Consulta: subjectFacets:"Nutrient cycling"
Registros recuperados: 56
Data/hora: 04/06/2024 16:49:24

Food Sources and Accessibility and Waste Disposal Patterns across an Urban Tropical Watershed: Implications for the Flow of Materials and Energy
Provedor de dados: 7
Autores: Garcia-Montiel, Diana C.; Institute For Tropical Ecosystem Studies; dgarcia@ites.upr.edu.
Tipo: Peer-Reviewed Reports
Palavras-chave: Household; Nutrient cycling; San Juan ULTRA; Social-ecological systems; Urban biogeochemistry; Urban ecology; Urban metabolism; Watershed.
Ano: 2014

NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Staelens,Jeroen; Godoy,Roberto; Oyarzún,Carlos; Thibo,Karen; Verheyen,Kris.
Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic...
Tipo: Journal article
Palavras-chave: Ammonium; Atmospheric deposition; Canopy interactions; Nitrate; Nutrient cycling; Amonio; Ciclos de nutrientes; Depositación atmosférica; Interacciones del dosel; Nitrato.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002

SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
Provedor de dados: 73
Autores: Lusk,Christopher H.; Matus,Francisco; Moreno-Chacón,María; Saldaña,Alfredo; Jiménez-Castillo,Mylthon.
Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at...
Tipo: Journal article
Palavras-chave: Nitrogen; Nutrient cycling; Phosphorus; Plant nutrition; Resorption.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006

Physico-chemical attributes of no-till Brassica crops cultivated after various cover crops
Provedor de dados: 75
Autores: Torres,José LR; Ciabotti,Elaine D; Gomes,Fernando RC; Leal Junior,André LB; Vieira,Dinamar MS; Costa,Luciene L.
ABSTRACT Cauliflower and cabbage require high amounts of nutrients in short periods of time; however, the intensive use of inorganic fertilizers can cause nutritional imbalances in these crops and reduce the quality of the final product. This study evaluated the chemical composition and yield of no-till cauliflower and cabbage grown on residues of various cover crops in Uberaba, Minas Gerais State, Brazil. The experimental design was randomized blocks with four cover crops (sunn hemp, brachiaria, pearl millet and fallow) and two main crops (cauliflower and cabbage). The treatments were evaluated on plots of 20 m2 with four replications. The following traits were analyzed after harvest: moisture (MO), ash (ASH), lipid (LIP), crude fiber (CF), protein (PTN),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. botrytis; Brassica oleracea var. capitata; Crop residues; Nutrient cycling; Plant quality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200252

Seagrass ecosystems
Provedor de dados: 13
Autores: Phillips, R. C.; Milchakova, N. A.
The seagrass ecosystem is defined as a unit of biological organization comprised of interacting biotic and abiotic components. The structural components are shelter and food and feeding pathways and biodiversity. Functional components include the rate of nutrient cycling, the rate of energy flow, and biological regulation. Healthy intact seagrass ecosystems provide services since they relate to the health, stability and well-being of the environment in which they live, but also to that of human populations.
Tipo: Journal Contribution
Palavras-chave: Seagrass; Ecosystem; Production; Nutrient cycling; Energy flow; Biological regulation; Ecosystem services; Морские травы; Экосистема; Поток энергии; Биологическая регуляция; Экосистемные услуги Ecosystems Energy flow Ecosystems Energy flow http://aims.fao.org/aos/agrovoc/c_2482 http://aims.fao.org/aos/agrovoc/c_2569.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/42

Produção de biomassa, composição química e atributos químicos do solo do consórcio milho-leguminosas forrageiras na comunidade Boqueirão, Sobral-CE.
Provedor de dados: 14
Autores: POMPEU, R. C. F. F.; SOUZA, H. A. de; FARIAS, J. L. de S.; BEZERRA, J. W. T.; FERNANDES, F. E. P.; PEREIRA, P. L.; ARAUJO, M. R. A. de; RIELLA, J.
Objetivou-se avaliar a produção de biomassa, composição química e os atributos químicos do solo do consórcio milho-leguminosas forrageiras numa comunidade do município de Sobral, CE. Foram avaliados os consórcios milho-cunhã e milho-crotalária num delineamento de blocos completos casualizados, com quatro repetições. As parcelas experimentais foram constituídas de seis fileiras, com 5 m de comprimento, espaçadas entre si de um metro entre milho. O plantio do milho foi realizado no dia 01 de março de 2019, enquanto que o plantio das leguminosas foi realizado no dia 14 de março de 2019. Foram observadas diferenças de teores de matéria seca entre os consórcios cunhã-milho e crotalária-milho. Observou-se que a produção do consórcio crotalária-milho foi superior...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Feed crops; Nutrient cycling; Semiárido; Brasil; Região Nordeste; Leguminosa Forrageira; Cunha; Cobertura Morta; Volumosos; Alimento Para Animal; Forage production; Forage crops; Mulching; Biomass production; Intercropping; Brazil; Semiarid soils.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1117068

Produção e composição química da serrapilheira em um gradiente topográfico em mata de galeria no bioma cerrado.
Provedor de dados: 14
Autores: PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C.
RESUMO: Em função do gradiente de umidade na topografia do terreno e de diferenças entre estações seca e chuvosa, o presente trabalho teve como objetivos quantificar a produção anual e a disponibilidade de nutrientes (N, P, K, Ca, Mg E S) na serapilheira e estimar a eficiência do uso de nutrientes em uma Mata de Galeria. O experimento foi estabelecido numa área de 100 x 100 m da Mata de Galeria do Córrego Pitoco, na Reserva Ecológica do IBGE, DF (15°56'41"S e 47°56'07"W). Como delineamento experimental, foram estabelecidas três linhas de amostragem paralelas ao córrego, distantes 45 m entre si, denominadas, respectivamente, comunidades úmida (na margem do córrego), intermediárias e seca (adjacentes a uma área de Cerrado Típico). A produção de serapilheira...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Biogeoquímica; Ciclagem de nutriente; Eficiência de nutriente; Savana; Productivity; Nutrient cycling; Litterfall; Nutrient efficiency.; Disponibilidade de Nutriente; Floresta Tropical; Produtividade.; Biogeochemistry; Tropical forests.; Savannas.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569203

