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| Registros recuperados: 238 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 238 | |
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