast (Mar...
Tipo: Text
Palavras-chave: Primary production; Upwelling; Climate change; Nutrients; Remineralisation; NE Atlantic.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00052/16356/13862.pdf

Variation in the composition of carbohydrates in the Dona Paula Bay (west of India) during May/June 1998
Provedor de dados: 5
Autores: D'Souza, F; Bhosle, Nb.
Suspended particulate material was analysed for particulate carbohydrate concentration and composition and for the bulk parameters: suspended particulate matter, chlorophyll a, particulate organic carbon, particulate organic nitrogen and particulate proteins. Chlorophyll a concentrations increased from May 7 to 15 due to the development of a small scale bloom of diatom Navicula sp. and decreased for the remaining period after the premonsoon rain on 16 and 17 May. Concentrations of particulate organic carbon, organic nitrogen, carbohydrates and proteins increased with the increase in chlorophyll a concentration. Together particulate protein-carbon and carbohydrate-carbon accounted for 10 to 30% of the organic carbon. Glucose contributed 26 to 81% to the...
Tipo: Text
Palavras-chave: Hydrates de carbone; Côte de l’Inde; Nutriments; Matière particulaire en suspension; Carbohydrates; India coast; Nutrients; Suspended particulate matter.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43351/42862.pdf

Benthic metabolism over the emersion - Immersion alternation in sands colonized by the invasive Manila clam Ruditapes philippinarum
Provedor de dados: 5
Autores: Migne, Aline; Trigui, Rima Jihane; Davoult, Dominique; Desroy, Nicolas.
The effect of an invasive infaunal suspension-feeding bivalve, the Manila clam Ruditapes philippinarum, on benthic inorganic carbon and nutrient fluxes was examined through in situ incubations. Measurements were performed in spring and summer on a tidal sandflat of the Rance estuary (south part of the Western English Channel) colonized by the Manila clam after its deliberate introduction in the 1990's. Benthic inorganic carbon fluxes were measured using light and dark benthic chambers both at emersion and immersion. Benthic nutrient fluxes were measured using dark benthic chambers at immersion. Inorganic carbon (IC) and ammonium sediment release under darkness at immersion reached 5.60 mmol m−2 h−1 and 441 μmol m−2 h−1 respectively for a clam density of...
Tipo: Text
Palavras-chave: Benthic fluxes; Benthos; Inorganic carbon; Nutrients; Suspension-feeding bivalve; Tidal flats; France; Western English Channel.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00412/52327/53100.pdf

Inter and intra-specific transcriptional and phenotypic responses of   Pseudo-nitzschia   under different nutrient conditions
Provedor de dados: 5
Autores: Lema, Anais Kimberley; Metegnier, Gabriel; Quéré, Julien; Latimier, Marie; Youenou, Agnes; Lambert, Christophe; Fauchot, Juliette; Le Gac, Mickael.
Untangling the functional basis of divergence between closely related species is a step towards understanding species dynamics within communities at both the evolutionary and ecological scales. We investigated cellular (i.e: growth, domoic acid production, nutrient consumption) and molecular (transcriptomic analyses) responses to varying nutrient concentrations across several strains belonging to three species of the toxic diatom genus Pseudo-nitzschia. Three main results were obtained. First, strains from the same species displayed similar transcriptomic, but not necessarily cellular, responses to the experimental conditions. It showed the importance of considering intra-specific diversity to investigate functional divergence between species. Second, a...
Tipo: Text
Palavras-chave: Phenotype; Transcriptomics; Pseudo-nitzschia; Divergence; Nutrients.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00482/59392/62157.pdf

Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus
Provedor de dados: 5
Autores: Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text
Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf

Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests
Provedor de dados: 5
Autores: Peguero, Guille; Sardans, Jordi; Asensio, Dolores; Fernández-martínez, Marcos; Gargallo-garriga, Albert; Grau, Oriol; Llusià, Joan; Margalef, Olga; Márquez, Laura; Ogaya, Romà; Urbina, Ifigenia; Courtois, Elodie A.; Stahl, Clément; Van Langenhove, Leandro; Verryckt, Lore T.; Richter, Andreas; Janssens, Ivan A.; Peñuelas, Josep.
Soil fauna is a key control of the decomposition rate of leaf litter, yet its interactions with litter quality and the soil environment remain elusive. We conducted a litter decomposition experiment across different topographic levels within the landscape replicated in two rainforest sites providing natural gradients in soil fertility to test the hypothesis that low nutrient availability in litter and soil increases the strength of fauna control over litter decomposition. We crossed these data with a large dataset of 44 variables characterizing the biotic and abiotic microenvironment of each sampling point and found that microbe-driven carbon (C) and nitrogen (N) losses from leaf litter were 10.1 and 17.9% lower, respectively, in the nutrient-poorest site,...
Tipo: Text
Palavras-chave: Biogeochemistry; Extracellular enzyme activity; Litter decomposition; Nutrients; Soil fauna.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00513/62424/69469.pdf

Recovery trajectories following the reduction of urban nutrient inputs along the eutrophication gradient in French Mediterranean lagoons
Provedor de dados: 5
Autores: Derolez, Valerie; Bec, Beatrice; Munaron, Dominique; Fiandrino, Annie; Pete, Romain; Simier, Monique; Souchu, Philippe; Laugier, Thierry; Aliaume, Catherine; Malet, Nathalie.
Tipo: Text
Palavras-chave: Recovery; Oligotrophication; Coastal lagoons; Urban inputs; Nutrients.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00478/58953/61574.pdf

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Devreker, David.
The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of...
Tipo: Text
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf

Aggregated and Validated Datasets for the European Seas: The Contribution of EMODnet Chemistry
Provedor de dados: 5
Autores: Giorgetti, Alessandra; Lipizer, Marina; Molina Jack, Maria Eugenia; Holdsworth, Neil; Jensen, Hans Mose; Buga, Luminita; Sarbu, George; Iona, Athanasia; Gatti, Julie; Larsen, Martin; Fyrberg, Lotta; Østrem, Ann Kristin; Schlitzer, Reiner.
Tipo: Text
Palavras-chave: Nutrients; Oxygen; Acidity; Contaminants; Sediment; Biota; Aggregated datasets.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00663/77519/79314.pdf

Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France)
Provedor de dados: 5
Autores: Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models.  In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text
Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf

Estimates of Water-Column Nutrient Concentrations and Carbonate System Parameters in the Global Ocean: A Novel Approach Based on Neural Networks
Provedor de dados: 5
Autores: Sauzede, Raphaelle; Claustre, Hervé; Bittig, Henry; Pasqueron De Fommervault, Orens; Gattuso, Jean-pierre; Legendre, Louis; Johnson, Kenneth S.
A neural network-based method (CANYON: CArbonate system and Nutrients concentration from hYdrological properties and Oxygen using a Neural-network) was developed to estimate water-column biogeochemically relevant variables in the Global Ocean. These are the concentrations of 3 nutrients [nitrate (NO3−), phosphate (PO43−) and silicate (Si(OH)4)] and 4 carbonate system parameters [total alkalinity (AT), dissolved inorganic carbon (CT), pH (pHT) and partial pressure of CO2 (pCO2)], which are estimated from concurrent in situ measurements of temperature, salinity, hydrostatic pressure and oxygen (O2) together with sampling latitude, longitude and date. Seven neural-networks were developed using the GLODAPv2 database, which is largely representative of the...
Tipo: Text
Palavras-chave: Neural network; Nutrients; Carbonate system; Global ocean; GLODAPv2 database; Profiling floats.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00383/49467/49952.pdf

Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model
Provedor de dados: 5
Autores: Jose, Yonss; Aumont, Olivier; Machu, Eric; Penven, Pierrick; Moloney, C. L.; Maury, Olivier.
The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations of chlorophyll at their cores, which contrasts with previous studies in the open ocean. In addition, several anticyclonic eddies were simulated with high concentrations of chlorophyll at their cores. Phytoplankton growth within these mesoscale features (both cyclonic and anticyclonic eddies) occurred in response to nutrient injection into the euphotic...
Tipo: Text
Palavras-chave: Ocean physical-biogeochemical coupling; Cyclonic and anticyclonic eddies; Chlorophyll; Nutrients; Mozambique Channel.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00162/27320/25549.pdf

Analyse des tendances des séries temporelles de la concentration en azote minéral dissous dans les trois principaux estuaires de la façade Manche-Atlantique
Provedor de dados: 5
Autores: Gailhard, Isabelle.
Estuaries are areas which, from their structure, their fonctioning, and their localisation, are subject to significant contribution of nutrients. One of the objectif of the RNO, the French network for coastal water quality monitoring, is to assess the levels and trends of nutrient concentrations in estuaries. A linear model was used in order to describe and to explain the total dissolved nitrogen concentration evolution in the three most important estuaries on the Chanel-Atlantic front (Seine, Loire and Gironde). As a first step, the selection of a reliable data set was performed. Then total dissolved nitrogen evolution schemes in estuary environment were graphically studied, and allowed a resonable choice of covariables. The salinity played a major role...
Tipo: Text
Palavras-chave: Nutriments; Estuaire; Loire; Seine; Gironde; Schéma de dilution; Modèle linéaire; Tendance; Nutrients; Estuary; Seine; Loire; Gironde; Dilution schema; Linear mode1; Trend.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00079/19070/16665.pdf

Spatial variability in autumnal equatorial upwelling intensity within the Gulf of Guinea as inferred from in situ measurements
Provedor de dados: 5
Autores: Nubi, O. A.; Oyatola, O.o; Bonou, F.
In attempt to study the spatial differences in autumnal equatorial upwelling intensity relative to bio-productivity in the eastern equatorial Atlantic, oceanographic in situ data along regions 10°W, 0°E, 2.5°E and 6°E, collected in the Gulf of Guinea during autumn cruise carried out in September 2007 were analyzed. The surface mean values for temperature along 10°W, 0°E, 2.5°E and 6°E are 25.02, 26.15, 26.88 and 25.60°C, respectively. There was eastward weakening of the equatorial undercurrent from 10°W until its complete disappearance at 6°E. The highest concentration of nitrate recorded at the surface at 10°W was attributed to the shoaling pycnocline observed at this region. The surface mean values for nitrate along 10°W, 0°E, 2.5°E and 6°E are 0.37,...
Tipo: Text
Palavras-chave: Vertical mixing; Zonal advection; Equatorial undercurrent; Equatorial upwelling; Gulf of Guinea; Nutrients; Phytoplankton biomass; Surface enrichment.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00621/73318/72485.pdf

Valorisation des rejets urbains et thermiques en zone littorale - Production primaire
Provedor de dados: 5
Autores: Bazzon, H.; Lepailleur, M.; Rogger, M.
Discharges of urban sewage water and waste heat from industries or power plants can be used in modern saltwater aquaculture. Urban sewage water diluted to 30 % in seawater which temperature is increased of 10 to 15° C gives a primary productivity equal to the produc­tivity of a standard culture medium. That bio-treatment which includes the addition of calories to the seawater, eliminates up to 90 % of the phosphorus and the nitrates.
Tipo: Text
Palavras-chave: Eau résiduaire urbaine; Calories; Algues marines; Aquaculture; Nutrients; Urban sewage water; Calories; Marine algae; Aquaculture; Nutrients.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41660/40869.pdf

Rôle de l’apport atmosphérique sur les processus de biodégradation et la stoechiométrie de la matière organique dissoute en mer Méditerranée
Provedor de dados: 5
Autores: Djaoudi, Kahina.
Establishing a link between atmospheric deposition and the dissolved organic matter (DOM) pool in the Mediterranean Sea is currently hampered by: (1) a poor knowledge on the surface dissolved phosphate (P) pool, mainly due to low concentrations of dissolved inorganic phosphate (DIP), (2) a critical lack of data on atmospheric fluxes of organic C, N and P and (3) the lack of information on their bioavailability. This PhD thesis aimed at filling these gaps. (1) Relying upon a sensitive determination of DIP, the coverage of the valid dissolved organic phosphate data was enhanced up to 70%, revealing a vertical pattern in the dissolved phosphate biogeochemistry in surface waters. (2) Atmospheric fluxes of soluble organic C, N and P were quantified and were 59...
Tipo: Text
Palavras-chave: Dépôt atmosphérique; Matière organique dissoute; Rapports C:N:P; Nutriments; Mer Méditerranée; Biodisponibilité.; Atmospheric deposition; Dissolved organic matter; C:N:P ratios; Nutrients; Mediterranean Sea; Bioavailability.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00677/78944/81332.pdf

Macroalgal population and sustainability
Provedor de dados: 5
Autores: Morand, Philippe; Merceron, Michel.
Algal blooms, often associated with eutrophication, are common in temperate regions in coastal lagoons and estuarine areas as well as in open seas. However, because of recent changes in water flows and sediment and nutrient loads in most rivers, eutrophication phenomena are now occurring in areas previously non affected. One of its most widespread and easily recognized effects in a coastal marine ecosystem is the excessive growths and drifts of macroalgae, to such a degree that the biomass becomes a significant problem.   The nutrients, notably from anthropogenic origin, constitute a significant factor in the appearance of the blooms in coastal waters. Besides a background originating from natural areas and precipitations, nutrients come from agriculture,...
Tipo: Text
Palavras-chave: Green tides; Macroalgae; Eutrophication; Nutrients; Black Sea.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2131.pdf

Modelling ecological change over half a century in a subtropical estuary: impacts of climate change, land-use, urbanization and freshwater extraction
Provedor de dados: 5
Autores: Condie, Scott A.; Hayes, Donna; Fulton, Elizabeth A.; Savina, Marie.
The Clarence River Estuary is the largest estuary in southeast Australia, with an extensive floodplain encompassing multiple river channels and a large coastal lagoon. It is the focus of major commercial and recreational fisheries and there is pressure to divert its freshwater inputs for agricultural and domestic uses. We used a spatial biogeochemical model to simulate the variability and evolution of this system on timescales from days to decades over the past half century. Like most tropical and subtropical estuaries, the Clarence River Estuary is strongly influenced by river discharge, sediment and nutrient loads. Given the high nutrient loads arriving from the upper catchment, plankton biomasses in the model were typically limited by flushing through...
Tipo: Text
Palavras-chave: Coastal lagoon; Flushing; Land-use; Climate impacts; Nutrients; Phytoplankton; Zooplankton.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00175/28673/27113.pdf

Seasonal variation of riverine nutrient inputs in the northern Bay of Biscay (France), and patterns of marine phytoplankton response
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Aminot, Alain; Delmas, Daniel; Gohin, Francis; Lunven, Michel; Labry, Claire; Herbland, Alain.
Seasonal variations in nutrient inputs are described for the main rivers (Loire and Vilaine) flowing into the northern Bay of Biscay. The river plumes are high in N/P ratio in late winter and spring, but not in the inner plume during the summer. Conservative behavior results in most nutrients entering the estuary and eventually reaching the coastal zone. Temporal and spatial aspects of phytoplankton growth and nutrient uptake in the northern Bay of Biscay distinguish the central area of salinity 34 from the plume area. The first diatom bloom appears offshore in late winter, at the edge of the river plumes, taking advantage of haline stratification and anticyclonic "weather windows." In spring, when the central area of the northern shelf is...
Tipo: Text
Palavras-chave: Northern Bay of Biscay; Phytoplankton; Continental shelf; Riverine inputs; Nutrients.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2007/publication-2354.pdf

Effects of Nitrogen Availability on the Antioxidant Activity and Carotenoid Content of the Microalgae Nephroselmis sp
Provedor de dados: 5
Autores: Coulombier, Noémie; Nicolau, Elodie; Le Déan, Loic; Barthelemy, Vanille; Schreiber, Nathalie; Brun, Pierre; Lebouvier, Nicolas; Jauffrais, Thierry.
Nephroselmis sp. was previously identified as a species of interest for its antioxidant properties owing to its high carotenoid content. In addition, nitrogen availability can impact biomass and specific metabolites’ production of microalgae. To optimize parameters of antioxidant production, Nephroselmis sp. was cultivated in batch and continuous culture conditions in stirred closed photobioreactors under different nitrogen conditions (N-repletion, N-limitation, and N-starvation). The aim was to determine the influence of nitrogen availability on the peroxyl radical scavenging activity (oxygen radical absorbance capacity (ORAC) assay) and carotenoid content of Nephroselmis sp. Pigment analysis revealed a specific and unusual photosynthetic system with...
Tipo: Text
Palavras-chave: Lutein; Natural products; Nutrients; Peroxyl radical; Siphonaxanthin.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00645/75699/76604.pdf