Os grandes ciclos biogeoquímicos do planeta.
Provedor de dados: 14
Autores: ADUAN, R. E.; VILELA, M. de F.; REIS JUNIOR, F. B. dos.
ABSTRACT: The aim of this work was to present in a didactic way the biogeochemical cycles of the four most important elements and substances on global chemistry: water, carbon, nitrogen and phosphorous. The importance of these elements and substances becomes from the great magnitude of mass and energy utilized in their processes, and on their essentiality on biosphere formation and maintenance. This work intends to showthe interdependence between these great cycles and the biosphere, and the way that the human activity influences on the chemical dynamic of the globe, and the consequences of these shifts for the humanity itself.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Biogeoquímica; Ciclagem de nutriente; Biosfera; Ciclo global; Variação climática; Nutrient cycling; Biogeochemical cycling; Global climate change; Água; Carbono; Fósforo; Nitrogênio.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569371

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon
Provedor de dados: 5
Autores: Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand.
Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by...
Tipo: Text
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf

Nutrient cycling in the Indian sector of the Southern Ocean over the last 50,000 years
Provedor de dados: 5
Autores: Crosta, X; Shemesh, A; Etourneau, J; Yam, R; Billy, I; Pichon, Jj.
Most high-southern latitude records of carbon and nitrogen isotopic ratios and elemental ratios are from the Antarctic and Polar Front zones, thus hindering a comprehensive view of nutrient cycling in the Southern Ocean. We present, for the first time, two records from the Subantarctic Zone and the southern Subtropical Zone of the Indian Ocean. These records provide a latitudinal transect covering the main oceanographic systems of the Southern Ocean. Carbon and nitrogen content of the diatom-bound organic matter increases during the last glacial in the Antarctic and Subantarctic zones but does not show a clear climate-related signal in the Subtropical Zone. Comparison of these records with sea-surface temperatures reconstructed at the core locations and...
Tipo: Text
Palavras-chave: Diatoms; Nutrient cycling; Southern Ocean.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00230/34075/32543.pdf

Rôle des sédiments dans le cycle des nutriments et impacts sur l’eutrophisation des écosystèmes côtiers
Provedor de dados: 5
Autores: Ratmaya, Widya.
Eutrophication was studied in the coastal waters of Vilaine Bay (VB) in relation to that in the Loire and Vilaine rivers, by analyzing long-term trends of phytoplankton biomass and nutrient concentrations during the past decades. The reduction in dissolved riverine inorganic phosphorus concentrations (DIP) during the last two decades led to the significant decrease in chlorophyll a concentrations. However, dissolved inorganic nitrogen concentrations (DIN) decreased only slightly in the Vilaine and actually increased in the Loire, especially during summer. Simultaneously, phytoplankton in VB has undergone the following changes: 1) increase in biomass, 2) change in timing of the annual peak of biomass from spring to summer, 3) modification in seasonal course...
Tipo: Text
Palavras-chave: Eutrophisation; Cycle des nutriments; Régénération benthique; Nutriment limitant; Baie de Vilaine; Eutrophication; Nutrient cycling; Benthic regeneration; Nutrient limitation; Vilaine Bay.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00476/58799/61337.pdf

Atmospheric deposition of elements and its relevance for nutrient budgets of tropical forests
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Verryckt, Lore T.; Bréchet, Laëtitia; Courtois, Elodie A.; Stahl, Clement; Hofhansl, Florian; Bauters, Marijn; Sardans, Jordi; Boeckx, Pascal; Fransen, Erik; Peñuelas, Josep; Janssens, Ivan A.
Atmospheric deposition is an important component of the nutrient cycles of terrestrial ecosystems, but field measurements are especially scarce in tropical regions. In this study we analysed 15 months of precipitation chemistry collected in an old growth tropical forest located in French Guiana. We measured nutrient inputs via bulk precipitation and throughfall and used the canopy budget model to estimate nutrient fluxes via canopy exchange and dry deposition. Based on this method we quantified net fluxes of macronutrients and compared their contribution to internal cycling rates via litterfall. Our results suggest that while atmospheric deposition of nitrogen was relatively high (13 kg ha−1 year−1), and mainly in organic forms, the N inputs via litterfall...
Tipo: Text
Palavras-chave: Throughfall; Litterfall; Nutrient cycling; Nitrogen; Phosphorus; Potassium.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74123/73572.pdf

Nutrient flux associated with the emergence of Quesada gigas Olivier (Hemiptera: Cicadidae) in an urban ecosystem
Provedor de dados: 82
Autores: Aoki,C; Lopes,FS; de Oliveira,AMR; Souza,FL de; Marques,MR.
Large-bodied arthropods, such as cicadas, can be able to reallocate significant amounts of nutrients during adult emergence. Evidence suggests that Quesada gigas Olivier emergence constitutes an important nutrient flux from belowground to aboveground. The purpose of this study was to estimate the amount of nitrogen, proteins, and lipids resulting from the emergence of Q. gigas in an urban ecosystem in Central Brazil. Adult specimens captured from September to November 2006 were weighed and submitted to biochemical analysis. Population density was approximately 4,200 individuals per hectare. Mean individual dry mass was 1.03 g and contained 12.6% proteins, 8.4% lipids, and 5% nitrogen. Total biomass input from the species was 4.3 kg ha-1 y-1, with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual cicada; Biomass; Energy; Nutrient cycling; Chain feed.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000400004

Deposição de folhedo e retorno de nutrientes ao solo em quatro procedências de (Grevillea robusta Cunn.) no Sudoeste do Paraná
Provedor de dados: 190
Autores: Martins, Emerson Gonçalves; Ferreira, Carlos Alberto; Neves, Edinelson Jsosé Maciel; Inoue, Mario Takao.
Foram avaliadas a deposição de serapilheira e de nutrientes em quatro procedências de grevilea (Grevillea robusta Cunn), de quatro anos de idade, plantadas na Região de Quedas do Iguaçu, em solo classificado como LATOSSOLO VERMELHO Distroférrico (Haplustox). Os resultados possibilitaram as seguintes conclusões: 1) A grevilea produz em média 10267 kg de serapilheira por hectare/ano, superando as produções observadas em povoamentos de Pinus e Eucalyptus. 2) A concentração dos macronutrientes na serapilheira não tem relação com o crescimento volumétrico, exceto de P, que se apresenta em maior concentração em povoamentos com a menor produção volumétrica de média. 3) As procedências mais produtivas em madeira tenderam a depositar, pela serapilheira, as maiores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciclagem de nutrientes; Elementos minerais; Volume de madeira Litter; Nutrient cycling; Nutrient deposition; Wood volume.
Ano: 2004
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1597