Observations of the Ushant tidal front in September 2007
Provedor de dados: 5
Autores: Le Boyer, A.; Cambon, Gildas; Daniault, N.; Herbette, Steven; Le Cann, B.; Marie, Louis; Morin, P.
The Ushant tidal front is the dominant feature of the summer season hydrological structure of the Iroise Sea. It separates tidally mixed coastal waters from thermally stratified open Celtic Sea waters. This article reports on observations made in September 2007 during two short cruises that took place aboard R/V "Cotes de la Manche", and gives a general account of the physical structure of the front along one cross-frontal transect. The data set comprises data from a 4 month ADCP mooring, short CTD/fluorescence/nutrients transects, Lagrangian drifter trajectories, and HF radar surface current measurements. One finding is that the surface and bottom fronts, being affected by different dynamical influences, are not necessarily coincident in the vertical....
Tipo: Text
Palavras-chave: Nutrients; Drifters; HF radars; Hydrology; Tidal mixing front; Shelf dynamics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6417.pdf

Modélisation des blooms de Gymnodinium mikimotoï le long de la façade atlantique française : répartition spatiale
Provedor de dados: 5
Autores: Loyer, Sophie; Lazure, Pascal; Gentien, Patrick; Menesguen, Alain.
In order to study the occurrence of Gymnodinium mikimotoï bloom on the French Atlantic coast, a three-dimensional model of primary production was set up. The biological model was coupled to a hydrodynamic model previously developed at Ifremer, by the intermediary of transport, diffusion and heat fluxes. The cycles of three limiting elements for the phytoplankton growth were modelised: nitrogen, phosphorus and silicon. The second phase of the study aimed at reproducing the summer dinoflagellate blooms. In this new approach a model of the species Gymnodinium mikimotoï was coupled with the previous biomass model which provides the physical and chemical environments. The study focuses on the results obtained by this specific sub-model. The parametrisation was...
Tipo: Text
Palavras-chave: Turbulence; Dinoflagellés; Gymnodinium mikimotoï; Modèle; Nutriments; Turbulence; Dinoflagellate; Gymnodinium mikimotoï; Model; Nutrients.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00479/59100/61738.pdf

Hydrologie et distribution de dinophysis en juin 1988, dans la frange côtière nord-Gascogne
Provedor de dados: 5
Autores: Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele.
During the oceanographic cruise of June 1988, phytoplankton and correlated hydrological parameters were studied in the coastal area between Camaret and Ile d'Oléron. 62 stations were sampled in the 0-30 m layer within the 50 m depth limited coastal area. Observations focused on two toxic dinoflagellate species: Dinophysis spp and Gyrodinium aureolum. Dinophysis spp is more abundant in the Loire/Vilaine area, which is.characterized by high surface Nitrate levels, high 30 m depth Phosphate levels and Chlorophyll a amounts higher than elsewhere during the survey. This particuliar pattern can be related to the Nutrient outputs of Loire and Vilaine Rivers. Max. Dinophysis concentrations were observed in Vilaine bay (very high Phosphate levels) and in Douarnenez...
Tipo: Text
Palavras-chave: Phytoplancton; Dinophysis; Gyrodinium aureolum; Hydrologie; Sels nutritifs; Campagne côtière; Nord Gascogne; Phytoplankton; Dinophysis; Gyrodinium aureolum; Hydrology; Nutrients; Coastal cruise; Northern Biscay.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00432/54323/58896.pdf

Long-term water quality in the lower Seine: Lessons learned over 4 decades of monitoring
Provedor de dados: 5
Autores: Romero, Estela; Le Gendre, Romain; Garnier, Josette; Billen, Gilles; Fisson, Cedric; Silvestre, Marie; Riou, Philippe.
The Seine River is a highly artificialised catchment in Europe, comprising both productive agricultural areas and intense industrial and commercial activity. Due to its strategic importance, monitoring programs in the river started as early as the 1970s. The present study compiles and analyses this valuable data set (1970–2014), thoroughly describing the riverine section downstream of Paris and the estuary. We identify long-term trends and shifting patterns in nutrients and oxygen, and pay special attention to the river’s evolution after the year 2000, when the European Water Framework Directive came into force. The study has a manifest management perspective, and the results are discussed on the basis of the environmental quality standards proposed in...
Tipo: Text
Palavras-chave: Seine River; Water quality; Nutrients; Long-term trends; WFD; Policy.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00311/42202/41541.pdf

Phosphorus losses in runoff after application of litter from broilers fed high-available phosphorus corn feed
Provedor de dados: 18
Autores: Tarkalson, D.D.; Mikkelsen, R.L.
Recent efforts to reduce phosphorus (P) content of corn grain fed to poultry  have led to the development of low-phytic-acid corn. Research is needed to evaluate  the environmental impact of the application to cropland of manure from animals fed  low-phytic-acid corn. The purpose of this research was to determine P losses in  runoff from a bare Piedmont soil (cecil clay loam; clayey, kaolinitic, thermic, Typic  Kanhapludult) in the southeastern United States receiving surface applications of  broiler litter from birds fed a low-phytic-acid corn (HAP broiler litter). The HAP  litter was applied at rates of 0, 8, 16, 33, 49, 66, and 82 kg P ha-1  . Simulated  rainfall was applied at a rate of 7.6 cm hr-1 on the same day the litter sources were  applied to...
Tipo: Article
Palavras-chave: Corn / maize; Nutrients; Corn; Chemistry; Mass Import - autoclassified (may be erroneous).
Ano: 2007
URL: http://eprints.nwisrl.ars.usda.gov/64/1/1229.pdf

Phosphorus losses in furrow irrigation runoff
Provedor de dados: 18
Autores: Westermann, D.T.; Bjorneberg, D.L.; Aase, J.K.; Robbins, C.W.
Tipo: Article
Palavras-chave: Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 2001
URL: http://eprints.nwisrl.ars.usda.gov/120/1/1042.pdf

Hardwood biochar influences calcareous soil physicochemical and microbiological status
Provedor de dados: 18
Autores: Ippolito, J.A.; Stromberger, M.E.; Lentz, R.D.; Dungan, R.S.
The effects of biochar application to calcareous soils are not well documented. In a laboratory incubation study, a hardwood-based, fast pyrolysis biochar was applied (0, 1, 2, and 10% by weight) to a calcareous soil. Changes in soil chemistry, water content, microbial respiration, and microbial community structure were monitored over a 12-month period. Increasing biochar application rate increased the water holding capacity of the soil-biochar blend, a trait that could be beneficial under water limited situations. Biochar application also caused an increase in plant-available iron and manganese, soil carbon content, soil respiration rates, bacterial populations, and a decrease in soil nitrate-nitrogen concentration. Biochar rates of 2 and 10% altered the...
Tipo: Article
Palavras-chave: Calcareous soil; Nitrogen; Nutrients.
Ano: 2014
URL: http://eprints.nwisrl.ars.usda.gov/1532/1/1490.pdf

Conservation tillage effects on sediment and phosphorus losses from a furrow irrigated field
Provedor de dados: 18
Autores: Bjorneberg, David L.; Aase, J. Kris.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Nutrients; Tillage; Mass Import - autoclassified (may be erroneous).
Ano: 2004
URL: http://eprints.nwisrl.ars.usda.gov/952/1/1141.pdf

Phosphorus runoff from two water sources on a calcareous soil
Provedor de dados: 18
Autores: Aase, J.K.; Bjorneberg, D.L.; Westermann, D.T.
Tipo: Article
Palavras-chave: Nutrients; Calcareous soil; Mass Import - autoclassified (may be erroneous).
Ano: 2001
URL: http://eprints.nwisrl.ars.usda.gov/124/1/1046.pdf

Nutrient losses from an irrigated watershed in southern Idaho
Provedor de dados: 18
Autores: Bjorneberg, D.L.; Ippolito, J.A.; Koehn, A.C.
Water, sediment and nutrients flowing into and out of the 82,000 ha Twin Falls,ID irrigation tract were measured from 2005 to 2008. Approximately 80% of the water flowing into the watershed was irrigation water diverted from the Snake River. About 40% of the watershed inflow returned to the Snake River. Much of this return flow was water from subsurface drain tiles and tunnels that drain shallow groundwater. Converting from furrow to sprinkler irrigation, improved irrigation management, and constructed sediment ponds have reduced sediment loss from 460 kg/ha in 1971 to &lt;100 kg/ha in 2005. In 2007 and 2008, more sediment and phosphorus entered the watershed than returned to the Snake River. Diverting irrigation water into the watershed removed 6300 Mg of...
Tipo: Conference or Workshop Item
Palavras-chave: Irrigation control; Runoff losses; Nutrient losses; Nutrients; Soil.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1571/1/1527.pdf

Controlling sprinkler irrigation runoff, erosion, and phosphorus loss with straw and polyacrylamide
Provedor de dados: 18
Autores: Bjorneberg, D.L.; Aase, J.K.; Westermann, D.T.
Tipo: Article
Palavras-chave: Polyacrylamide; Sraw residue; Nutrients; Sprinkler irrigation; Erosion control; Runoff; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 2000
URL: http://eprints.nwisrl.ars.usda.gov/115/1/1027.pdf

Soil water measurements relevant to agronomic and environmental functions of chemically treated soil
Provedor de dados: 18
Autores: Sojka, R.E.; Lehrsch, G.A.; Kostka, S.J.; Reed, J.L.; Koehn, A.C.; Foerster, J.A.
Tipo: Article
Palavras-chave: Nutrients; Soil; Water.
Ano: 2009
URL: http://eprints.nwisrl.ars.usda.gov/1349/1/1326.pdf

Nutrient losses from manure and fertilizer applications as impacted by time to first runoff event
Provedor de dados: 18
Autores: Smith, D.R.; Owens, P.R.; Leytem, A.B.; Warnemuende, E.A.
Nutrient losses to surface waters following fertilization contribute to eutrophication. This study was conducted to compare the impacts of  fertilization with inorganic fertilizer, swine (Sus scrofa domesticus) manure or poultry (Gallus domesticus) litter on runoff water quality, and  how the duration between application and the first runoff event affects resulting water quality. Fertilizers were applied at 35 kg P ha-1-, and  the duration between application and the first runoff event varied between 1 and 29 days. Swine manure was the greatest risk to water quality  1 day after fertilization due to elevated phosphorus (8.4 mg P L -1) and ammonium (10.3 mg NH4-N L-1) concentrations; however, this risk  decreased rapidly. Phosphorus concentrations were 2.6...
Tipo: Article
Palavras-chave: Nutrients; Chemistry; Fertilizer; Mass Import - autoclassified (may be erroneous).
Ano: 2007
URL: http://eprints.nwisrl.ars.usda.gov/61/1/1223.pdf

Phosphorus in surface runoff from calcareous arable soils of the semiarid Western United States
Provedor de dados: 18
Autores: Turner, Benjamin L.; Kay, Mary A.; Westermann, Dale T.
Tipo: Article
Palavras-chave: Nutrients; Calcareous soil; Mass Import - autoclassified (may be erroneous).
Ano: 2004
URL: http://eprints.nwisrl.ars.usda.gov/2/1/1135.pdf

Polyacrylamide for surface irrigation to increase nutrient-use efficiency and protect water quality
Provedor de dados: 18
Autores: Lentz, Rodrick D.; Sojka, Robert E.; Robbins, Charles W.; Kincaid, Dennis C.; Westermann, Dale T.
Tipo: Article
Palavras-chave: Polyacrylamide; Water-soluble PAM (WSPAM); Polyacrylamide; Nutrients; Practical farm efficiency; Mass Import - autoclassified (may be erroneous).
Ano: 2001
URL: http://eprints.nwisrl.ars.usda.gov/123/1/1045.pdf

Nutrient losses in surface irrigation runoff
Provedor de dados: 18
Autores: Bjorneberg, D.L.; Westermann, D.T.; Aase, J.K.
Tipo: Article
Palavras-chave: Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 2002
URL: http://eprints.nwisrl.ars.usda.gov/146/1/1088.pdf

Reducing phosphorus losses from surface-irrigated fields: emerging polyacrylamide technology
Provedor de dados: 18
Autores: Lentz, R.D.; Sojka, R.E.; Robbins, C.W.
Tipo: Article
Palavras-chave: Nutrients; Water-soluble PAM (WSPAM); Mass Import - autoclassified (may be erroneous).
Ano: 1998
URL: http://eprints.nwisrl.ars.usda.gov/694/1/962.pdf

Percolation phosphorus losses in calcareous furrow-irrigated soils
Provedor de dados: 18
Autores: Lentz, R.D.; Westermann, D.T.
Tipo: Conference or Workshop Item
Palavras-chave: Nutrients; Nutrient losses; Calcareous soil; Phosphorous; Mass Import - autoclassified (may be erroneous).
Ano: 2001
URL: http://eprints.nwisrl.ars.usda.gov/926/1/1038.pdf

Sediment-Phosphorus Relations in Surface Runoff from Irrigated Lands
Provedor de dados: 18
Autores: Carter, D.L.; Brown, M.J.; Bondurant, J.A.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 1976
URL: http://eprints.nwisrl.ars.usda.gov/938/1/351.pdf

Biochar Usage:  Pros and Cons
Provedor de dados: 18
Autores: Ippolito, J.A.; Lentz, R.D.; Novak M, J; Spokas, K.A.; Collins, H.P.; Streubel, J.
Soil fertility benefits of charcoal application have been reported as early as 1847 indicating that plant nutrients are sorbed within charcoal pores.  The use of biomass-derived black carbon or biochar, the solid byproduct from the pyrolysis processing of any organic feedstock, has garnered recent attention as a potential vehicle for carbon sequestration and a beneficial soil conditioner.  However, most of the past biochar research has focused on improving the physico-chemical properties of tropical (i.e. terra preta) and highly weathered soils, while little research has focused on improving arid or semi-arid soils of the USA.  Here, we present an overview of the potential benefits and drawbacks of biochar usage in western US agro-ecosystems based on...
Tipo: Article
Palavras-chave: Soil quality; Nutrients.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1522/1/1484.pdf

Reducing soil and nutrient losses from furrow irrigated fields with polymer applications
Provedor de dados: 18
Autores: Lentz, R.D.; Sojka, R.E.; Robbins, C.W.
Tipo: Book Section
Palavras-chave: Nutrients; Chemistry; Mass Import - autoclassified (may be erroneous).
Ano: 1998
URL: http://eprints.nwisrl.ars.usda.gov/808/1/969.pdf

Colloidal phosphorus in surface runoff and water extracts from semiarid soils of the Western United States
Provedor de dados: 18
Autores: Turner, Benjamin L.; Kay, Mary A.; Westermann, Dale T.
Tipo: Article
Palavras-chave: Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 2004
URL: http://eprints.nwisrl.ars.usda.gov/1/1/1127.pdf

Phosphorus loss with surface irrigation
Provedor de dados: 18
Autores: Bjorneberg, D.L.; Leytem, A.B.
Tipo: Technical Bulletin
Palavras-chave: Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 2005
URL: http://eprints.nwisrl.ars.usda.gov/1203/1/1156.pdf

Delayed sample filtration and storage effects on dissolved nutrients measured in agricultural runoff
Provedor de dados: 18
Autores: Lentz, R.D.
Standard water quality analysis methods recommend that sediment-laden runoff waters sampled to determine dissolved nutrient concentrations be filtered immediately after collection.  Few research studies have examined the influence of delayed filtration on sample stability or nutrient loss assessments.  Twenty eight runoff water volumes were collected from 3 irrigation furrows during a 12-h irrigation set.  Four subsamples of each volume were obtained; 2 were filtered (45 µm) in the field and the other 2 were filtered 10 days later, with or without boric acid treatment (1 mL saturated H3BO3 solution per 100 mL sample). All samples were refrigerated at 4 deg. C.  Dissolved reactive P (DRP), NO3-N, and NH4-N concentrations were measured in all filtered...
Tipo: Article
Palavras-chave: Nitrogen; Phosphorous; Nutrients.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1516/1/1480.pdf