Litter production of eucalypt plantations according to site quality
Provedor de dados: 190
Autores: Corrêa Neto, Thais de Andrade; Anjos, Lúcia Helena Cunha dos; Pereira, Marcos Gervasio; Jaccoud, Carlos Fellipe de Siqueira.
This study aimed to evaluate deposition and decomposition of litter and nutrient input in an area of eucalyptus plantation in top-sequence. It was verified significant contribution of the stratum leaves, what could be attributed to the age of the plantation. Regarding the rate of decomposition it was observed a decrease in the spring season at all sites. It was observed differences among sites related to top-sequence There was addition of nutrients as P, N and K, with a tendency for larger values of P in the top of the slope. The studied parameters reflect the different characteristics of the studied environmental growth conditions and their growth limitation and it suggest differences in the management of the areas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litter production; Nutrient cycling; Organic matter Ciclagem de nutrientes Produção de serapilheira; Ciclagem de nutrientes; Matéria orgânica.
Ano: 2014
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/484

Carbon and nitrogen cycling in an integrated soybean-beef cattle production system under different grazing intensities
Provedor de dados: 86
Autores: Assmann,Joice Mari; Anghinoni,Ibanor; Martins,Amanda Posselt; Costa,Sérgio Ely Valadão Gigante de Andrade; Kunrath,Taise Robinson; Bayer,Cimélio; Carvalho,Paulo Cesar de Faccio; Franzluebbers,Alan Joseph.
Abstract:The objective of this work was to evaluate the effect of grazing intensity on the decomposition of cover crop pasture, dung, and soybean residues, as well as the C and N release rates from these residues in a long-term integrated soybean-beef cattle system under no-tillage. The experiment was initiated in 2001, with soybean cultivated in summer and black oat + Italian ryegrass in winter. The treatments consisted of four sward heights (10, 20, 30, and 40 cm), plus an ungrazed area, as the control. In 2009-2011, residues from pasture, dung, and soybean stems and leaves were placed in nylon-mesh litter bags and allowed to decompose for up to 258 days. With increasing grazing intensity, residual dry matter of the pasture decreased and that of dung...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigose; Glycine max; Lolium multiflorum; Integrated crop-livestock; Nutrient cycling; Soil organic matter.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015001000967

Benthic macroinvertebrates and degradation of phytomass as indicators of ecosystem functions in flooded rice cropping
Provedor de dados: 86
Autores: Winckler,Lilian Terezinha; Güths,Angélica Konradt; Gayer,Pâmela Rodrigues.
Abstract: The objective of this work was to evaluate the ecosystem functions of a natural wetland and of artificially flooded rice areas, managed under organic and conventional systems, by phytomass degradation and by the colonization of this material by benthic macroinvertebrates. The experiment was carried out in a natural wetland area, and in two flooded rice areas managed under organic and conventional systems. Twenty-five decomposition bags filled with 10 g of dry vegetation were installed in each site. At 14, 28, 42, 56, and 70 days after the beginning of the experiment, five bags from each site were collected. Macroinvertebrates were identified and classified by functional trophic group. The number of species of benthic macroinvertebrates increased:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Aqualf; Biomass degradation; Ecosystem services; Nutrient cycling; Paddy soils.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000400261

Soil carbon and nitrogen mineralization caused by pig slurry application under different soil tillage systems
Provedor de dados: 86
Autores: Balota,Elcio Liborio; Machineski,Oswaldo; Truber,Priscila Viviane.
The objective of this work was to evaluate the change in soil C and N mineralization due to successive pig slurry application under conventional tillage (CT) and no tillage (NT) systems. The experiment was carried out in a clayey Latossolo Vermelho eutrófico (Rhodic Eutrudox) in Palotina, PR, Brazil. Increasing doses of pig slurry (0, 30, 60 and 120 m³ ha-1 per year) were applied in both tillage systems, with three replicates. Half of the pig slurry was applied before summer soil preparation, and the other half before the winter crop season. The areas were cultivated with soybean (Glycine max L.) and maize (Zea mays L.) in the summers of 1998 and 1999, respectively, and with wheat (Triticum sativum Lam.) in the winters of both years. Soil samples were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conventional tillage; No tillage; Nutrient cycling; Potential mineralization; Swine manure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000500011

Litterfall and litter nutrient content in two Brazilian Tropical Forests
Provedor de dados: 88
Autores: MORAES,REGINA MARIA DE; DELITTI,WELINGTON BRAZ CARVALHO; STRUFFALDI-DE VUONO,YARA.
Litterfall and transfer of nutrients was estimated in two tropical coastal forests of Brazil - the Atlantic and the Restinga Forests at Cardoso Island, São Paulo. Samples were collected monthly, from June 1990 to May 1991, using thirty 0.25 m2 traps. There were significant differences in litter production between the Atlantic Forest (6.3 t.ha-1.year-1) and the Restinga Forest (3.9 t.ha-1.year-1). Litterfall was continuous throughout the year with maximum in the beginning of the rainy season in both sites. The annual return of mineral elements through litter in the Atlantic Forest was (kg.ha-1): 101.8 N, 3.8 P, 20.3 K, 60.0 Ca, 18.0 Mg, and 14.6 S and in the Restinga Forest was: 27.5 N, 1.0 P, 6.5 K, 30.0 Ca, 10.9 Mg, and 6.6 S. The return, although small,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litterfall; Litter nutrient content; Nutrient cycling; Tropical rain forest; Restinga forest.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000100002

Nutrient cycling disturbance in Atlantic Forest sites affected by air pollution coming from the industrial complex of Cubatão, Southeast Brazil
Provedor de dados: 88
Autores: DOMINGOS,MARISA; LOPES,MÁRCIA INÊS MARTIN SILVEIRA; STRUFFALDI-DE VUONO,YARA.
Several aspects of nutrient cycling were studied at two sites of Atlantic Forest, in São Paulo State, Southeast Brazil (23o46’ S; 46o18’ W), which exhibited different degrees of forest structure decline caused by the air pollution emitted by the industrial complex of Cubatão, being referred here as the most and least affected sites (MAS and LAS, respectively). These investigations were developed during 1984 - 1986, a period in which the most severe negative effects of air pollution could be observed. Concentrations and amounts of N, P, K, Ca, Mg and S in four ecosystem compartments (leaves, litter layer, soil and roots) and in rainfall, throughfall and litterfall are briefly presented. At each site, the content of mineral elements generally decreased from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution effects; Nutrient cycling; Atlantic Forest; Cubatão.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100009

Summer Cover Crops Shoot Decomposition and Nitrogen Release in a No-Tilled Sandy Soil
Provedor de dados: 90
Autores: Weiler,Douglas Adams; Giacomini,Sandro José; Aita,Celso; Schmatz,Raquel; Pilecco,Getúlio Elias; Chaves,Bruno; Bastos,Leonardo Mendes.
ABSTRACT Cover crops have numerous benefits when used in a no-till system. Understanding the processes of decomposition and N release of summer cover crops (SCC) may help select species and management to be used in cropping systems. This study aimed to evaluate C and N loss of SCC shoots. Six SCCs were evaluated: velvet bean (Mucuna aterrima), pearl millet (Pennisetum americanum), dwarf pigeon pea (Cajanus cajan), sunn hemp (Crotalaria juncea), showy rattlebox (Crotalaria spectabilis), and jack bean (Canavalia ensiformis). The experiment was conducted for two years under no-till in soil classified as Typic Hapludalf (Argissolo). The C and N remaining of crop shoots were evaluated for 140 days using litter bags and the results were fitted with a simple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Legumes; Cropping system; Crop residue; Nutrient cycling.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100414

Green manure in coffee systems in the region of Zona da Mata, Minas Gerais: characteristics and kinetics of carbon and nitrogen mineralization
Provedor de dados: 90
Autores: Matos,Eduardo da Silva; Mendonça,Eduardo de Sá; Lima,Paulo César de; Coelho,Marino Salgarello; Mateus,Renato Faria; Cardoso,Irene Maria.
The use of green manure may contribute to reduce soil erosion and increase the soil organic matter content and N availability in coffee plantations in the Zona da Mata, State of Minas Gerais, in Southeastern Brazil. The potential of four legumes (A. pintoi, C. mucunoides, S. aterrimum and S. guianensis) to produce above-ground biomass, accumulate nutrients and mineralize N was studied in two coffee plantations of subsistence farmers under different climate conditions. The biomass production of C. mucunoides was influenced by the shade of the coffee plantation. C. mucunoides tended to mineralize more N than the other legumes due to the low polyphenol content and polyphenol/N ratio. In the first year, the crop establishment of A. pintoi in the area took...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroecology Atlantic Forest leguminous species N2 fixation; Nutrient cycling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000500024

Calibration of the century, apsim and ndicea models of decomposition and n mineralization of plant residues in the humid tropics
Provedor de dados: 90
Autores: Nascimento,Alexandre Ferreira do; Mendonça,Eduardo de Sá; Leite,Luiz Fernando Carvalho; Neves,Júlio Cesar Lima.
The aim of this study was to calibrate the CENTURY, APSIM and NDICEA simulation models for estimating decomposition and N mineralization rates of plant organic materials (Arachis pintoi, Calopogonium mucunoides, Stizolobium aterrimum, Stylosanthes guyanensis) for 360 days in the Atlantic rainforest bioma of Brazil. The models´ default settings overestimated the decomposition and N-mineralization of plant residues, underlining the fact that the models must be calibrated for use under tropical conditions. For example, the APSIM model simulated the decomposition of the Stizolobium aterrimum and Calopogonium mucunoides residues with an error rate of 37.62 and 48.23 %, respectively, by comparison with the observed data, and was the least accurate model in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Legumes; Nutrient cycling; Organic farming; Plant production.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300026

Decomposition and nutrient release of leguminous plants in coffee agroforestry systems
Provedor de dados: 90
Autores: Matos,Eduardo da Silva; Mendonça,Eduardo de Sá; Cardoso,Irene Maria; Lima,Paulo César de; Freese,Dirk.
Leguminous plants used as green manure are an important nutrient source for coffee plantations, especially for soils with low nutrient levels. Field experiments were conducted in the Zona da Mata of Minas Gerais State, Brazil to evaluate the decomposition and nutrient release rates of four leguminous species used as green manures (Arachis pintoi, Calopogonium mucunoides, Stizolobium aterrimum and Stylosanthes guianensis) in a coffee agroforestry system under two different climate conditions. The initial N contents in plant residues varied from 25.7 to 37.0 g kg-1 and P from 2.4 to 3.0 g kg-1. The lignin/N, lignin/polyphenol and (lignin+polyphenol)/N ratios were low in all residues studied. Mass loss rates were highest in the first 15 days, when 25 % of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient cycling; Agroecology; Plant residue; Residue quality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100013

Biomass decomposition and nutrient release from black oat and hairy vetch residues deposited in a vineyard
Provedor de dados: 90
Autores: Ferreira,Paulo Ademar Avelar; Girotto,Eduardo; Trentin,Gustavo; Miotto,Alcione; Melo,George Wellington de; Ceretta,Carlos Alberto; Kaminski,João; Frari,Bianca Knebel Del; Marchezan,Carina; Silva,Lincon Oliveira Stefanello; Faversani,Jéssica Carolina; Brunetto,Gustavo.
A significant quantity of nutrients in vineyards may return to the soil each year through decomposition of residues from cover plants. This study aimed to evaluate biomass decomposition and nutrient release from residues of black oats and hairy vetch deposited in the vines rows, with and without plastic shelter, and in the between-row areas throughout the vegetative and productive cycle of the plants. The study was conducted in a commercial vineyard in Bento Gonçalves, RS, Brazil, from October 2008 to February 2009. Black oat (Avena strigosa) and hairy vetch (Vicia villosa) residues were collected, subjected to chemical (C, N, P, K, Ca, and Mg) and biochemical (cellulose - Cel, hemicellulose - Hem, and lignin - Lig content) analyses, and placed in litter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cover crops; Nutrient cycling; Plastic shelter; Vitis sp.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500027