Assessment of Phosphorus Retention in   Irrigation Laterals
Provedor de dados: 18
Autores: Ippolito, J.A.; Nelson, N.O.
Irrigation  laterals  transport  irrigation  return  flow,  including  water,  sediment, and dissolved nutrients, such as phosphorus (P), back to surface water bodies. Phosphorus transformations during transport can affect both P bioavailability and the best management practices selected to minimize P inputs to waters of the United States. The objective of this study  was  to  determine  P  retention  in  three  irrigation  laterals.  Soluble  reactive  P  (SRP) concentrations in lateral waters were increased from 0.08 to 0.25 mg L -1  (0.08 to 0.25 ppm) by constantly injecting a phosphate (PO4) solution for 2.5 hours. Bromide (Br) was used as a conservative tracer to determine dilution effects. Water was sampled at 10-minute intervals, beginning 30...
Tipo: Article
Palavras-chave: Drainage water (see Percolation water); Nutrients.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1513/1/1477.pdf

Soil and Nutrient Losses from Small Sprinkler and Furrow Irrigated Watersheds in Southern Idaho
Provedor de dados: 18
Autores: Bjorneberg, D.L.; King, B.A.; Nelson, Nathan; Lee, J.H.
Sediment and associated nutrients flowing to the Snake River with furrow irrigation runoff and unused irrigation water have been a concern in the Twin Falls irrigation tract in southern Idaho. Converting furrow irrigated fields to sprinkler irrigation is one practice that has been promoted, and received financial assistance, to reduce sediment loss. Five small watersheds (330 to 1480 acres) with 10 to 70% sprinkler irrigation were monitored from 2005 to 2008 to determine if converting to sprinkler irrigation reduced sediment and nutrient losses from these watersheds. Eliminating runoff from furrow irrigated fields by converting to sprinkler irrigation will reduce sediment and nutrient losses from fields. However, there were no significant correlations...
Tipo: Conference or Workshop Item
Palavras-chave: Runoff losses; Nutrient losses; Nutrients; Sediment.
Ano: 2009
URL: http://eprints.nwisrl.ars.usda.gov/1587/1/1544.pdf

Furrow irrigation and N management strategies to protect water quality
Provedor de dados: 18
Autores: Lehrsch, Gary A.; Sojka, R.E.; Westermann, D.T.
Tipo: Article
Palavras-chave: Erosion; Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 2001
URL: http://eprints.nwisrl.ars.usda.gov/122/1/1044.pdf

Phosphorus losses from an irrigated watershed in the Northwestern U.S.: Case study of the Upper Snake Rock Watershed
Provedor de dados: 18
Autores: Bjorneberg, D.L.; Leytem, A.B.; Ippolito, J.A.; Koehn, A.C.
Watersheds utilizing surface water for irrigation often return a portion of the water to a water body. This irrigation return flow often includes sediment and nutrients that reduce the quality of the receiving water body. Research in the 82,000 ha Upper Snake Rock (USR) watershed from 2005 to 2008 showed that, on average, water diverted from the Snake River annually supplied 547 kg/ha of total suspended sediment (TSS), 1.1 kg/ha of total phosphorus (TP) and 0.50 kg/ha of dissolved phosphorus (DP) to the irrigation tract. Irrigation return flow from the USR watershed contributed 414 kg/ha of TSS, 0.71 kg/ha of TP and 0.32 kg/ha of DP back to the Snake River. Significantly more TP flowed into the watershed than returned to the Snake River while there was no...
Tipo: Article
Palavras-chave: Irrigation control; Nutrients.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1586/1/1543.pdf

Reducing nutrient losses in runoff from furrow irrigation
Provedor de dados: 18
Autores: Lentz, R.D.; Westermann, D.T.; Lehrsch, G.A.
Few studies have comprehensively examined nutrient losses in runoff from furrow-irrigated fields, but the rising cost of fertilizer and finite nature of the resource encourages further research.  A 2-yr experiment measured runoff losses of sediment, particulate P and N, and dissolved NO3-N, NH4-N, K, and reactive P (DRP) from fertilized, manured, or non-amended fields.  Average nutrient losses were substantial, including 15.6 lbs ac/yr dissolved N, P, and K and 73.6 lbs ac/yr particulate N and P. The cost or replacing these nutrients with inorganic fertilizers was not trivial, at $54.69 ac/yr.  Relative to non-amended soil, manure increased dissolved K, NO3-N, and DRP in runoff by 2.1x, 1.5x, and 2.7x, respectively. Other experiments evaluated the...
Tipo: Conference or Workshop Item
Palavras-chave: Furrow irrigation; Runoff losses; Nutrients; Sediment.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1518/1/1482.pdf

Occurence of harmful dinoflagellates in the punic harbors of Carthage (Gulf of Tunis) and their correlations with the physicochemical parameters
Provedor de dados: 20
Autores: Aissaoui, A.; Turki, S.; Ben Hassine, O. K.
Afin de fournir une meilleure idée sur la structure et la dynamique de la communauté des dinoflagellés et leurs relations avec les paramètres environnementaux dans les zones semi-fermées en communication avec le golfe de Tunis, une étude a été réalisée dans les ports puniques de Carthage afin d’estimer les densités et la dynamique des espèces de dinoflagellés ainsi que les variations des concentrations en nutriments, de janvier à juin 2006. Un nombre de 66 espèces de dinoflagellés ont été identifiés dont 14 espèces sont connues pour être nocives et responsables d’efflorescences nuisibles alors que 21 espèces sont connues pour être productrices de toxines. L'analyse statistique nous a permis de révéler des corrélations significatives entre les densités de...
Tipo: Journal Contribution
Palavras-chave: Parameters; Nutrients (mineral); Coastal environment; Plankton; Nutrients; Plankton.
Ano: 2012
URL: http://hdl.handle.net/1834/5318

Estudios limnológicos en lagos y lagunas del Parque Nacional Torres del Paine (51°S, Chile)
Provedor de dados: 20
Autores: Soto, Doris; De los Ríos, Patricio.
La Patagonia de Chile posee muchos ecosistemas acuáticos sin contaminación, dentro de estos ecosistemas hay muchos lagos y lagunas prístinos. En este estudio, se analizó información colectada entre los años 1989 y 1990 (sin publicar y sin publicar) sobre lagos y lagunas del Parque Nacional Torres del Paine, un área sin contaminar en el sur de Chile (51° S). Se aplicó un análisis de componentes principales considerando parámetros químicos, riqueza de especies zooplanctónicas y biomasa. Los resultados denotaron que las concentraciones de cationes (Ca, Na y Mg), cloruros, seston y clorofila, junto con biomasa de zooplancton y riqueza de especies zooplanctónicas fueron las principales variables que contribuyeron al modelo obtenido. Según este modelo, se...
Tipo: Journal Contribution
Palavras-chave: Lakes; Ponds; Chlorophylls; Zooplankton; Nutrients; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2009
URL: http://hdl.handle.net/1834/4167

Algunas características del florecimiento del fitoplancton en el frente del Río de la Plata. I. Los sistemas nutritivos
Provedor de dados: 20
Autores: Negri, R.M.; Carreto, J.I.; Benavides, H.R.
During the spring (H-04/82: october 11-27, 1982)carried out by the Fishery Research Vessel "Dr.E.Holmberg", the distribution of temperature, salinity, nutrients concentration and photosynthetic pigments were studied at the "Rio de la Plata" maritime front. The presence of Sub-Tropical coastal waters in only station did not allow its characterization. Low Chlorophyll a concentration were noted, in association with scarce concentrations of nutrients and high Margalef index values.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Abiotic factors; Water masses; Phosphates; Silicates; Nitrates; Chlorophylls; Estuarine front; Phytoplankton; Nitrates; Nutrients; Phosphates; Silicates; Chlorophylls.
Ano: 1986
URL: http://hdl.handle.net/1834/2041

Nitrogen and phosphorus species of Lake Burullus Water (Egypt)
Provedor de dados: 20
Autores: Okbah, M.A.
Water samples collected from Lake Burullus were analyzed to investigate temporal and spatial variations of phosphorus and nitrogen species during the period from January to October 2003. The concentrations of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), particulate nitrogen (PN) and total nitrogen (TN) were in the ranges of 4.10-107.51mole l-1 ; 7.43-170.10mole l-1; 9.33-209.4mole l-1 and 51.40-259.0 mole l-1 respectively. DIN, DON and PN species represent 19%, 34% and 47% of the total nitrogen content, respectively. Significant variations for the concentrations of the phosphorus forms have been found in this study. Concentrations of reactive phosphate (PO4), dissolved organic phosphorus (DOP), particulate phosphorus (PP) and...
Tipo: Journal Contribution
Palavras-chave: Water samples; Water content; Nitrogen; Nutrients; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2005
URL: http://hdl.handle.net/1834/1263

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Romdhane, M.S.; Chebil Ajjabi, L.; El Abed, O.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel fisheries; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater treatment; Water quality; Mytilus galloprovincialis; Wastewater treatment; Mussels; Nutrients; Http://aims.fao.org/aos/agrovoc/c_31155; Http://aims.fao.org/aos/agrovoc/c_25312; Http://aims.fao.org/aos/agrovoc/c_5010; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2008
URL: http://hdl.handle.net/1834/4154

Effect of Frequency of Fertilisation on Abundance of Rotifers and Protozoa in Flooded Ponds and Simulation Tanks
Provedor de dados: 20
Autores: Kyewalyanga, M.S.; Mwandya, A.W.
Experiments to assess a suitable rate of fertilisation of earthen ponds for production of rotifers and protozoa were conducted in April 2000. Production of rotifers and protozoa (hereinafter collectively referred to as rotifers) was stimulated by flooding the ponds using seawater and rainfall. In the simulations, seawater diluted to 20 ppt salinity activated initial production. In all systems, the fertiliser concentration was approximately 1 ml of chicken manure to 2 litres of seawater. Three different rates of fertilisation were tested. The results clearly showed that the higher the frequency of addition of manure, the higher the production of rotifers per ml. Fertilised ponds had maximum averages of between 64 and 76 rotifers/ml as compared to a maximum...
Tipo: Journal Contribution
Palavras-chave: Rotifers; Fertilisation rate; Earthen ponds; Nutrients; Simulatioru.
Ano: 2002
URL: http://hdl.handle.net/1834/22

Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania
Provedor de dados: 20
Autores: Lyimo, T.J.; Hamisi, M.I.; Muruke, M.H.S.
We report on the occurrence and diversity of cyanobacteria in intertidal seagrass meadows at Ocean Road and Mjimwema, Dar es Salaam, Tanzania. Nutrients, temperature and salinity were measured as comparative environmental factors. A total of 19 different cyanobacteria taxa were encountered, out of which eight were found exclusively in Mjimwema, four exclusively in Ocean Road and seven were common to both sites. Oscillatoria, Lyngbya and Spirulina were the dominant cyanobacterial genera. Cyanobacterial coverage was higher in Mjimwema (31–100%) than in Ocean Road (0–60%). The levels of nutrients in tidal pool waters at Ocean Road ranged from 0.45–1.03 ìmol NO3 -N/l, 0.19–0.27 ìmol NO2 -N/l and 0.03–0.09 ìmol PO4 -P/l. At Mjimwema the nutrient concentration...
Tipo: Journal Contribution
Palavras-chave: Sea grass; Salinity; Temperature; Bacteria; Nutrients; Salinity; Temperature; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2004
URL: http://hdl.handle.net/1834/1137

Coralline Algae, Important Coral-reef Builders Threatened by Pollution
Provedor de dados: 20
Autores: Mohammed, S.M.; Björk, M.; Björklund, M.; Semesi, A.
The release of inorganic nutrients into the sea by domestic sewage is a major threat to many marine systems. This eutrophication affects coral-reef organisms indirectly by increased growth of microalgae, leading to increased sedimentation, decreased light availibility, rapid growth of opportunistic macroalgae, etc. In this paper, we report a decrease in the cover of important group of coral-reef builders, the coralline algae. This decrease might be caused by the outlets of sewage water from Zanzibar town. Laboratory and field experiments show that both the growth rate and the calcification of these organisms are negatively affected by high phosphate levels, but not by nitrate or ammonia.
Tipo: Journal Contribution
Palavras-chave: Sewage; Algae; Eutrophication; Coral reefs; Nutrients; Environmental degradation; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_34821.
Ano: 1995
URL: http://hdl.handle.net/1834/302

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Chebil Ajjabi, L.; Romdhane, M.S.; El Abed, A.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel culture; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater recycling; Wastewater treatment; Water quality; Fish; Nitrogen; Phosphorus; Water quality; Mussels; Nutrients; Bacteria; Chlorophylls; Density; Effluents; Filtration; Wastewater treatment.
Ano: 2008
URL: http://hdl.handle.net/1834/3756

First IODE Workshop on Quality Control of Chemical Oceanographic Data Collections IOC Project Office for IODE, Oostende, Belgium 8-11 February 2010
Provedor de dados: 20
The IODE workshop on quality control (QC) of chemical oceanographic data collections was held at the IOC Project Office for IODE in Oostende, Belgium between 8 and 11 February 2010. The meeting, proposed and organized by the IODE Group of Experts on Biological and Chemical Data Management and Exchange Practices (GE-BICH), welcomed 19 experts in chemical data management as well as data producers and users from 13 countries. The objective of the workshop was to evaluate existing procedures and define a minimum set of QC tests and criteria for dissolved inorganic nutrients (phosphate, silicate, nitrate+nitrite, nitrate, nitrite, and ammonium) and dissolved oxygen in seawater. The meeting produced several outcomes. First, the meeting identified two proposals...
Tipo: Report
Palavras-chave: Oceanographic data; Workshops; Nutrients; Http://aims.fao.org/aos/agrovoc/c_26838; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2010
URL: http://hdl.handle.net/1834/4312

Developmental expansion of the hilum in chickpea seed coats
Provedor de dados: 30
Autores: Kriseman,M.L.
Palavras-chave: Chickpeas; Seed treatment; Crossing over; Nutrients; Mass media; Biological development; Fruits; Area; Biological phenomena; Diseases.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3335

Diagnostics of Sorghum and Pearl Millet grains-based nutrition in India
Provedor de dados: 30
Autores: Rao, P.P.
Palavras-chave: Millets; Sorghum; Nutrient intake; Zinc; Cereals; Grain legumes; Proteins; Iron; Nutrients; Vitamins.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3199

Food security in nutrient-stressed environments: exploiting plants' genetic capabilities
Provedor de dados: 30
Autores: J.J.
Palavras-chave: Exudates; Pigeonpeas; Genotypes; Nutrients; Genes; Nutrient uptake; Genetic engineering; Cell walls; Phosphate fertilizers; Cropping systems.
Ano: 1999
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4202

Phosphate and potash fertilization on Acacia mearnsii De Wild. (Black wattle) plantation.
Provedor de dados: 190
Autores: Andrade, Guilherme de Castro; Bellote, Antonio Francisco Jurado; Ferreira, Carlos Alberto; Silva, Helton Damin da.
Acacia mearnsii is the third forest species more planted in Brazil, especially in small farms at Rio Grande do Sul State. The species is also known as black wattle and is important as a source of tannin, timber, pulpwood and rayon. Its fast growth results in high demand of nutrients and fertilization is necessary to keep site productivity. In this paper it is reported the results of the application of four doses of Phosphorous (0, 20, 40, 80g/tree as P2O5) and three of Potassium (0, 20, 40g/tree as K2O), in a factorial designed trial established on a chemically poor soil at the region of Ponta Grossa, State of Paraná, Brazil. Trees were implanted in a 3m X 2m spacing with 35 plants per plot. The fertilizers were applied in furrows between the rows at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reforestation; Fertilization; Nutrients; Phosphorous; Potassium; Wood productivity Reflorestamento; Fertilização; Nutrientes; Fósforo; Potássio; Produtividade de madeira.
Ano: 2004
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1596

Efeitos da adubação fosfatada e da aplicação de resíduo de celulose no crescimento de Eucalyptus dunnii
Provedor de dados: 190
Autores: Andrade, Guilherme de Castro; Silva, Helton Damin da; Bellote, Antonio Francisco Jurado; Ferreira, Carlos Alberto.
No Brasil, os plantios de árvores de rápido crescimento, principalmente espécies de Eucalyptus e de Pinus, representam uma oferta de milhares de empregos e significativa contribuição ao PIB. Do ponto de vista ambiental, contribuem para reduzir a pressão sobre as florestas nativas, concorrendo assim para a sua preservação e a dos recursos naturais nelas existentes. Esses povoamentos florestais, implantados na sua maioria em solos de baixa fertilidade, apresentam altas taxas de crescimento, necessitando de quantidades significativas de água e nutrientes do solo, o que causa preocupações com a sustentabilidade desses sistemas e com a necessidade de reposição futura de nutrientes. A utilização de resíduos para esta finalidade é considerada prioritária. Neste...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reflorestamento; Fertilização; Nutrientes; Fósforo; Produtividade de madeira Reforestation; Fertilization; Wastes; Nutrients; Phosphorous; Wood productivity.
Ano: 2003
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1607

Sourgrass densities affecting the initial growth and macronutrient content of coffee plants
Provedor de dados: 87
Autores: Carvalho,L.B; Alves,P.L.C.A; Bianco,S.
The objective of this work was to evaluate the coexistence effects of coffee (Coffea arabica) with densities of sourgrass (Digitaria insularis) on crop macronutrient content and plant growth. The experiment was conducted in plots where one coffee plant was maintained in coexistence with 0 (weed-free check), 1, 2, 4, 8, and 16 sourgrass plants, using a completely randomized design with three replicates. Reduction of coffee growth and macronutrient content, except P that increased, started when the coexistence occurred with sourgrass plants in a density of 1 plant per plot. In general, macronutrient content was reduced by 18-50%, while growth characteristics were reduced by 9-41%, when coffee plants coexisted with 16 plants of sourgrass. Thus, sourgrass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Digitaria insularis; Competition; Additive experiment; Nutrients.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100012

Assessing the Competitive Ability of Rhynchosia capitata; an Emerging Summer Weed in Asia
Provedor de dados: 87
Autores: Ali,H.H.; Tanveer,A.; Naeem,M.; Jamil,M.; Iqbal,M.; Chadhar,A.R.; Kashif,M.S.
Rhynchosia capitata is a newly emerging threatening weed of summer crops in many Asian countries. We conducted 2-yr experiments to evaluate R. capitata competition with mungbean under irrigated conditions. Rhynchosia capitata was allowed to compete with mungbean for 0, 3, 4, 5, 6, 7 weeks after planting and for full crop season. The competitive ability of R. capitata was assessed by measuring its dry weight, micro and macro nutrient contents and uptake; and its effects on mungbean growth and yield parameters. The results showed that full season weed competition produced highest dry weight of R. capitata and its macro and micronutrient contents and uptake. Yield and yield components of mungbean decreased in a linear fashion with increase in competition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhynchosia capitata; Emerging; Infestation; Competition; Mungbean; Nutrients.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200175

Expanding biogas on UK dairy farms: a question of scale
Provedor de dados: 31
Autores: Butler,   Allan J.; Hobbs,   Phil; Winter,   Michael.
Expanding Anaerobic Digestion (AD) in the UK will not only depend upon finding appropriate economic structures to support on‐farm developments but also an appreciation of environmental issues such as less Greenhouse Gas (GHG) emissions; reduced use of artificial fertilisers; and better management of farm wastes. At the core of this paper is the Anaerobic Digestion Analytical Model (ADAM) that examines the economic and environmental impacts of integrating AD into UK farming systems. However, the average dairy farm in the UK is not of sufficient size to enable profitable biogas production. Indeed, farm size, as represented by FBS/FAS data used in ADAM, needs to be scaled by three to four times for a biogas enterprise to break‐even. To boost profitability,...
Tipo: Conference Paper or Presentation
Palavras-chave: Anaerobic digestion; Biogas; Dairy farming; Carbon dioxide; Nutrients; Digestate; Environmental Economics and Policy; Farm Management.
Ano: 2011
URL: http://purl.umn.edu/108937

Fast Food, Addiction, and Market Power
Provedor de dados: 31
Autores: Richards,   Timothy J.; Patterson,   Paul M.; Hamilton,   Stephen F.
Many attribute the rise in obesity since the early 1980's to the overconsumption of fast food.  A dynamic model of a different-product industry equilibrium shows that a firm with market power will price below marginal cost in a steady-state equilibrium.  A spatial hedonic pricing model is used to test whether fast food firms set prices in order to exploit their inherent addictiveness.  The results show that firms price products dense in addictive nutrients below marginal cost, but price products high in nonaddictive nutrients higher than would be the case in perfect competition.
Tipo: Journal Article
Palavras-chave: Addiction; Brand loyalty; Fast food; Generalized method of moments; Hedonic pricing; Nutrients; Shadow values; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2007
URL: http://purl.umn.edu/7077

NUTRIENT EFFECTS ON CONSUMER DEMAND: A PANEL DATA APPROACH
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Gil,   Jose Maria; Angulo,   Ana Maria.
The objective of this paper is to analyze the Spanish demand for food taking into account the consumer's concern about the relationship between food diet and health.  This concern is forcing food demand analysts to assume that consumer utility is a function of nutrients instead of simply the food products themselves.  A CBS demand model has been considered to model the new demand function obtained, which is estimated with a complete panel data set.  Ten broad categories, nine nutrients and the most relevant socio-economic variables have been considered.  Finally, after an appropriate model selection strategy, expenditure, price and nutrient elasticities, as well as main sociodemographic effects, have been calculated.
Tipo: Conference Paper or Presentation
Palavras-chave: Nutrients; Demand for food; CBS; Panel data; Spain.; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2003
URL: http://purl.umn.edu/25881

Towards Design For a Nutrient Trading Programme to Improve Water Quality in Lake Rotorua
Provedor de dados: 31
Autores: Kerr,   Suzi; Lauder,   Glen; Fairman,   David.
This paper explores how to enhance the role for academic research (natural sciences, economics and their integration; and stakeholder management) within the development and implementation of water quality policy in New Zealand. Our focus is on the use of market based instruments and particularly nutrient trading programmes, which are one important part of the potential tool kit to address these issues. We discuss why nutrient trading might be an appropriate instrument for the Lake Rotorua catchment. We survey the existing literature and then outline the outstanding scientific, economic and governance questions that need to be addressed to design an effective trading programme. Finally we discuss how to design a process to address these questions drawing on...
Tipo: Conference Paper or Presentation
Palavras-chave: Water quality; Emissions trading; Non-point source pollution; Nutrients; Rotorua; Communication; Learning; Resource /Energy Economics and Policy; Q53; Q57; Q58; A12.
Ano: 2007
URL: http://purl.umn.edu/9462

Dietary Assessment of Major Trends in U.S. Food Consumption, 1970-2005
Provedor de dados: 31
Autores: Wells,   Hodan Farah; Buzby,   Jean C.
This report examines major trends in the amount of food available for consumption in the United States between 1970 and 2005 using data from the ERS Food Availability (Per Capita) Data System. The report also estimates whether Americans are meeting Federal dietary recommendations for each of the major food groups by comparing the data with dietary recommendations in the 2005 Dietary Guidelines for Americans and the MyPyramid Food Guidance System. Findings show that Americans do not meet the Federal dietary recommendations. In order to meet them, Americans would need to substantially lower their intake of added fats, refined grains, and added sugars and sweeteners and increase their consumption of fruits, vegetables, whole grains, and lowfat milk and milk...
Tipo: Report
Palavras-chave: Agriculture; Added fats and oils; Added sugars and sweeteners; Dairy; Dietary Guidelines for Americans; Dietary recommendations; Eggs; Food; Food consumption; Fruits; Meat; MyPyramid Food Guidance System; Nutrients; Grains; Nuts; Vegetables.; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety.
Ano: 2008
URL: http://purl.umn.edu/58641

Rural-urban food, nutrient and virtual water flows in selected West African cities
Provedor de dados: 31
Autores: Drechsel,   Pay; Graefe,   Sophie; Fink,   Michael.
Impacts of increasing population pressure on food demand and land and water resources have sparked interest in nutrient and water balances and flows at a range of scales. In IWMI Research Report 115, it was tried for the first time to quantify rural-urban food flows for selected cities in Ghana and Burkina Faso to analyse their dependency on food supplied from rural vs. peri-urban vs. urban farming. Both, the urban nutrient and water footprints are closely interlinked. Currently, 80-95 percent of the domestic water used and the nutrients consumed go to waste without treatment or resource recovery. The economic dimensions are significant. Options to reduce the environmental burden by closing the rural-urban water and nutrient cycles are discussed.
Tipo: Report
Palavras-chave: Food consumption; Water quality; Nutrients; Urban agriculture; Food production; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Land Economics/Use.
Ano: 2007
URL: http://purl.umn.edu/44518

CONFINED ANIMAL PRODUCTION AND MANURE NUTRIENTS
Provedor de dados: 31
Autores: Gollehon,   Noel R.; Caswell,   Margriet; Ribaudo,   Marc; Kellogg,   Robert L.; Lander,   Charles; Letson,   David.
Census of agriculture data were used to estimate manure nutrient production and the capacity of cropland and pastureland to assimilate nutrients. Most farms (78 percent for nitrogen and 69 percent for phosphorus) have adequate land on which it is physically feasible to apply the manure produced onfarm at agronomic rates. (The costs of applying manure at these rates have not been assessed). Even so, manure that is produced on operations that cannot fully apply it to their own land at agronomic rates accounts for 60 percent of the Nation's manure nitrogen and 70 percent of the manure phosphorus. In these cases, most counties with farms that produce "excess" nutrients have adequate crop acres not associated with animal operations, but within the county, on...
Tipo: Report
Palavras-chave: Manure; Nutrients; Manure nutrients; Animal waste; Confined livestock; Confined animal feeding operation; CAFO; Feedlot beef; Dairy cows; Swine; Poultry; Animal unit; Manure nitrogen; Manure phosphorus; Water quality; Livestock Production/Industries.
Ano: 2001
URL: http://purl.umn.edu/33763

An Index to Measure Health Status
Provedor de dados: 31
Autores: Lee,   Jonq-Ying; Rampersaud,   Gail S.; Brown,   Mark G.
In this study we developed a health status index using the commonly recorded health measures by doctors and hospitals.  This health status index has a minimum possible value of 7 (the least healthy) and a maximum value of 21 (the healthiest).  Using the NHANES data, we explored the relationship of this health status index and nutrient intakes, lifestyle, and demographics of the respondent.  Regression results showed that as the age of the respondent, being non-Hispanic black, participants of food stamp programs, high percent of calories that came from fat intakes, high percent of calories in beverages that came from soft drinks, smoking, and on special diets are negatively related to the value of the health status index (i.e., the person became less...
Tipo: Report
Palavras-chave: Health index; HNANES; Nutrients; Food Consumption/Nutrition/Food Safety.
Ano: 2008
URL: http://purl.umn.edu/36819

Obesity and Nutrient Consumption: A Rational Addiction?
Provedor de dados: 31
Autores: Richards,   Timothy J.; Patterson,   Paul M.; Tegene,   Abebayehu.
Widespread obesity in the U.S. is a relatively recent phenomenon, reaching epidemic proportions only in the last 15 years. However, existing research shows that while calorie expenditure through physical activity has not changed appreciably since 1980, calorie consumption has risen dramatically. Consequently, any explanation of obesity must address the reason why consumers tend to overeat in spite of somewhat obvious future health implications. This study tests for an addiction to food nutrients as a potential explanation for the obesity epidemic. Specifically, we use a random coefficients (mixed) logit model applied to household scanner data to test a multivariate version of the rational addiction model of Becker and Murphy and Chaloupka. We find evidence...
Tipo: Working or Discussion Paper
Palavras-chave: Addiction; Demand; Mixed logit; Nutrients; Obesity.; Food Consumption/Nutrition/Food Safety.
Ano: 2004
URL: http://purl.umn.edu/28539

FAT TAX: A POLITICAL MEASURE TO REDUCE OVERWEIGHT? THE CASE OF GERMANY
Provedor de dados: 31
Autores: Thiele,   Silke.
Using an Almost Ideal Demand System food price elasticities for German households are calculated. These elasticities serve as a basis to simulate the effect of the substitutions of different food types due to a tax on saturated fat. The change of food structure causes effects on the energy and nutrient supply of individuals as well as, on consumer welfare. These effects are analyzed for different German household groups. It is found that decreases in energy and fat intake are small but potentially effective especially for low-income households. However, due to the collateral decrease of nutrients which Germans have deficient supply of, the total health effects of a fat tax remain unclear. Furthermore the results show that low-income groups would bear...
Tipo: Conference Paper or Presentation
Palavras-chave: Fat tax; Foods; Nutrients; Welfare effects; Almost Ideal Demand System; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; D12; Q18; P46; I12.
Ano: 2010
URL: http://purl.umn.edu/116393

Effects of food prices and consumer income on nutrient availability: An application of the demand for dairy products in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Laajimi,   Abderraouf.
Number of Tunisian food demand studies have measured the influence of traditional variables, such as income and prices, and in some cases some socio-demographic variables. However, given increasing concerns about health, other important factors, such as the nutritious quality and the nutrient content of food, have also been shown to determine consumer choices. This paper analyses the effect of these factors on the demand for dairy products. The nutritious quality of dairy products is measured by an index that relates nutrient content of each product with the standards suggested by the National Academy of Science. A demand system is estimated and nutrient demand elasticities with respect to prices and expenditure are obtained. Results differ from...
Tipo: Journal Article
Palavras-chave: Dairy products demand; Health awareness; Nutrients; Price/quality index; Tunisia; Agricultural and Food Policy; D12; I12.
Ano: 2009
URL: http://purl.umn.edu/57279

An Evaluation of Nutrient Trading Options in Virginia: A Role for Agriculture?
Provedor de dados: 31
Autores: Stephenson,   Kurt; Aultman,   Stephen; Metcalfe,   Todd; Miller,   Alex.
Tipo: Conference Paper or Presentation
Palavras-chave: Water Quality Trading; Offsets; Nutrients; Agriculture; BMPs; Environmental Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/46779

Water quality trading programs: A comparison between the Northern and Southern Hemispheres
Provedor de dados: 31
Autores: Greenhalgh,   Suzie; Selman,   Mindy.
Water quality trading is continually being explored and implemented to improve water quality in many parts of the world. They are being used to cost-effectively reduce point and/or non-point source obligations to meet water quality goals such as nutrient discharge limits. A comparison between evolving trading programs in New Zealand and some in North America illustrate a number of differences as well as similarities in terms of the successes and hurdles. These can be used to better design more effective programs.
Tipo: Conference Paper or Presentation
Palavras-chave: Water quality; Trading; Nutrients; Market-based; Non-point source; Point source; Environmental Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6028

Digestibility and Physicochemical Characteristics of Tambaqui Waste Biological Silage Meal Included in Commercial Layer Diets*
Provedor de dados: 89
Autores: Guimarães,CC; Silva,AJI; Cruz,FGG; Rufino,JPF; Silva,AF; Costa,VR.
ABSTRACT This study aimed at evaluating the effects of the physicochemical and nutritional characteristics of a biological silage meal made of tambaqui waste on dietary nutrient apparent digestibility and energy metabolism of commercial layer diets. Seventy-two 61-week-old Hisex White hens were assigned according to a completely randomized experimental design in two treatments: control diet and diet with 5% tambaqui waste biological silage meal (TWBSM), with six replicates of six birds each. The ensiled biomass presented grey brown color, acid aroma, viscous texture, 5.27±0.016pH, 96.28% dry matter (DM), 33.29% crude protein (CP), 33.65% ether extract (EE), 14.37% ashes, 13.63% non-nitrogen extract (NNE), 65.16 g.kg-1 calcium (Ca), 22.90 g.kg-1 phosphorus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative food; Fish waste; Metabolizable energy; Nutrients; Silage.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300321

HEAVY METALS AND MICRONUTRIENTS IN THE SOIL AND GRAPEVINE UNDER DIFFERENT IRRIGATION STRATEGIES
Provedor de dados: 90
Autores: Oliveira,Vanessa de Souza; Lima,Augusto Miguel Nascimento; Salviano,Alessandra Monteiro; Bassoi,Luís Henrique; Pereira,Giuliano Elias.
Soils under natural conditions have heavy metals in variable concentrations and there may be an increase in these elements as a result of the agricultural practices adopted. Transport of heavy metals in soil mainly occurs in forms dissolved in the soil solution or associated with solid particles, water being their main means of transport. In this context, the aim of this study was to evaluate the heavy metal and micronutrient content in the soil and in the grapevine plant and fruit under different irrigation strategies. The experiment was carried out in Petrolina, PE, Brazil. The treatments consisted of three irrigation strategies: full irrigation (FI), regulated deficit irrigation (RDI), and deficit irrigation (DI). During the period of grape maturation,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water availability; Nutrients; Grape.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100162