Soil Fertility and Electrical Conductivity Affected by Organic Waste Rates and Nutrient Inputs
Provedor de dados: 90
Autores: Carmo,Davi Lopes do; Lima,Laís Botelho de; Silva,Carlos Alberto.
ABSTRACT The composition of organic waste (OW) and its effect on soil processes may change soil fertility and electrical conductivity (EC). The side effects of waste use in crop fertilization are poorly understood for Brazilian soils. This study examined the effect of the addition of 15 different organic wastes to Oxisols and a Neosol on pH, base saturation, EC, cation exchange capacity (CEC at pH 7), and the availability of Al, macro (P, K, Ca2+, Mg2+ and S) and micronutrients (B, Fe2+, Mn2+, Cu2+ and Zn2+). Soil samples (150 g) were treated with chicken, pig, horse, cattle, and quail manures, sewage sludge 1 and 2, eucalyptus sawdust, plant substrate, coconut fiber, pine bark, coffee husk, peat, limed compost, and biochar. Wastes were added considering a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic fertilization; Manures; Liming value; Micronutrients; Nutrient cycling; Sewage sludge.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100532

Soil microbial biomass under different management and tillage systems of permanent intercropped cover species in an orange orchard
Provedor de dados: 90
Autores: Balota,Elcio Liborio; Auler,Pedro Antonio Martins.
To mitigate soil erosion and enhance soil fertility in orange plantations, the permanent protection of the inter-rows by cover species has been suggested. The objective of this study was to evaluate alterations in the microbial biomass, due to different soil tillage systems and intercropped cover species between rows of orange trees. The soil of the experimental area previously used as pasture (Brachiaria humidicola) was an Ultisol (Typic Paleudult) originating from Caiuá sandstone in the northwestern part of the State of Paraná, Brazil. Two soil tillage systems were evaluated: conventional tillage (CT) in the entire area and strip tillage (ST) (strip width 2 m), in combination with different ground cover management systems. The citrus cultivar 'Pera'...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial activity; Soil tillage; Nutrient cycling; Citrus management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600004

Cover Crops Effects on Soil Chemical Properties and Onion Yield
Provedor de dados: 90
Autores: Oliveira,Rodolfo Assis de; Brunetto,Gustavo; Loss,Arcângelo; Gatiboni,Luciano Colpo; Kürtz,Claudinei; Müller Júnior,Vilmar; Lovato,Paulo Emílio; Oliveira,Bruno Salvador; Souza,Monique; Comin,Jucinei José.
ABSTRACT Cover crops contribute to nutrient cycling and may improve soil chemical properties and, consequently, increase crop yield. The aim of this study was to evaluate cover crop residue decomposition and nutrient release, and the effects of these plants on soil chemical properties and on onion (Allium cepa L.) yield in a no-tillage system. The experiment was carried out in an Inceptisol in southern Brazil, where cover crops were sown in April 2012 and 2013. In July 2013, shoots of weeds (WD), black oats (BO), rye (RY), oilseed radish (RD), oilseed radish + black oats (RD + BO), and oilseed radish + rye (RD + RY) were cut at ground level and part of these material from each treatment was placed in litter bags. The litter bags were distributed on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Nutrient cycling; No-till system.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100520

Calcium and Magnesium Released from Residues in an Integrated Crop-Livestock System under Different Grazing Intensities
Provedor de dados: 90
Autores: Assmann,Joice Mari; Martins,Amanda Posselt; Anghinoni,Ibanor; Costa,Sergio Ely Valadão Gigante de Andrade; Franzluebbers,Alan Joseph; Carvalho,Paulo César de Faccio; Silva,Francine Damian da; Costa,Álvaro Araujo.
ABSTRACT Under integrated crop-livestock production systems (ICLS), plant and animal residues are important nutrient stocks for plant growth. Grazing management, by affecting the numbers of both plants and animals and the quality of residues, will influence nutrient release rates. The objective of this study was to evaluate the impact of grazing intensity on Ca and Mg release from pasture, dung, and soybean residues in a long-term no-till integrated soybean-cattle system. The experiment was established in May 2001 in a Latossolo Vermelho Distroférrico (Rhodic Hapludox). Treatments were a gradient of grazing intensity, determined by managing a black oat + Italian ryegrass pasture at 10, 20, 30, and 40 cm grazing height and no-grazing (NG), followed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mixed pasture; Animal residue; Half-life time; Nutrient cycling.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100512

Nitrate role in basic cation leaching under no-till
Provedor de dados: 90
Autores: Crusciol,Carlos Alexandre Costa; Garcia,Rodrigo Arroyo; Castro,Gustavo Spadotti Amaral; Rosolem,Ciro Antonio.
Especially under no-tillage, subsuface soil acidity has been a problem, because it depends on base leaching, which has been associated with the presence of low molecular weigth organic acids and companion anions. The objective of this study was to evaluate exchangeable base cation leaching as affected by surface liming along with annual urea side-dressing of maize and upland rice. Treatments consisted of four lime rates (0, 1500, 3000, and 6000 kg ha-1) combined with four nitrogen rates (0, 50, 100, and 150 kg ha-1) applied to maize (Zea mays) and upland rice (Oryza sativa), in two consecutive years. Maize was planted in December, three months after liming. In September of the following year, pearl millet (Pennisetum glaucum) was planted without...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lime; Nitrogen fertilization; Nutrient cycling; Tropical soils.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600014

Nitrogen washing from C3 and C4 cover grasses residues by rain
Provedor de dados: 90
Autores: Rosolem,Ciro Antonio; Werle,Rodrigo; Garcia,Rodrigo Arroyo.
Crop species with the C4 photosynthetic pathway are more efficient in assimilating N than C3 plants, which results in different N amounts prone to be washed from its straw by rain water. Such differences may affect N recycling in agricultural systems where these species are grown as cover crops. In this experiment, phytomass production and N leaching from the straw of grasses with different photosynthetic pathways were studied in response to N application. Pearl millet (Pennisetum glaucum) and congo grass (Brachiaria ruziziensis) with the C4 photosynthetic pathway, and black oat (Avena Strigosa) and triticale (X Triticosecale), with the C3 photosynthetic pathway, were grown for 47 days. After determining dry matter yields and N and C contents, a 30 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cover crops; Nitrogen fertilization; Nutrient cycling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600014