Quality of surface water related to land use: a case study in a catchment with small farms and intensive vegetable crop production in southern Brazil
Provedor de dados: 90
Autores: Ribeiro,Karina Hacke; Favaretto,Nerilde; Dieckow,Jeferson; Souza,Luiz Cláudio de Paula; Minella,Jean Paolo Gomes; Almeida,Luciano de; Ramos,Michele Ribeiro.
Water degradation is strongly related to agricultural activity. The aim of this study was to evaluate the influence of land use and some environmental components on surface water quality in the Campestre catchment, located in Colombo, state of Parana, Brazil. Physical and chemical attributes were analyzed (total nitrogen, ammonium, nitrate, total phosphorus, electrical conductivity, pH, temperature, turbidity, total solids, biological oxygen demand, chemical oxygen demand and dissolved oxygen). Monthly samples of the river water were taken over one year at eight monitoring sites, distributed over three sub-basins. Overall, water quality was worse in the sub-basin with a higher percentage of agriculture, and was also affected by a lower percentage of native...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water pollution; Agriculture; Nutrients; Micro watershed.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200030

Chemical properties of soils treated with biological sludge from gelatin industry
Provedor de dados: 90
Autores: Guimarães,Rita de Cássia Melo; Cruz,Mara Cristina Pessôa da; Ferreira,Manoel Evaristo; Taniguchi,Carlos Alberto Kenji.
The impact of agro-industrial organic wastes in the environment can be reduced when used in agriculture. From the standpoint of soil fertility, residue applications can increase the organic matter content and provide nutrients for plants. This study evaluated the effect of biological sludge from gelatin industry on the chemical properties of two Ultisols (loamy sand and sandy clay) and an Oxisol (clay). The experiment lasted 120 days and was carried out in laboratory in a completely randomized design with factorial arrangement, combining the three soils and six biological sludge rates (0, 100, 200, 300, 400, and 500 m³ ha-1), with three replications. Biological sludge rates of up to 500 m³ ha-1 decreased soil acidity and increased the effective cation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste; Nutrients; Soil pH; Effective CEC.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200034

Soil fertility, organic carbon and fractions of the organic matter at different distances from eucalyptus stumps
Provedor de dados: 90
Autores: Faria,Geraldo Erli; Barros,Nairam Félix de; Novais,Roberto Ferreira; Silva,Ivo Ribeiro.
Knowledge on variations in vertical, horizontal and temporal characteristics of the soil chemical properties under eucalyptus stumps left in the soil is of fundamental importance for the management of subsequent crops. The objective of this work was to evaluate the effect of eucalyptus stumps (ES) left after cutting on the spatial variability of chemical characteristics in a dystrophic Yellow Argisol in the eastern coastal plain region of Brazil. For this purpose, ES left for 31 and 54 months were selected in two experimental areas with similar characteristics, to assess the decomposition effects of the stumps on soil chemical attributes. Soil samples were collected directly around these ES, and at distances of 30, 60, 90, 120 and 150 cm away from them, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Humic substances; Spatial variability.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000300010

Chlorophyll index for real-time prediction of nutritional status of 'Prata' banana
Provedor de dados: 91
Autores: Arantes,Alessandro de M.; Donato,Sérgio L. R.; Siqueira,Dalmo L. de; Amorim,Edson P.; Rodrigues Filho,Vagner A.
ABSTRACT This study aimed to select regression equations based on the correlation between chlorophyll index and leaf nutrient contents, for real-time prediction of the nutritional status of 'Prata' banana. Six cultivars of 'Prata' banana were used as treatments, with five replicates and four plants per plot, arranged in a completely randomized design. Nutrient levels were evaluated based on laboratorial analysis and chlorophyll indices using a portable chlorophyll meter, in the third leaf from the apex to the base. Data were subjected to analysis of variance, calculating the correlations between leaf nutrient contents and chlorophyll indices, and the regression equations were adjusted to the associations that were significant and with greater magnitude....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Cultivars; Nutrients; Chlorophyll.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000200099

Substrates and controlled-release fertilizations on the quality of eucalyptus cuttings
Provedor de dados: 91
Autores: Silva,Richardson B. G. da; Silva,Magali R. da; Simões,Danilo.
To produce cuttings with quality, the most appropriate nutritional management strategies should be sought to reduce wastage of fertilizer, while accounting for the characteristics of each substrate. This study evaluated the effect of substrates and doses of controlled-release fertilizer on the quality of Eucalyptus grandis Hill ex Maiden x Eucalyptus urophylla S. T. Blake cuttings. The substrates consisted of several mixtures: vermiculite+carbonized rice chaff+coconut fibre (1:1:1); vermiculite+coconut fibre (1:1); and vermiculite+carbonized rice chaff (1:1). These mixtures were added to 2, 4, 6 and 8 kg of controlled-release fertilizer per cubic meter of substrate. The substrates that do not support root development and have lower water retention,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Fertilizer; Root system; Water retention; Forest nursery.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014001100005

Dry matter and macronutrient extraction curves of potato varieties in the Alto Paranaíba region, Brazil
Provedor de dados: 91
Autores: Silva,Carlos D. da; Soares,Maria E. P.; Ferreira,Miller H.; Cavalcante,Alian C. P.; Andrade,Guilherme A. V. de; Aquino,Leonardo A. de.
ABSTRACT Information on plant nutrient extraction is of utmost importance for the management of fertilization in crops. The objective of the study was to determine the accumulation of dry matter mass in the tubers and aerial parts of the plants and to generate absorption curves of macronutrients N, P, K, Ca and Mg for the potato varieties Ágata, Asterix, Atlantic and Taurus. The shoot and tuber samples were collected at 6, 13, 54, 66, 70, 82 and 97 days after planting. The highest accumulation of dry matter was observed in the Asterix and Atlantic varieties. The varieties Asterix and Atlantic showed higher N and K extraction and, consequently, higher productivity, while Taurus and Ágata presented lower yields and nutrient extraction. The period of greatest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Absorption; Nutrients.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000300176

Response of vegetation to sheep dung addition in a degraded Cerrado area
Provedor de dados: 91
Autores: Teixeira,Danilo S.; Rezende,Andreia A.; Lannes,Luciola S.
ABSTRACT Cerrado is the second largest biome in Brazil and is classified as a biodiversity hotspot. The establishment of hydroelectric power stations in Brazil originated degraded areas due to the removal of soil for construction of dams, in which native vegetation sometimes fails to reestablish due to the bad soil conditions. Sheep excrete most of the nutrients they ingest, such as phosphorus, calcium, potassium and nitrogen. This study aimed at investigating whether sheep dung contributes to the improvement of soil quality and stimulates the process of ecological succession in areas affected by the construction of the hydroelectric power station of Ilha Solteira. Four areas were selected, located at the Experimental Farm of Unesp Ilha Solteira/SP, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recuperation; Restoration; Nutrients.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100047

Nutrition and yield of ‘Gigante’ cactus pear cultivated with different spacings and organic fertilizer
Provedor de dados: 91
Autores: Donato,Paulo E. R.; Donato,Sérgio L. R.; Silva,João A.; Pires,Aureliano J. V.; Rosa,Raul C. C.; Aquino,Aureluci A.
ABSTRACT The objective of this study was to evaluate the levels of macronutrients in cladodes and yield of cactus pear, cv. ‘Gigante’, cultivated with different cattle manure doses and plant spacings. The experimental design was randomized blocks in 4 x 3 factorial, with three replicates. The treatments consisted of the combination of four doses of cattle manure (0, 30, 60 and 90 Mg ha-1 year-1) with three spacings (1.00 x 0.50, 2.00 x 0.25 and 3.00 x 1.00 x 0.25 m). The contents of macronutrients and dry matter production of cladodes were assessed 600 days after planting. The plant spacings influenced the contents of nitrogen, potassium, calcium and sulfur in the cladodes of ‘Gigante’ cactus pear and there was interaction between spacing and manure dose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Opuntia; Plant arrangement; Natural fertilization; Nutrients.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201083

Changes in chemical attributes of a Fluvent cultivated with castor bean and irrigated with wastewater
Provedor de dados: 91
Autores: Barreto,Aurelir N.; Nascimento,Joab J. V. R. do; Medeiros,Everaldo P. de; Nóbrega,Janiny A. da; Bezerra,Jose R. C.
Agricultural use of wastewater is an alternative to increase water availability, especially in semiarid regions. However, it may cause undesirable chemical changes in the soil. The aim of this study was to evaluate the influence of wastewater irrigation and castor bean (Ricinus communis L.) cultivation on the chemical attributes of a Fluvic Neosol. The experimental design was in a randomized block, in split-plot scheme, where the main plots were represented by the treatments of irrigation water and castor bean cultivation, and the subplots were the soil layers, with three replications. The treatments were T1 - wastewater irrigation + castor bean cultivation ; T2 - mixture of supply water and wastewater (1:1 ratio) + castor bean cultivation; T3 - supply...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reuse; Nutrients; Effluent; Water management; Ricinus communis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000500003

WILD PINEAPPLE (ANANAS BRACTEATUS (LINDL.), VAR. ALBUS) HARVESTED IN FOREST PATCHES IN RURAL AREA OF VIÇOSA, MINAS GERIAS, BRAZIL: EXCELLENT SOURCE OF MINERALS AND GOOD SOURCE OF PROTEINS AND VITAMIN C
Provedor de dados: 94
Autores: PAULA FILHO,GALDINO XAVIER DE; BARREIRA,TIBÉRIO FONTENELLE; FREITAS,GILBERTO BERNARDO DE; MARTINO,HÉRCIA STAMPINI DUARTE; SANT’ANA,HELENA MARIA PINHEIRO.
ABSTRACT  In the rural region of the municipality of Viçosa, Minas Gerais, forest patches are encountered and they present a great diversity of wild and edible fruit, where wild pineapple (Ananas bracteatus (Lindl.), var. albus) is one of those of greatest occurrence. Given that, little is known about the nutritional characteristics of this fruit, the present study aimed to investigate the physical and physic-chemical characteristics, chemical composition (titratable acidity, total soluble solids, pH, moisture content, ash, protein, lipids and dietary fiber), carotenoids (a-carotene, ß-carotene, ß-cryptoxanthin and lycopene), vitamin C (AA and DHA) by HPLC-DAD, vitamin E (a-, ß-, ?-, d-, tocopherols and tocotrienols) by HPLC-fluorescence, and minerals (P,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wild fruit; Nutritional value; Vitamins; Nutrients.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000300703

Enzyme complex at different levels in diets with enriched ingredients for commercial laying hens
Provedor de dados: 96
Autores: Silva,Jaqueline de Cássia Ramos da; Rabello,Carlos Bôa-Viagem; Ludke,Maria do Carmo Mohaupt Marques; Lopes,Cláudia da Costa; Arruda,Emmanuele Maria Florêncio de; Lopes,Elainy Cristina; Oliveira,Camilla Roana Costa de; Oliveira,Cláudio José Parro de.
ABSTRACT The objective of this study was to evaluate levels of inclusion of an enzyme complex (EC) in corn- and soybean meal-based diets for laying hens on the digestibility of nutrients and energy. A metabolism trial was conducted using 75 Dekalb Brown laying hens at 26 weeks of age, which were distributed into five treatments with five replicates in a completely randomized design. The ingredients used in the diets received an additional (enriched) 3% methionine, lysine, cysteine, threonine, tryptophan, and metabolizable energy and 33.3% phosphorus. Treatments consisted of diets including 0, 150, 200, 250, or 300 mg.kg‒1 EC. We determined apparent metabolizable energy (AME); nitrogen-corrected AME (AMEn); apparent metabolizability coefficients of dry...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Digestibility; Enzymes; Hens; Nutrients.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100503

Nutritional value of high and low tannin high-moisture sorghum grain silage in horses
Provedor de dados: 96
Autores: Gollcher,Augusta Martins Romaniello; Lima,José Augusto de Freitas; Fialho,Elias Tadeu; Rodrigues,Paulo Borges; Lima,Renato Ribeiro de.
The objective in this work was to determine the nutritive value of high and low tannin high-moisture sorghum grain silage in horse feeding by means of digestibility. A total of eight crossbred geldings at the age of six years and an average body weight of 330 kg were used in a complete randomized design with samples replicated on the same animals. The test-diets consisted of the ensiled high and low tannin sorghum grains replacing 30% of the dry matter of the reference diet, constituted exclusively by hay. The daily dry matter intake was equivalent to 2.0% of the body weight, so, the test diets were constituted by 30% of ensiled sorghum grains and 70% of hay. The digestibility coefficients of the nutrients of the low and high tannin sorghum grain silages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Horse; Nutrients; Nutrition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000600012

Variability in per capita oogonia and sporophyte production from giant kelp gametophytes (Macrocystis pyrifera, Phaeophyceae)
Provedor de dados: 97
Autores: MUÑOZ,VERÓNICA; HERNÁNDEZ-GONZÁLEZ,MARÍA C.; BUSCHMANN,ALEJANDRO H.; GRAHAM,MICHAEL H.; VÁSQUEZ,JULIO A.
Vegetative growth and fertility of kelp gametophytes are thought to be antagonistic, such that most successful kelp recruitment is assumed to result from fertilization of single oogonia released from unicellular female gametophytes. We used laboratory culture experiments to study the effect of temperature and nutrient addition on the per capita production of oogonia and sporophytes from Macrocystis pyrifera female gametophytes. Our results indicate that individual multicellular female gametophytes can give rise to more than one oogonium and that per capita oogonia production significantly increases with the enhancement of culture conditions (i.e., decreased temperature and increased nutrient concentration). Furthermore, the production of multiple oogonia...
Tipo: Journal article
Palavras-chave: Gametophytes; Macrocystis pyrifera; Nutrients; Oogonia production; Sporophyte production; Temperature.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400007

Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
Provedor de dados: 97
Autores: WOELFL,STEFAN; VILLALOBOS,LORENA; PARRA,ÓSCAR.
Lake Riñihue is the last in a chain of glacially derived oligotrophic lakes in southern Chile and was the subject of limnological research by Dr. Hugo Campos and co-workers at the Universidad Austral de Chile, Valdivia, Chile, since the 1970's. Prof. Campos died in the field in 1998, and this paper now presents a review of these data with comments on methodology relevant to trophic parameters of this lake. Data are presented on inorganic nutrients, chlorophyll a, phytoplankton biomass, primary production and Secchi depth obtained over a period of 21 years between 1978 and 1997 in order to evaluate potential changes in these parameters over time. Non-parametric Wilcoxon rank sum tests were applied to determine temporal trends and revealed: (1) total...
Tipo: Journal article
Palavras-chave: Eutrophication; North Patagonian lake; Nutrients; Trophy; Analytical methods.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300010

Use of Spirulina platensis in treatment of fish farming wastewater
Provedor de dados: 124
Autores: Nogueira,Sara Monaliza Sousa; Souza Junior,José; Maia,Hudson Damasceno; Saboya,Jefferson Pablo Sousa; Farias,Wladimir Ronald Lobo.
ABSTRACT Each year, the amount of fish produced around the world increases, which contributes to several environmental impacts such as the disposal of effluents without treatment in the environment. This scientific work had as main objective the development of Spirulina platensis in fish effluents, a low cost medium for the production of biomass, in order to reduce the levels of some inorganic nutrients to reach the allowed parameters by the Brazilian environmental standards for effluent disposal and to enable reuse of the water. Nile tilapia (Oreochromis niloticus) fingerlings were produced in fresh water. The effluent generated by the culture was transferred to a pool where seawater was added until the salinity of 10 ‰ was reached. A strain of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Microalgae; Cyanobacteria; Bioremediation; Nutrients.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000400599

Germination of fungal pathogen spores in calcium, copper, manganese and zinc chelated with aminoacids
Provedor de dados: 124
Autores: Lorenzetti,Eloisa; Tartaro,Juliano; Alves Neto,Alfredo José; Stangarlin,José Renato; Portz,Roberto Luis; Kuhn,Odair José.
ABSTRACT Due to the environmental impact generated using fungicides, new alternatives for disease control have been arising, such as the use of nutrients that may act on the development of certain pathogens or decrease the host susceptibility to diseases. The objective of this work was to verify if chelates of calcium, copper, manganese and zinc inhibit the germination of Puccinia sorghi, Cercospora sp. and Exserohilum turcicum spores. Two experiments were carried out: the first with agar-water culture medium, where the treatments and spores were placed at the same moment and the second using corn leaves as substrate, where treatments were administered zero, one, two, three, four and five hours after the spores are sprayed. Calcium, copper, manganese and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative control; Nutrients; Chelates; Zea mays L.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400405

Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Provedor de dados: 63
Autores: Henry-Silva,Gustavo Gonzaga; Camargo,Antonio Fernando Monteiro.
The effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. In this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (Eichhornia crassipes, Pistia stratiotes and Salvinia molesta) to treat effluents from Nile tilapia culture ponds. The effluent originated from a 1,000-m² pond stocked with 2,000 male Nile tilapia Oreochromis niloticus. The treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). Water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eichhornia crassipes; Pistia stratiotes; Salvinia molesta; Aquaculture; Nutrients.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500003

The nutritional value of leaves of selected berry species
Provedor de dados: 63
Autores: Biel,Wioletta; Jaroszewska,Anna.
ABSTRACT: Although the medicinal properties of berry fruit are well known, there is relatively little information available concerning the applications of other parts of berry plants. Thus, in this study we determined the nutritional value of the leaves of selected berry species and their possible application in health promoting diets. The levels of nutrients, and macro- and microelements in the leaves of four species collected from allotment gardens in the city of Szczecin, Poland (53°26′17″ N, 14°32′32″ E; altitude 7 m a.s.l.) were identified: raspberry (Rubus idaeus L.), blackberry (Rubus fruticosus L.), chokeberry (Aronia melanocarpa L.), and sea buckthorn (Hippophae rhamnoides L.). Sea buckthorn leaves were the richest source of protein, raspberry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Berry plant leaves; Macroelements; Microelements.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500405

Decline of phosphorus, copper, and zinc in anaerobic swine lagoon columns receiving pretreated influent
Provedor de dados: 63
Autores: Szögi,Ariel A.; Vanotti,Matias B.
ABSTRACT Land application of both anaerobic lagoon liquid and sludge can increase nutrient accumulation beyond the soil’s assimilative capacity and become a threat to water quality in regions with intensive, confined swine production. In a 15-month meso-scale column study, we evaluated the effect of manure pretreatment on the reduction of total suspended solids (TSS), total phosphorus (TP), soluble reactive P (SRP), and total copper (Cu) and zinc (Zn) in swine lagoons using (i) enhanced solid-liquid separation (SS) and (ii) solid-liquid separation plus biological nitrogen treatment with nitrification-denitrification (SS + NDN). A conventional anaerobic lagoon treatment was included as a control. A mass flow balance revealed that with both pretreatments the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pig; Manure; Nutrients; Solid-liquid separation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500417

Can land use changes alter carbon, nitrogen and major ion transport in subtropical brazilian streams?
Provedor de dados: 63
Autores: Silva,Daniela Mariano Lopes da; Ometto,Jean Pierre Henry Balbaud; Lobo,Gré de Araújo; Lima,Walter de Paula; Scaranello,Marcos Augusto; Mazzi,Edmar; Rocha,Humberto Ribeiro da.
Several studies in tropical watersheds have evaluated the impact of urbanization and agricultural practices on water quality. In Brazil, savannas (known regionally as Cerrados) represent 23% of the country's surface, representing an important share to the national primary growth product, especially due to intense agriculture. The purpose of this study is to present a comprehensive evaluation, on a yearly basis, of carbon, nitrogen and major ion fluxes in streams crossing areas under different land use (natural vegetation, sugar cane and eucalyptus) in a savanna region of SE Brazil. Eucalyptus and sugar cane alter the transport of the investigated elements in small watersheds. The highest concentration of all parameters (abiotic parameters, ions, dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Savanna; Nutrients; Watershed; Sugar cane; Eucalyptus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400002

Environmental quality improvement of agricultural lands through silvopasture in southeastern United States
Provedor de dados: 63
Autores: Nair,Vimala D.; Haile,Solomon G.; Michel,Gérard-Alain; Nair,P.K. Ramachandran.
We hypothesized that, because of the ability of trees to sequester carbon (C) in the deep soil profile and remove excess nutrients from soils, the silvopastoral agroforestry system could enhance the environmental quality of the agricultural lands. To test this hypothesis, two sets of experiments were conducted in two soil orders in Florida, Spodosols and Ultisols, with two major objectives: i) determining the soil C accumulation and tracing the plant sources of C in soil fractions, and ii) quantifying water soluble phosphorus (WSP) and estimating the Soil P Storage Capacity (SPSC). Total C in both soil orders was greater under silvopasture than in treeless pastures, particularly at lower depths. Stable-isotope signature analysis suggested that C3 plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon sequestration; Nutrients; Soil P storage capacity; Treeless pasture.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500009

Nutritional status and specific leaf area of mahogany and tonka bean under two light environments
Provedor de dados: 36
Autores: Gonçalves,José Francisco de C.; Vieira,Gil; Marenco,Ricardo A.; Ferraz,João Baptista S.; Santos Junior,Ulysses Moreira dos; Barros,Francisco Cleber F.
Studies on nutritional status and leaf traits were carried out in two tropical tree species Swietenia macrophylla King (mahogany) and Dipetryx odorata Aubl. Willd. (tonka bean) planted under contrasting light environments in Presidente Figueiredo-AM, Brazil. Leaves of S. macrophylla and D. odorata were collected in three year-old trees grown under full sunlight (about 2000 µmol m-2 s-1) and natural shade under a closed canopy of Balsa-wood plantation (Ochroma pyramidale Cav. Ex. Lam.Urb) about 260 µmol m-2 s-1. The parameters analysed were leaf area (LA), leaf dry mass (LDM), specific leaf area (SLA) and leaf nutrient contents. It was observed that, S. macrophylla leaves grown under full sunlight showed LA 35% lower than those grown under shade. In D....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical species; Leaf traits; Nutrients; Forest succession.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000100004

AMMONIA TOXICITY AFFECTS CATIONS UPTAKE AND GROWTH IN PAPAYA PLANTS INCLUSIVE WITH SILICON ADDITION
Provedor de dados: 37
Autores: SANTOS SILVA,Bruna; MELLO PRADO,Renato de; CALERO HURTADO,Alexander; APARECIDA DE ANDRADE,Renata; PEREIRA DA SILVA,Gilmara.
ABSTRACT High ammonia (NH4 +) concentration can exert stress on many plants, which causes nutritional disorders and reduction on plant growth. However, depending on the intensity of the stress, it may be attenuated by silicon. In this work, the response of impact of cations and silicon accumulations and plant growth in cultivated papaya plants was investigated under different toxic ammonia concentrations regardless of the presence of silicon (Si). The experiment was conducted at the Universidade Estadual Paulista (UNESP) with papaya seedlings, variety 'Grupo Formosa' (Calimosa híbrida 01), grown in a glass greenhouse, in 1.7 dm3 pots filled with pine and coconut fiber-based substrate. The experimental design was a randomized block design, in a 5 x 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Biomass; Phytotoxicity; Nitrogen; Nutrients.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000300345

Considerations regarding the dominance of Cylindrospermopsis raciborskii under low light availability in a low phosphorus lake
Provedor de dados: 39
Autores: Tonetta,Denise; Hennemann,Mariana Coutinho; Brentano,Débora Monteiro; Petrucio,Mauricio Mello.
ABSTRACTAlthough many studies have shown that the dispersion, increased abundance and dominance of cyanobacteria can be attributed to nutrient enrichment, we discuss features contributing to the dominance of Cylindrospermopsis raciborskii in a shallow, polymictic, subtropical coastal lake with low phosphorus and light limitation (Peri Lake). The presence and dominance of C. raciborskii in an environment with such characteristics emphasizes the idea that nutrients alone do not explain the high density of this cyanobacterium. Other features should be considered in explaining this species dominance, such as phosphorus storage and physiological flexibilitywhich seem to be key features to high densities in low phosphorus systems.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Cyanobacteria; Cyanotoxins; Freshwater; Nutrients; Peri Lake; Phytoplankton; Plasticity; Subtropical.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300448

Spore germination, early development and some notes on the effects of in vitro culture medium on Frullania ericoides (Nees) Mont. (Frullaniaceae, Marchantiophyta)
Provedor de dados: 39
Autores: Silva-e-Costa,Juliana da Costa; Luizi-Ponzo,Andrea Pereira; Resende,Cristiano Ferrara de; Peixoto,Paulo Henrique Pereira.
ABSTRACT In bryophytes, establishment can occur by a sexual or asexual process, but the production of spores enables colonization of a wider range of habitats and substrates than can asexual propagules. Successful germination is critical for establishment in a new environment. This paper addresses germination and sporeling development in Frullania ericoides, a leafy liverwort species. Fresh spores were inoculated in vitro in different culture strengths of Knop’s nutrient solution (one-fourth strength, half strength, full strength, one and a half strength and double strength), in order to evaluate the effects of this solution on spore germination and on the development of external protonema. On the first assessment, spore germination was observed at all the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endosporic development; Knop’s medium; Liverworts; Nutrients; Protonema; Sporeling.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100019

Temporal variation of the phytoplankton community at short sampling intervals in the Mundaú reservoir, Northeastern Brazil
Provedor de dados: 39
Autores: Dantas,Ênio Wocyli; Moura,Ariadne do Nascimento; Bittencourt-Oliveira,Maria do Carmo; Arruda Neto,João Dias de Toledo; Cavalcanti,Airlton de Deus C.
The aim of this study was to determine how abiotic factors drive the phytoplankton community in a water supply reservoir within short sampling intervals. Samples were collected at the subsurface (0.1 m) and bottom of limnetic (8 m) and littoral (2 m) zones in both the dry and rainy seasons. The following abiotic variables were analyzed: water temperature, dissolved oxygen, electrical conductivity, total dissolved solids, turbidity, pH, total nitrogen, nitrite, nitrate, total phosphorus, total dissolved phosphorus and orthophosphate. Phytoplankton biomass was determined from biovolume values. The role abiotic variables play in the dynamics of phytoplankton species was determined by means of Canonical Correspondence Analysis. Algae biomass ranged from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cylindrospermopsis raciborskii; Eutrophication; Nutrients; Water supply reservoir.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000400008

Potencial fisiológico de sementes de mamona tratadas com micronutrientes - doi: 10.4025/actasciagron.v32i4.4829
Provedor de dados: 1
Autores: Oliveira, Rosa Honorato de; Universidade FederalRural dePernambuco, Unidade Acadêmica de Serra Talhada; Souza, Myrne Jamilly de Lima; UESB; Morais, Otoniel Magalhães; UESB; Guimarães, Bruno Vinicius Castro; UESB; Pereira Júnior, Hercílio de Assis; UESB.
O objetivo deste trabalho foi verificar os efeitos da aplicação de micronutrientes sobre a germinação e o vigor de sementes de mamona, especificamente a cultivar BRS 149 Nordestina. Utilizou-se o delineamento experimental inteiramente casualizado, com quatro repetições de 25 sementes. Os tratamentos constaram da testemunha, imersão em H2O, imersão em B, imersão em Zn, imersão em Cu, imersão em Mn, imersão em Mo e imersão em Fe. Por meio dos resultados obtidos, evidencia-se incremento na germinação e no vigor com a aplicação de micronutrientes às sementes de mamona. O B influenciou negativamente a germinação e o vigor e aumentou a porcentagem de sementes duras e dormentes.
Palavras-chave: 5.01.00.00-9 e 5.01.03.00-8 Ricinnus communis L.; Germinação; Sementes; Vigor; Plântulas; Nutrientes Fertilidade do Solo e Adubação Ricinus communis L.; Germination; Seeds; Vigor; Seedlings; Nutrients.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4829

Potential and restrictions of Poincianella pyramidalis (Tul.) L. P. Queiroz as native forage in the Brazilian semi-arid region
Provedor de dados: 2
Autores: França, Andrezza Araújo de; Silva, Divan Soares da; Fechine, Josean Tavares; Sousa, Francinilda Alves de; Andrade, Alberício Pereira de; Lichston, Juliana Espada.
Poincianella pyramidalis (catingueira) is a endemic plant of the Caatinga, selected by animals grazing on native pasture. With the aim of evaluating characteristics indicative of its nutritional quality, 10 plants were selected and identified, sampled at five different ages, were used to determine dry matter (DM), crude protein (CP), neutral detergent fibre (NDF), mineral matter (MM), DM degradability (Deg DM), NDF degradability (Deg NDF) and in situ and in vitro leaf-tissue degradability. Phytochemical prospection was performed, and 1H and 13C nuclear magnetic resonance applied to detect the presence of secondary compounds. The data were submitted to analysis of variance and Tukey’s test at 5%, and correlation analysis was carried out on the variables for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradability; Native forage; Nutrients; Plant defence; Tannins.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/47460

Dynamics of nitrogen concentration on intercropped ryegrass - 10.4025/actascianimsci.v34i1.12661
Provedor de dados: 2
Autores: Skonieski, Fernando Reimann; Universidade Federal de Santa Maria (UFSM); Viégas, Julio; Universidade Federal de Santa Maria (UFSM); Cruz, Pablo; Institut National de la Recherche Agronomique (INRA); Nornberg, José Laerte; Universidade Federal de Santa Maria (UFSM); Bermudes, Rogério Fôlha; Universidade Federal de Santa Maria (UFSM); Gabbi, Alexandre Mossate; Universidade Federal do Rio Grande do Sul (UFRGS).
The dynamics of nitrogen (N) in ryegrass intercropped with different forage species with regard to dry matter (DM) accumulation within an agroecological transition system was evaluated. Annual ryegrass was intercropped with black oats (RY + BO), white clover (RY + WC) and forage peanut (RY + FP). The experimental design was completely randomized, with three replications. The study applied the N dilution model for plant tissue which comparatively uses modifiable factors of the environment at optimal levels. The model shows decline in N concentration due to the DM accumulation of temperate grass pastures. Data were compared to model by the root mean square deviation analysis. Dilution coefficient (β), used in all pasture samples, was lower than -0.60....
Palavras-chave: Dilution coefficient; Forage peanut; Legumes; Nutrients; Oat; White clover.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/12661

Limnology of a lateral lagoon system connected to a Neotropical reservoir (Rosana reservoir, São Paulo/Paraná, Brazil)
Provedor de dados: 3
Autores: Ferrareze, Mateus; Instituto de Biociências; Nogueira, Marcos Gomes; Instituto de Biociências; Sartori, Luciana; Instituto de Biociências.
The aim of this work was to perform a comparative analysis of four lateral lagoons and of the main channel of the Rosana Reservoir (Paranapanema river), southeast Brazil. The fieldwork was conducted during dry and rainy periods of 2004 and 2005. The analyzed variables were chlorophyll a, turbidity, total phosphorus, total nitrogen, dissolved nutrients (ammonium, nitrate, nitrite, phosphate and silicate), Secchi disk transparency, suspended solids, temperature, pH, dissolved oxygen and electrical conductivity. Intense summer rainfall provided a high input of allochthonous material into the system, resulting in conspicuous changes - high turbidity and nutrient concentrations and low transparency, especially in the reservoir channel. The cluster analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecologia  Limnologia floodplain; Nutrients; Paranapanema river; Limnological variables; Spatial variability; Eutrophication Ecologia.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/21491

Effects of intensive fish-farming and domestic wastewater on the periphytic algal community in a tropical coastal lagoon (Juara, Brazil) - doi: 10.4025/actascibiolsci.v35i3.17094
Provedor de dados: 3
Autores: Almeida, Stéfano Zorzal de; Instituto de Botânica; Fernandes, Valéria de Oliveira; Universidade Federal do Espírito Santo.
This study aimed at evaluating the effects of the intensive fish-farming and the domestic wastewater on the structure of the phycoperiphyton community. Three experimental supports containing artificial substrate were assembled in two sampling sites: IF – region with intensive fish-farming and DW – near the domestic wastewater discharge. Samplings were carried out after the 21st, 26th and 31st day of colonization. The abiotic variables evaluated were: transparency, electrical conductivity, pH, turbidity, total suspended solids, alkalinity, dissolved oxygen, water temperature and nutrients. Phycoperiphyton was examined with regard to density, richness, abundance, dominance, diversity and eveness. Nutrients (total nitrogen, nitrate, ammonia nitrogen,...
Tipo: Estudos exploratórios
Palavras-chave: 2.05.00.00-9; Bacillariophyceae; Late successional stage; Nutrients; Phycoperiphyton; Artificial substrate 2.05.00.00-9.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/17094