Sustainability of Wood Productivity of Pinus TaedaBased on Nutrient Export and Stocks in the Biomass and in the Soil
Provedor de dados: 90
Autores: Sixel,Ricardo Michael de Melo; Arthur Junior,José Carlos; Gonçalves,José Leonardo de Moraes; Alvares,Clayton Alcarde; Andrade,Gabriel Ramatis Pugliese; Azevedo,Antonio Carlos; Stahl,James; Moreira,Antônio Maurício.
ABSTRACT The impact of intensive management practices on the sustainability of forest production depends on maintenance of soil fertility. The contribution of forest residues and nutrient cycling in this process is critical. A 16-year-old stand of Pinus taeda in a Cambissolo Húmico Alumínico léptico (Humic Endo-lithic Dystrudept) in the south of Brazil was studied. A total of 10 trees were sampled distributed in five diameter classes according to diameter at breast height. The biomass of the needles, twigs, bark, wood, and roots was measured for each tree. In addition to plant biomass, accumulated plant litter was sampled, and soil samples were taken at three increments based on sampling depth: 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-1.00, 1.00-1.40,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fertility; Nutrient cycling; Forest management.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501416

Enzymatic activity and mineralization of carbon and nitrogen in soil cultivated with coffee and green manures
Provedor de dados: 90
Autores: Balota,Elcio Liborio; Chaves,Julio César Dias.
There are great concerns about degradation of agricultural soils. It has been suggested that cultivating different plant species intercropped with coffee plants can increase microbial diversity and enhance soil sustainability. The objective of this study was to evaluate enzyme activity (urease, arylsulfatase and phosphatase) and alterations in C and N mineralization rates as related to different legume cover crops planted between rows of coffee plants. Soil samples were collected in a field experiment conducted for 10 years in a sandy soil in the North of Paraná State, Brazil. Samples were collected from the 0-10 cm layer, both from under the tree canopy and in-between rows in the following treatments: control, Leucaena leucocephala, Crotalaria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil enzymes; Mineralization potential; Green manure; Mulching; Nutrient cycling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500010

Soil microbial biomass under different tillage and levels of applied pig slurry
Provedor de dados: 91
Autores: Balota,Elcio L.; Machineski,Oswaldo; Matos,Maria A.
ABSTRACT The objective of this work was to evaluate the changes in microbial biomass C, N and P due to the application of pig slurry under different soil tillage systems. The experiment was established in a clayey Oxisol, Eutrophic Red Latossol in Palotina, PR. Different quantities of pig slurry (0, 30, 60 and 120 m3 ha-1 year-1) were applied to the soil prior to the summer and winter crop season under conventional tillage (CT) and no tillage (NT), in three replicates. The area was cultivated with soybean (Glycine max L.) or maize (Zea mays L.) in the summer and wheat (Triticum sativum Lam.) or oat (Avena sativa L.) in the winter. The soil samples were collected in March and October of 1998 and 1999 at depths of 0-5, 5-10 and 10-20 cm. The soil tillage and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial activity; Swine manure; Soil management; Nutrient cycling.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012000500004

Agronomic performance of lettuce subjected to green manure with different leguminous species
Provedor de dados: 91
Autores: Sarmento,José J. A.; Santos,José J. F. dos; Costa,Caciana C.; Bomfim,Marinês P.
ABSTRACT Green manure is the practice of cultivation and incorporation of plants to the soil, mainly leguminous species, produced or not in situ, for the purpose of preserving and/or restoring soil organic matter and soil nutrients. To compare the effects of incorporating leguminous species in the pre-planting green manure on lettuce production, seven treatments were tested: mineral fertilization; crotalaria (Crotalaria juncea); cowpea (Vigna unguiculata); common bean (Phaseolus vulgaris); lablab bean (Dolichos lablab); pigeon pea (Cajanus cajan) and spontaneous plants. The treatments were arranged in the randomized blocks, with five repetitions. The experiment was conducted in the experimental area of the CCTA/UFCG, in the period from April to December...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Nutrient cycling; Plant nutrition; Yield.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000200114

Nutrient accumulation in Eucalyptus bark at different population densities
Provedor de dados: 91
Autores: Martins,Thales G. V.; Rocha,Maria F. V.; Nieri,Erick M.; Melo,Lucas A. de; Silva,Maria L. de S.; Silva,Diana S. N. da.
ABSTRACT The objective of this study was to quantify the accumulation of nutrients in the bark of four eucalyptus clones at 12 years-of-age, planted at different population densities, and the values were extrapolated to kg of nutrients per hectare. The experiment used randomized blocks in a 4 × 3 factorial design and three replications, with four Eucalyptus clones (2486, I182, I144, and GG100) planted at three population densities (416, 833, and 1111 trees ha-1). The rigorous cubage of three trees per plot was performed by collecting discs of bark at the following heights: diameter at breast height (1.30 m), 0, 25, 50, 75, and 100% of the commercial height of the stem. The bark discs of each tree were grouped and used to determine N, P, K, Ca, Mg, and S...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compartmentalization; Nutrient cycling; Spacing.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100040

Soil carbon and nitrogen mineralization under different tillage systems and Permanent Groundcover cultivation between Orange trees
Provedor de dados: 94
Autores: Balota,Elcio Liborio; Auler,Pedro Antonio Martins.
The objective of this work was to evaluate the alterations in carbon and nitrogen mineralization due to different soil tillage systems and groundcover species for intercropped orange trees. The experiment was established in an Ultisol soil (Typic Paleudults) originated from Caiuá sandstone in northwestern of the state of Paraná, Brazil, in an area previously cultivated with pasture (Brachiaria humidicola). Two soil tillage systems were evaluated: conventional tillage (CT) in the entire area and strip tillage (ST) with a 2-m width, each with different groundcover vegetation management systems. The citrus cultivar utilized was the 'Pera' orange (Citrus sinensis) grafted onto a 'Rangpur' lime rootstock. The soil samples were collected at a 0-15-cm depth after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potential mineralization; Soil management; Vegetable cover; Nutrient cycling.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000200037

Environmental impacts and nutrient recycling on pastures grazed by cattle
Provedor de dados: 96
Autores: Vendramini,J.M.B.; Silveira,M.L.A.; Dubeux Jr.,J.C.B.; Sollenberger,L.E.
Grasslands are being replaced by urbanization and more profitable agricultural activities around the world. Producers may be faced with land constraints and need to consider intensification of the remaining grasslands as a means of maintaining overall production on a decreasing land resource. However, intensification of the grazing system is usually associated with greater nutrient inputs, including those from commercial fertilizers and supplement fed to animals. Excessive loading of nutrients in intensive grazing systems via fertilizer and animal wastes can cause nutrient buildup in the soil and subsequent water quality problems. Surface runoff and leaching of nutrients are the two major process affecting water quality. Nitrogen and P represent major...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Forage; Grassland; Nutrient cycling; Water quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007001000015

Spatial distribution of feces and estimates of nitrogen return by dairy cows on mombasa grass pastures
Provedor de dados: 96
Autores: Silva,Rodrigo Gregório da; Neiva,José Neuman Miranda; Santos,Antonio Clementino dos; Cândido,Magno José Duarte; Sousa,Antonio Luiz Dias; Lopes,Marcos Neves; Silva,Rafael de Oliveira da; Carneiro,Leovegildo Caldas.
The objective of this study was to identify the pattern of deposition of feces by supplemented crossbred dairy cows after the lactation peak on cultivated areas under levels of intensification of the system and its effects on nitrogen cycling, with the aid of geostatistics, in the rainy period. Treatments were composed of two levels of nitrogen fertilization (equivalent to 400 and 800 kg N/ha/year) and two types of animals, according to the daily milk production. Geostatistical and descriptive analyses of the data were conducted. The data presented positive coefficients of skewness and platykurtic kurtosis. For the coefficient of variation, there was elevated alteration, with rest areas showing higher values and paddocks with a higher level of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Nitrogen fertilization; Nutrient cycling; Pasture; Supplementation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000500010

Tree legumes: an underexploited resource in warm-climate silvopastures
Provedor de dados: 96
Autores: Dubeux Junior,José Carlos Batista; Muir,James P.; Apolinário,Valéria Xavier de Oliveira; Nair,P. K. Ramachandran; Lira,Mario de Andrade; Sollenberger,Lynn E.
ABSTRACT Tree legumes are an underexploited resource in warm-climate silvopastures. Perceived benefits of tree legumes include provisioning (browse/mast, timber, fuel, human food, natural medicines, and ornamentals), regulating (C sequestration, greenhouse gas mitigation, soil erosion control and riparian buffers, shade, windbreaks, and habitat for pollinators), supporting (biological N2-fixation, nutrient cycling, soil fertility and soil health, photosynthesis, and primary productivity), and cultural ecosystem services. Tree legumes, however, have not been assessed to the same extent as herbaceous legumes. Once tree legumes are established, they are often more persistent than most herbaceous legumes. There are limitations for extended research with tree...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological N2 fixation; Ecosystem services; Grassland; Nutrient cycling; Tropical.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000800689

Production of organic compost from different plant waste generated in the management of a green urban space
Provedor de dados: 124
Autores: Silva,Carlos Henrique Corrêa da; Rocha,Fernanda Cipriano; Silva,Lusimar Lamarte Gonzaga Galindo da.
ABSTRACT Plant waste generated in a properly treated arboretum promotes nutrient cycling, reducing the volume of the residue. The aim of this study was to evaluate the potential of plant waste generated in the management of the Botanical Gardens of Rio de Janeiro, Brazil, for the production of organic composts. An experiment was carried out over 110 days to compost leaves, shredded twigs and leaves, shredded twigs and leaves plus manure, blades of grass, and aquatic plants, to determine influence factors and the levels of N, P and K. The experimental design was completely randomised with five treatments and four replications. The manure had an influence on the decomposition of the shredded plant waste. The shredded waste plus manure, blades of grass and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composting; Green waste; Nutrient cycling.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000400558

Calibration and validation of models for short-term decomposition and N mineralization of plant residues in the tropics
Provedor de dados: 63
Autores: Nascimento,Alexandre Ferreira do; Mendonça,Eduardo de Sá; Leite,Luiz Fernando Carvalho; Scholberg,Johannes; Neves,Julio Cesar Lima.
Insight of nutrient release patterns associated with the decomposition of plant residues is important for their effective use as a green manure in food production systems. Thus, this study aimed to evaluate the ability of the Century, APSIM and NDICEA simulation models for predicting the decomposition and N mineralization of crop residues in the tropical Atlantic forest biome, Brazil. The simulation models were calibrated based on actual decomposition and N mineralization rates of three types of crop residues with different chemical and biochemical composition. The models were also validated for different pedo-climatic conditions and crop residues conditions. In general, the accuracy of decomposition and N mineralization improved after calibration. Overall...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Nutrient cycling; Organic agriculture; Soil organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600008

Soil water dynamics and litter production in eucalypt and native vegetation in southeastern Brazil
Provedor de dados: 63
Autores: Silva,Paulo Henrique Muller da; Poggiani,Fabio; Lima,Walter de Paula; Libardi,Paulo Leonel.
High productivity of eucalypt plantations is the result of advances in research that have led to gradual improvements in intensive silvicultural technology. High productivity notwithstanding, eucalypt plantations remain the focus of environmental concerns. Our study aimed to compare the soil water regime, litter fall and nutrients dynamics either in a fragment of native forest or in an adjacent stand of growing eucalypt. We took field measurements during the first three years of eucalypt plantation in a sandy soil in the southeastern region of Brazil. Soil moisture and internal drainage were higher during the early stages of growth of the eucalypt stand, as compared with native vegetation. However, one and a half years after planting, available soil water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Initial growth; Soil water flow; Soil solution; Nutrient cycling.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500005