Periphytic diatom as bioindicators in urban and rural streams  - doi: 10.4025/actascibiolsci.v36i1.18175
Provedor de dados: 3
Autores: Moresco, Carina; Universidade Estadual de Maringá; Rodrigues, Liliana; Universidade Estadual de Maringá.
Periphytic diatoms were sampled from two streams, one located in an urban area and the other located in a rural area, in Maringá, State of Paraná, Brazil. In addition to temporal variability, differences in the assemblage structure between streams were evaluated and correlated with physical and chemical characteristics. Six samples of periphytic diatoms were collected from each stream from July 2007 to June 2008. The streams differed in abiotic factors and in relation to the structure of diatom assemblages and the spatial scale was more important than the temporal scale (ANOVA, p ≥ 0.05; non-metric multidimensional scaling (NMS) stress = 13.73, p = 0.009). The Procrustes analysis (m2 = 0.7607 and p = 0.0001) showed that variables with the greatest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Biológicas - Ecologia indicator species; Nutrients; Human impact; Bacillariophyta; Periphyton Diatomáceas Perifíticas.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18175

Influence of a net cage tilapia culture on the water quality of the Nova Avanhandava reservoir, São Paulo State, Brazil - doi: 10.4025/actascibiolsci.v34i3.7298
Provedor de dados: 3
Autores: Mallasen, Margarete; Instituto de Pesca; Barros, Helenice Pereira de; Instituto de Pesca; Traficante, Daniela Polizeli; Estadual Paulista “Julio de Mesquita Filho”; Camargo, André Luiz Scarano; Escama Forte Aquacultura e Meio Ambiente Ltda.
In order to understand the influence of a net cage tilapia culture on the environment, water quality parameters were investigated during the period between December, 2005 and November, 2007. Three sampling stations were established in the reservoir of Nova Avanhandava (Zacarias, São Paulo State) as follows: upstream of net cage area (P1), in the rearing place (P2) and downstream of net cage area (P3). The mean values of the parameters examined in the water sampling stations were within the standards of water quality recommended by resolution no. 357/2005 of the Conselho Nacional do Meio Ambiente for class 2 freshwater bodies. A significantly higher mean concentration of total phosphorus (p &amp;lt; 0.05) in the P2 (0.035 mg L-1) was the result of the...
Tipo: Estudo da qualidade de água
Palavras-chave: 5.06.02.01-2 limnology; Phosphorus; Nutrients; Intensive fish farming; Tilapia Fatores abióticos de águas interiores.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7298

Characterization of Dairy Slurry in Sourthern Chile Farms
Provedor de dados: 113
Autores: Salazar,Francisco; Dumont,Juan Carlos; Chadwick,David; Saldaña,Rodolfo; Santana,Mabel.
In this study 50 slurry samples were collected from commercial dairy farms located in the South of Chile during 1995-1997. Samples were analyzed for dry matter, pH, organic matter, available and total macro nutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sodium), available and total micro nutrients (zinc, iron, manganese and copper) and total aluminum. Results showed that the dry matter content in dairy effluents was low, with 62% of the samples being &lt; 4% DM. This reflected the large volumes of water that the storage received. A great variation in nutrient content was observed in the analyzed samples, probably reflecting differences in feeding regimes, use of wash water, rainfall and age of slurry at the time of sampling. In general,...
Tipo: Journal article
Palavras-chave: Nutrients; Dairy effluents; Cattle slurry; Farm waste.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200005

Limnology of the largest multi-use artificial reservoir in NE Brazil: The Castanhão Reservoir, Ceará State
Provedor de dados: 42
Autores: LACERDA,LUIZ D.; SANTOS,JANAÍNA A.; MARINS,ROZANE V.; SILVA,FRANCISCO A.T.F. DA.
Abstract This work reviews the limnology of the largest multi-use reservoir in NE Brazil, the Castanhão Reservoir in Ceará State, during 5 years of an extended drought when the reservoir’s volume decreased from 88% to about 30%. Major physical and chemical parameters of the water column, phytoplankton community, trophic state and sediment geochemistry were monitored, as well as the impact from extensive aquaculture. Water quality of the full reservoir was maintained due to hydrodynamics, which transport nutrients to the hypolimnion of a stratified water column, rendering an oligotrophic state to the reservoir, notwithstanding the large nutrient inputs from aquaculture and irrigated agriculture. However, with the extension of the drought period, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochemistry; Hydrodynamics; Nutrients; Water quality; Sediments; Aquaculture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502073

Spatial changes in the water quality of Itajaí-Açú Fluvial-Estuarine System, Santa Catarina, Brazil
Provedor de dados: 42
Autores: Pereira-Filho,Jurandir; Rörig,Leonardo R.; Schettini,Carlos A.F.; Soppa,Mariana A.; Santana,Bruno L.; Santos,José Eduardo dos.
This study was carried out with the aim of evaluating the spatial variation of the water quality in the Itajaí-Açú River estuary. Seven stations along the estuary were monitored on a weekly basis, from October 2003 to December 2004, plus two stations in tributaries (Itajaí-Mirim River, the main tributary, and one reference station). This monitoring included measurements of salinity, pH, dissolved oxygen, temperature, nutrients(NH+4,NO3-2,NO-3,PO3-4,H4SiO4) Biochemical Oxygen Demand (BOD), total phosphorous and dissolved organic phosphorus (TP and DOP), particulate organic carbon (POC), suspended particulate matter (SPM) and chlorophyll-a (Cla). Multivariate analyses demonstrated the compartmentalization of the system based on the deterioration in water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itajaí Estuary; Nutrients; Organic matter; River; Santa Catarina.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400019

Timing and placement of cattle manure and/or gliricidia affects cotton and sunflower nutrient accumulation and biomass productivity
Provedor de dados: 42
Autores: PRIMO,DÁRIO C.; MENEZES,RÔMULO S.C.; OLIVEIRA,FABIO F. DE; DUBEUX JÚNIOR,JOSÉ CARLOS B.; SAMPAIO,EVERARDO V.S.B.
ABSTRACT Organic fertilizers are a viable alternative to increase oilseed productivity in family agriculture systems. The study aimed to evaluate the effects of timing and placement of cattle manure and/or gliricidia (Gliricidia sepium Jacq. Walp) prunings on cotton (Gossipium hirsutum L.) and sunflower (Helianthus annuus L.) nutrient accumulation and biomass productivity. Experiments were carried out in 2010 and 2011 in Taperoá, Paraíba, Brazil. The organic fertilization treatments were: GI - gliricidia incorporated before planting; GS - gliricidia applied on surface 45 days after planting (DAP); MI + GI - manure and gliricidia incorporated before planting; MI + GS - manure incorporated before planting and gliricídia applied on the surface 45 DAP; MI -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Gossypium hirsutum L.; Green manure; Nutrients; Productivity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100415

Phosphorus dynamics in a highly polluted urban drainage channel-shallow reservoir system in the Brazilian semiarid
Provedor de dados: 42
Autores: ARAÚJO,GERMÁRIO M.; LIMA NETO,IRAN E.; BECKER,HELENA.
Abstract: This paper investigates phosphorus dynamics in a highly polluted system composed of a drainage channel followed by a shallow reservoir in the city of Fortaleza, Brazilian semiarid. During the dry season, significant non-point source loads of total phosphorus originated from residences unconnected to sewers were identified along the channel, resulting in an increasing flow rate of untreated sewage towards the reservoir. During the rainy season, as a consequence of dilution, phosphorus concentrations decreased by about 5-fold. The results also revealed that the reservoir was acting similarly to a waste stabilization pond, with phosphorus removal efficiency of about 33%. Assuming one-dimensional flow for the channel and complete mixing for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffuse pollution; Eutrophication; Nutrients; Semiarid; Urbanization; Water quality modeling.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500902

The use of rocks to improve family agriculture in Brazil
Provedor de dados: 42
Autores: Theodoro,Suzi H.; Leonardos,Othon H.
During the second half of the 20th century, the introduction of new chemical agriculture technologies brought about a revolution in food production, but this has also cause deep deterioration in our relationships with the natural environment. In developing tropical countries, record yields were accompanied by rural exodus, widespread deforestation and loss of topsoil. The stonemeal research described herein is an alternative to such practices as it is an environmental friendly and socially responsible technology based on soil rejuvenation and conservation by means of the addition of natural rock powders that are rich in phosphorous, calcium, magnesium, potassium and micronutrients. The research adopted an inter-disciplinary approach and was conducted among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stonemeal; Nutrients; Small farmers.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400008

Compositional studies and biological activities of some mash bean (Vigna mungo (L.) Hepper) cultivars commonly consumed in Pakistan
Provedor de dados: 48
Autores: Zia-Ul-Haq,Muhammad; Ahmad,Shakeel; Bukhari,Shazia Anwer; Amarowicz,Ryszard; Ercisli,Sezai; Jaafar,Hawa ZE.
BACKGROUND: In recent years, the desire to adopt a healthy diet has drawn attention to legume seeds and food products derived from them. Mash bean is an important legume crop used in Pakistan however a systematic mapping of the chemical composition of mash bean seeds is lacking. Therefore seeds of four mash bean (Vigna mungo (L.) Hepper, family Leguminoseae) cultivars (NARC-Mash-1, NARC-Mash-2, NARC-Mash-3, NARC-Mash-97) commonly consumed in Pakistan have been analyzed for their chemical composition, antioxidant potential and biological activities like inhibition of formation of advanced glycation end products (AGE) activity and tyrosinase inhibition activity. RESULTS: The investigated cultivars varied in terms of biochemical composition to various...
Tipo: Journal article
Palavras-chave: Nutrients; Antioxidant potential; Mash bean cultivar; Pakistan.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100023

Effect of the inherent variation in the mineral concentration of alfalfa cultivars on aphid populations
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Primavesi,Ana Cândida.
Plants have inherent variability of mineral content which affects their physiology and consequently the herbivorous insects feeding on them. Besides, insects need considerable amounts of potassium, phosphorus and magnesium in their diets, whereas little calcium, sodium and chloride are required. In this study, the inherent variation on mineral (Ca, S, Mg, N, P, K and also C:N ratio) concentrations and aphid (Acyrthosiphon spp., Therioaphis maculata, Aphis craccivora) populations on three alfalfa (Medicago sativa) cultivars (P3; Crioula, the most widely cultivated in Brazil, and CUF 101, an aphid-resistant) were studied between September/1997 and August/1998. A significant variation on mineral concentrations and aphid populations was observed among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphididae; Insecta; Nutrients; Resistance; Plant-insect relation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052005000200010

Food quantity and quality of cassava affected by leguminous residues and inorganic nitrogen application in a soil of low natural fertility of the humid tropics
Provedor de dados: 53
Autores: Moura-Silva,Aline Gomes; Aguiar,Alana das Chagas Ferreira; Jorge,Neuza; Agostini-Costa,Tânia da Silveira; Moura,Emanoel Gomes.
ABSTRACT The aim of this study was to test the hypothesis that the quality and quantity of biofortified cassava root in a humid tropical environment can be modified with the application of a combination of low- and high-quality residues of leguminous tree species. The experiment was designed as a 6 × 2 factorial (a combination of 4 legume species versus 2 levels of nitrogen) with 4 replications in a randomized block design and the following treatments: Gliricidia + Acacia, Gliricidia + Leucaena, Gliricidia + Clitoria, Leucaena + Acacia, Leucaena + Clitoria, and a control without legumes. We analyzed the shoot weight, number of roots/plant, root weight, root production, proximate composition, as well as the mineral, carotenoid, and pro-vitamin A contents....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofortification; Food security; Green manure; Nutrients.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300406

Carbon Dioxide Biofixation and Production of Spirulina sp. LEB 18 Biomass with Different Concentrations of NaNO3 and NaCl
Provedor de dados: 52
Autores: Moraes,Luiza; Rosa,Gabriel Martins da; Souza,Michele da Rosa Andrade Zimmermann de; Costa,Jorge Alberto Vieira.
ABSTRACT Microalgae are efficient at using solar energy to turn CO2 and nutrients into biomass containing lipids, proteins, carbohydrates and other compounds that may be used to produce bioproducts for human and animal consumption and pharmaceutical use. The aim of this study was to assess the effect of the NaNO3 and NaCl concentration on the growth kinetics, the biomass composition and the ability to biofix CO2 using the microalga Spirulina sp. LEB 18. The assays were carried out according to a 22 central composite design (CCD) with different concentrations of NaNO3 (1.25, 1.88 and 2.50 g L-1) and NaCl (1.00, 15.0 and 30.0 g L-1). The assays were carried out in 2 L vertical tubular photobioreactors at 30°C, 12 h light/dark and an injection of 12.0% v/v of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2; Fixation; Growth kinetics; Microalgae; Nutrients.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100410

Changes in nutrient loads (N, P and Si) in the São Francisco estuary after the construction of dams
Provedor de dados: 52
Autores: Medeiros,Paulo Ricardo Petter; Knoppers,Bastiaan Adriaan; Cavalcante,Geórgenes Hilário; Souza,Weber Friederichs Landim de.
The aim of this study was to investigate the post-dam conditions of the loads and yields of dissolved inorganic nitrogen (DIN), orthophosphate (DIP, silicate (DSi) and total phosphorous (TP) in the Lower São Francisco river estuary (NE-Brazil) after the river was regulated to a constant flow by the dams. Loads and yields of monthly measurements performed from November 2000 to March 2002 at a gauging station downstream of the dams (80 km from the coast) showed 4.1 x 10³ t/yr and 0.006 t/km² /yr of DIN, 0.2 x 10³ t/yr and 0.002 t/km² /yr of DIP, and 448 x 10³ t/yr and 0.71 t/km² /yr of DSi, respectively. Over the last 15 years, DIN loads reduced by 94 % and DSi by 31%. The river turned into an oligotrophic system with primary production limited by nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Fluvial loads; Dam impacts; Estuary; São Francisco River (NE-Brazil).
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000200022

Methanogenesis in an impacted and two dystrophic coastal lagoons (Macaé, Brazil)
Provedor de dados: 52
Autores: Furtado,André Luiz dos Santos; Casper,Peter; Esteves,Francisco de Assis.
This study investigated the methanogenic activity in sediment of the Imboacica (human impacted), Cabiúnas and Comprida coastal lagoons in Rio de Janeiro State (Brazil). Methane was not detected in water and sediment samples from the three lagoons. The measured nutrient concentrations in the pore-water indicated that methanogens activity was not limited by nutrients. Methanogenic activity was not detected under in vitro conditions, indicating that terminal organic carbon mineralisation via methanogenesis was negligible for the top 6 cm of sediment at the sampling time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoon; Methane; Sediment; Nutrients.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200011

Seasonal variability of coastal water quality in bay of Bengal and Palk Strait, Tamilnadu, Southeast Coast of India
Provedor de dados: 52
Autores: Srinivasan,Viswanathan; Natesan,Usha; Parthasarathy,Anitha.
The aim of this work was to study the physicochemical parameters of water quality collected from 12 sampling stations from Topputhurai to Muthupet in Vedaranyam located on the southeast coast of India from January to December 2008. Results showed that the DO and nutrients were the maximum in the Bay of Bengal during the monsoon period. High concentration of the nutrients in summer season was obtained near the Muthupet mangroves compared to the Palk Strait, which showed that this acted as a source of nutrients to the adjacent coastal waters. Low concentrations of the nutrients observed in the monsoon could be attributed to the terrestrial runoff from Muthupet lagoon. The physicochemical characteristics of coastal waters between the Point Calimere and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal zone; Physico-chemistry of water; Nutrients; Vedaranyam; Bay of Bengal; Palk Strait.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500020

Suspended matter and nutrient gradients of a small-scale river plume in Sepetiba Bay, SE-Brazil
Provedor de dados: 52
Autores: Rodrigues,Raphael Paiva; Knoppers,Bastiaan Adriaan; Souza,Weber Friederichs Landim de; Santos,Elisamara Sabadini.
Coastal river plumes represent one of the final stages of material transport across the land-sea interface. Most studies, however have focused on the behavior of medium to large sized river plumes of coastal-shelf waters, whereas small sized river plumes acting within estuaries have been neglected. This study addressed the behavior of suspended particulate matter (SPM), dissolved inorganic nutrients (DIN, DIP and DSi) and Chlorophyll a (Chl. a) of a small sized river plume derived from the closely lain São Francisco and Guandú river channels, set in the Sepetiba Bay estuary, SE-Brazil. Two surface water sampling campaigns were conducted, one in January 2003 (humid summer conditions) and the other in June 2003 (dry winter conditions). On both occasions, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Suspended matter; Nutrients; Estuarine gradients; River plume; Sepetiba Bay; SE-Brazil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200030

Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil
Provedor de dados: 52
Autores: Marques Júnior,Aguinaldo Nepomuceno; Crapez,Mirian Araujo Carlos; Barboza,Conceição Denise Nunes.
The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Sewage outfall; Water pollution; Nutrients; Guanabara Bay.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500014

Seasonal fluctuation of some limnological variables on a floodplain lake (Patos lagoon) of the Upper Paraná River, Mato Grosso do Sul State, Brazil
Provedor de dados: 52
Autores: Rodrigues,Luzia Cleide; Train,Sueli; Roberto,Maria do Carmo; Pagioro,Thomaz Aurélio.
Temporal variations of some limnological variables in limnetic and littoral regions of Patos lagoon, a "várzea" lake on the floodplain of the Upper Paraná River (22(0) 43'12"S e 53(0) 17'37"W), were studied in relation to hydrological and climatological factors. Measurements of water temperature, euphotic zone, suspended material, electrical conductivity, total alkalinity, pH, dissolved oxygen, carbon dioxide, total nitrogen, total Kjeldahl nitrogen, total phosphorus, dissolved phosphorus, reactive soluble phosphorus and chlorophyll a were taken monthly between March 1993 and February 1994. Results lend evidence to the importance of the hydrological regime on the dynamic of limnological variables in floodplain lakes. A dilution of nutrients in the lagoon,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Limnological variables; Flood pulse; Floodplain; Paraná River; Connectivity; Nutrients.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600014

Effects of light and nutrients on different germination phases of the Cosmopolitan moss Bryum argenteum Hedw. (Bryaceae)
Provedor de dados: 52
Autores: Silva,Adaíses Simone Maciel da; Pôrto,Kátia Cavalcanti; Simabukuro,Eliana Akie.
The influence of light and nutrients on the different germination phases of Bryum argenteum spores was studied. The following treatments were used: distilled water and nutrient solution under light (12 h) and continuous darkness. The spores germinated when exposed to light, independent of both medium used. Under darkness, the spores swelled and became chlorophyllous. In the presence of nutrient solution, the germination occurred earlier (after two days) when compared to the distilled water (after more than three days). Nutrients were needed to complete the last germination phase in the majority of spores and to provide the protonemal growth.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophyte; Physiology; Germination; Protonema; Light; Nutrients.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400003

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil
Provedor de dados: 52
Autores: Santos,Isaac Rodrigues; Costa,Ronaldo Cataldo; Freitas,Ubiratan; Fillmann,Gilberto.
The hypothesis that effluents treated through activated sludge process cause changes in nutrient biogeochemistry of receiving water bodies was investigated in Vieira creek, southern Brazil. Dissolved oxygen, suspended matter, and pH did not vary among the sampling stations. Nutrient, biochemical oxygen demand, and conductivity values were significantly higher downstream from the Wastewater Treatment Plant (WWTP) effluents. Further downstream, nitrate concentrations were higher due to ammonium nitrification, organic matter remineralization and/or the occurrence of unidentified sources. Per capita nutrient emission factors were estimated to be 0.16 kg P.yr-1 and 4.14 kg N.yr-1. Under pristine conditions, low N:P ratios were observed, which were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activated sludge; Nutrients; Contamination; Coastal zone; Biogeochemistry; Eutrophication.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100019

Eugenia Klotzschiana O. Berg Fruits as New Sources of Nutrients: Determination of their Bioactive Compounds, Antioxidant Activity and Chemical Composition
Provedor de dados: 52
Autores: Carneiro,Nárgella Silva; Alves,Cássia Cristina Fernandes; Cagnin,Caroline; Belisario,Celso Martins; Silva,Marco Antônio Pereira da; Miranda,Mayker Lazaro Dantas; Oliveira Filho,Josemar Gonçalves de; Alves,José Milton; Pereira,Paulo Sérgio; Silva,Fabiano Guimarães; Egea,Mariana Buranelo.
Abstract: The Cerrado is one of the world's biodiversity hotspots and Brazil’s second largest biome. Many native species of the Brazilian Cerrado provide fruits that have unique sensory characteristics and high nutritional value. This study aimed at characterizing the pulp of Eugenia klotzschiana O. Berg, concerning its proximal composition, bioactive compound content and antioxidant activity. The pulp under study had high moisture (89.47 g kg-1) and caloric (96.07 kcal kg-1) values whereas its contents of protein (0.59 g kg-1) and lipids (2.35 g kg-1) were low. The cerrado pear pulp also had high iron content (16.5 mg kg -1) and dietary fiber (6.45 g kg-1), besides 0.034-0,055 mg kg-1 carotenoids, 8.66 mg kg-1 ascorbic acid and 0.66 mg kg-1 total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado pear; Nutrients; Flavonoids; Antioxidant capacity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100402

Hydrology and phytoplankton community structure at Itamaracá-Pernambuco (Northeast Brazil)
Provedor de dados: 52
Autores: Koening,Maria Luise; Macêdo,Silvio José de.
Quali-quantitative studies and hydrologic parameters were carried out in the profiles 6 (Orange) and 7 (Catuama) during the Victor Hensen cruise, in accordance with the bilateral scientific cooperation agreement Brazil/Germany. Hydrologically a zone of thermic and saline stability characterizes the superficial layer. The nutrient concentrations were generally low on the surface and higher at levels surpassing 100m in depth. 102 taxa were identified including diatoms (49), dinoflagellates (49), bluegreen algae (3), and euglenophyceae (1). The diversity and evenness were high, surpassing the environmental equilibrium. The clustering of samples showed evidence of 2 main groups, one encompassing the stations 32 and 38, characterized predominantly by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrology; Nutrients; Phytoplankton structure.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400002

IV.Heat stress in Triticum: kinetics of Fe and Mn accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Lidon,Fernando C.; Ramalho,José C.
The interactions between Fe/Mn accumulation and the photosynthetic light reactions were investigated in heat stressed bread and durum wheat genotypes (Triticum aestivum L. and Triticum turgidum subsp.durum). Four genotypes were chosen according to its genetic background diversity. Plants were grown in a greenhouse at two different day/night temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), during the grain filling phase. The contents and uptake/translocation of Fe and Mn were evaluated on booting, grain filling and maturity and correlated with chlorophyll a fluorescence parameters. It was found that, under heat stress, the concentrations of Fe in the culm and leaves diminished in bread wheat, but increased in durum wheat. An opposite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Nutrients; Translocation; Triticum aestivum L.; Triticum turgidum subsp. durum; Uptake.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200008

Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado
Provedor de dados: 61
Autores: Scholz,Fabian G.; Bucci,Sandra J.; Goldstein,Guillermo; Meinzer,Frederick C.; Franco,Augusto C.; Salazar,Ana.
The objective of this study was to characterize and understand morphological and physiological variation in traits related to water economy, at the plant and stand level, along a gradient of tree density in a Neotropical savanna (Cerrado). Cerrado plots subjected to long-term fertilization and gallery forests were also included in the analysis to expand the axes of ecosystem variation. Consistent changes in stand level biophysical traits observed along the gradient of increasing tree density included a decrease in weighted-average wood density, and increases in leaf surface area per plant, leaf specific hydraulic conductivity, specific leaf area and stomatal conductance. A conceptual model of biophysical, morphological and physiological trait interactions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallery forest; Hydraulic architecture; Nutrients; Savannas; Specific leaf area; Wood density.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300006

Evaluation of On-Farm Quick Tests on Slurries from Southern Chile Dairy Farms
Provedor de dados: 117
Autores: Salazar S,Francisco; Rosas U,Marianela.
Currently in Chile, there is a lack of tools to determine the real-time nutrient contribution of slurries. This study aims to evaluate three quick tests for their accuracy in estimating the total contents of N (TN), P (TP), K (TK), and ammonium-N (N-NH4+) in dairy slurries. The quick tests included the Agros Nova Meter, Quantofix N Volumeter, and a hydrometer. While the Agros and Quantofix meters directly measure the ammonium-N content; the hydrometer indirectly estimates the total content of N, P, and K based on linear relationships with the slurry DM. Samples (73) were collected from dairy farms along Southern Chile (39° to 44° S and 71 to 73° W). Analyses were carried out on laboratory conditions using conventional techniques as well as using each of...
Tipo: Journal article
Palavras-chave: Slurry; Organic residue; Chemical analysis; Nutrients.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300021

Zinc Fertilization Effects on Seed Cadmium Accumulation in Oilseed and Grain Crops Grown on North Dakota Soils
Provedor de dados: 117
Autores: Rojas-Cifuentes,Gonzalo A; Johnson,Burton L; Berti,Marisol T; Norvell,Wendell A.
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Tipo: Journal article
Palavras-chave: Soil series; Seed; Uptake; Nutrients; Contamination.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100019

Leaf water potential, nutritional status and must composition in grapes 'Pinot Nero' with and without irrigation
Provedor de dados: 65
Autores: Ciotta,Marlise Nara; Ceretta,Carlos Alberto; Tagliavini,Massimo; Zanotelli,Damiano; Moser,Damiano; Nava,Gilberto; Porro,Duilio; Brunetto,Gustavo.
Irrigating vineyard soils can affect grapevine water potential, nutritional status, and must composition. This study aimed to evaluate leaf water potential, nutritional status, and must composition in cv. 'Pinot Nero' grapevines grown with and without irrigation. The experiment was conducted at a commercial vineyard of 'Pinot Nero' 828 grafted on SO4rootstock, established in 2002 in Trento, Northern Italy. The treatments were irrigated (I) and non-irrigated (NI) throughout the 2013 crop season. The criteria evaluated were the water potential of the leaves, total nutrient content in the leaves and berries, and weight of 100 berries, as well as the total soluble solids content, pH, and total titratable acidity of the must. Despite providing a less negative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Irrigation; Vitis vinifera.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000801408

Macro and trace elements in edible mushrooms, Shiitake, Shimeji and Cardoncello from Petrópolis, Rio de Janeiro, Brazil
Provedor de dados: 65
Autores: Gonçalves,Jaylei Monteiro; Souza,Monique Dias Corrêa de; Rocha,Rafael Christian Chavez; Medeiros,Renata Jurema; Jacob,Silvana do Couto.
The concentrations of twenty-five elements (Al, As, Ba, Bi, Ca, Cd, Cr, Cu, Fe, Ga, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Rb , Sb, Se, Sn, Sr, V and Zn) were determined in three edible mushrooms, Shiitake (Lentinula edodes), Black Shimeji (Pleurotus ostreatusi) and Cardoncello (Pleurotus eryngyii) from Petrópolis, Rio de Janeiro, Brazil. Samples were collected along the year 2010 and their preparations were made after drying, milling, an acid pre-digestion and a decomposition procedure in a muffle furnace. The analytical techniques employed for the elements determination were Mass Spectrometry with Inductively Coupled Plasma and Flame Atomic Absorption Spectrometry. Two certified reference materials, Apple Leaves and Mussel Tissue, were used for the evaluation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Edible mushroom; Nutrients; Contaminants.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000500029

Winter cover crops affecting physical and chemical soil attributes in a commercial vineyard
Provedor de dados: 65
Autores: Veiga,Milton da; Feldberg,Nelson Pires; Nava,Gilberto; Bettoni,Jean Carlos.
ABSTRACT: Cover crops may have direct or indirect effects on the physical and chemicalsoil attributes; these cropsplay a key role in the cycling of nutrients in the soil and add labile organic carbon, bringing economic and environmental benefits to the system. To study the effect of cover crops on the physical and chemical properties of an Oxisol, a three-year experiment was conducted in a commercial vineyard located at Epagri’s Experimental Station in Videira, SC, Brazil. Different winter species (white clover, red clover, common vetch, turnip, corn spurrey, black oat, rye, and ryegrass) were sown in addition to treatments with manual weeding or mechanical mowing. Certain chemical and physical attributes of soil were determined in samples collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Nutrients; Bulk density; Soil porosity; Vitis spp.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001200252

Grumixama (Eugenia brasiliensis Lam.) cultivated in the Cerrado has high content of bioactive compounds and great antioxidant potential
Provedor de dados: 65
Autores: Xu,KaWai; Alves-Santos,Aline Medeiros; Dias,Tiago; Naves,Maria Margareth Veloso.
ABSTRACT: Grumixama (Eugenia brasiliensis Lam.) is a Brazilian berry native to the Atlantic Rainforest. Information on nutritional and bioactive profiles of the fruit cultivated in the Brazilian Savannah (Cerrado) is not available in literature. The aim of this study was to investigate the physical and proximate composition; mineral, total phenolics, total tannins and total carotenoids contents; and antioxidant capacity (DPPH and FRAP assays) of the dark purple grumixama cultivated in the Cerrado area (Goiás State). Results showed a similar physical and proximate composition to those of grumixama native to the Atlantic Rainforest. However, grumixama from Cerrado presented the highest dietary fiber and magnesium contents. In addition, the Cerrado grumixama...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eugenia brasiliensis Lam.; Nutrients; Bioactive compounds; Polyphenols; Antioxidant activity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000400752

Nutritional and energetic value of rice by-products, with or without phytase, for growing pigs
Provedor de dados: 65
Autores: Dadalt,Julio Cezar; Ribeiro,Andréa Machado Leal; Kessler,Alexandre de Mello; Wesendonck,William Rui; Bockor,Luciane; Gomes,Gilson Alexandre.
The objective of this study was to evaluate nutritional and energetic value of rice by-products, with or without phytase, using growing pigs. Thirty-six male pigs were housed in individual metabolic cages. Total collection of feces and urine was carried out in two periods of ten days: five days for adaptation and five days for collection. A randomized blocks design was used, considering the sampling period as a block, with five treatments and seven replicates. Two control diets (with and without phytase - Phy) were used in the digestibility calculations, the latter in order to evaluate the enzyme influence on energy digestibility of the tested ingredients. The control diet was replaced by 30% of one of the ingredients: defatted rice bran (DRB) with and...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Alternative ingredients; Dephytinization; Enzyme; Nutrients.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000701305

Heavy metals availability and soil fertility after land application of sewage sludge on dystroferric Red Latosol
Provedor de dados: 64
Autores: Moreira,Rodrigo Santos; Mincato,Ronaldo Luiz; Santos,Breno Régis.
Sewage sludge is the solid residue obtained from urban sewage treatment plants. It is possible to use the sludge in a sustainable way as fertilizer and as soil conditioner due to its high levels of organic matter and nutrients. Besides pathogens and volatile organic compounds, the residue may also contain heavy metals which may accumulate and contaminate crops and the food chain. The aim of this study was evaluates the changes in the fertility of dystrophic Red Latosol and in the availability of heavy metals following application of sewage sludge. It was assessed whether organic matter supplied to the soil as large amounts of sewage sludge would decrease availability of heavy metals in the soil due to of insoluble compounds formation. From this, an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolids; Soil pollution; Nutrients; Lactuca sativa.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000600004

Micronutrients accumulation at different maize development stages
Provedor de dados: 64
Autores: Borges,Iran Dias; Von Pinho,Renzo Garcia; Pereira,José Luiz de Andrade Rezende.
The study of micronutrients accumulation as a function of plant development stage is of fundamental importance to subsidize strategies for fertilizer application and minimum amount to maintain soil fertility. This study evaluated micronutrient accumulation in two maize cultivars at different development stages. The experimental design was randomized blocks with four replications in split-plots, with two maize hybrids as the plots and sampling time according to development stages as sub-plots. Maize accumulated minimum amounts of B, Cu, Mn, and Zn in the initial stages of development, and the maximum accumulated values were observed after 100 days seedling emergency. The evaluated hybrids accumulated maximum of Zn and Cu close to physiological maturity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Accumulation; Nutrients; Cultivars.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000400011