Soil exchangeable cations, sugarcane production and nutrient uptake after wastewater irrigation
Provedor de dados: 63
Autores: Leal,Rafael Marques Pereira; Firme,Lilian Pittol; Montes,Célia Regina; Melfi,Adolpho José; Piedade,Sonia Maria De Stefano.
Wastewater irrigation may benefit agricultural crops with water and essential nutrients (mainly nitrogen), also affecting soil chemistry. The effects of effluent irrigation on yield, stalk nutrient uptake and on soil chemistry over 16 months were studied in a sugarcane (Saccharum spp.) crop growing on an Oxisol in Lins, State of São Paulo, Brazil. Irrigated plots received 50% of the recommended mineral-N fertilization and 100, 125, 150 or 200% of the crop water demand, while control plots received neither additional N nor water. The high sodium content of effluent resulted in Na inputs as high as 6.2 t ha-1, along with 1497 kg N ha-1 and 628 kg K ha-1. All the effluent plots except the T125 treatment had higher yields (up to 247 t ha-1) than the control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Water reuse; Land disposal; Nutrient cycling.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200014

Waste management of pseudostem to increase the growth of banana seedlings
Provedor de dados: 109
Autores: Domingues Lima.,Juliana; de Souza Bravo.,Natália; Rozane.,Danilo Eduardo; Nomura.,Edson Shigueaki; Gorla da Silva.,Silvia Helena Modenese; Gomes,Eduardo Nardini.
Abstract Pseudostem is an abundant residue after harvesting of the banana bunch, serving as a source of water, nutrients and organic substances. The present study aimed to evaluate the effect of pseudostem waste on ‘Nanica’ banana (Musa spp. AAA) cultivar in greenhouse under contrasting environmental conditions. For this, an experiment was carried out in in the Sao Paulo State University -UNESP in a randomized block design in a 2 x 2 factorial scheme (presence or absence of waste and two seasons), consisting of four replicates of three experimental plots with two pots per plant. One season was early November/2018 (Summer) and the other half of May/2019 (Winter). A 40 cm portion of the pseudostem collected from of a freshly harvested plant was sectioned...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetables residues; Nutrient cycling; Growth promoting substances.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122020000300228

Litterfall production in intact and selectively logged forests in southern of Amazonia as a function of basal area of vegetation and plant density
Provedor de dados: 36
Autores: ALMEIDA,Everton José; LUIZÃO,Flávio; RODRIGUES,Domingos de Jesus.
Nutrient recycling in the forest is linked to the production and decomposition of litter, which are essential processes for forest maintenance, especially in regions of nutritionally poor soils. Human interventions in forest such as selecttive logging may have strong impacts on these processes. The objectives of this study were to estimate litterfall production and evaluate the influence of environmental factors (basal area of vegetation, plant density, canopy cover, and soil physicochemical properties) and anthropogenic factors (post-management age and exploited basal area) on this production, in areas of intact and exploited forest in southern Amazonia, located in the northern parts of Mato Grosso state. This study was conducted at five locations and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transition forest; Nutrient cycling; Selective logging; Forest management.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200157

Laboratory decomposition of Dalbergia nigra all. ex. benth and Eucalyptus grandis w.hill ex. maiden leaves in forest and eucalypt plantation soils
Provedor de dados: 39
Autores: Rezende,Juliana L. P.; Garcia,Queila S.; Scotti,Maria Rita M. M. L.
The objective was to evaluate the decomposition of D. nigra and E. grandis leaves under laboratory conditions when incubated in soils from Atlantic Forest and from a 40-year-old eucalypt plantation for a year. The obtained values of pH in forest and eucalypt plantation soils were 5.61 and 4.47 and for aluminum 0.32 and 1.89mEqx100, respectively. A great number of microorganisms (total fungi, phosphate solubilising and cellulolytic organisms) were found in forest soil. Litterbag study revealed a higher mass loss of the leaves in forest soil in the first four months (c. 30%). In the eucalypt plantation soils loss was observed only after eight months (c. 40%). The initial contents of N and P were greater in D. nigra than in E. grandis leaves, although lignin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dalbergia; Eucalyptus; Nutrient cycling; Decomposition.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062001000300002

Soil enzyme activities under pig slurry addition and different tillage systems - doi: 10.4025/actasciagron.v33i4.9816
Provedor de dados: 1
Autores: Balota, Elcio Liborio; Instituto Agronômico do Paraná; Machineski, Oswaldo; Instituto Agronômico do Paraná; Truber, Priscila Viviane; Instituto Agronômico do Paraná.
The objective of this work was to evaluate the changes in soil enzyme activities due to application of pig slurry under different soil tillage systems. The experiment was conducted in a clayey Oxisol in Palotina, PR, using different quantities of pig slurry (0, 30, 60 and 120 m3 ha-1 year-1) applied to the soil prior to the summer and winter crop season under conventional tillage (CT) and no tillage (NT), with three replicates. The areas were cultivated with soybean (Glycine max L.) and maize (Zea mays L.) in the summers of 1998 and 1999, respectively, and with wheat (Triticum sativum Lam.) in the winters of both years. The soil samples were collected in March and October of 1998 and 1999 at depths of 0-5, 5-10 and 10-20 cm. The pig slurry application and...
Tipo: Pesquisa de Campo
Palavras-chave: Agrárias  Microbiologia e Bioquimica do Solo Arylsulfatase; Acid phosphatase; Swine manure; No-tillage systems; Nutrient cycling Arylsulfatase; Acid phosphatase; Swine manure; No-tillage systems; Nutrient cycling.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/9816

Fitomassa, teor e acúmulo de micronutrientes do milheto, feijão-de-porco e guandu-anão, em cultivo solteiro e consorciado - DOI: 10.4025/actasciagron.v30i4.5314
Provedor de dados: 1
Autores: Teixeira, Cícero Monti; EPAMIG; Carvalho, Gabriel José de; UFLA; Andrade, Messias José Bastos de; UFLA; Furtini Neto, Antônio Eduardo; UFLA.
O consórcio entre gramíneas e leguminosas para produção de palha, no sistema plantio direto, visa conciliar a proteção do solo, por meio da maior durabilidade da gramínea, com a fixação de N e disponibilização mais rápida de nutrientes pela decomposição da leguminosa. Diante disso, instalou-se um experimento para determinar a produção de fitomassa e o teor e acúmulo de micronutrientes do milheto, feijão-de-porco e guandu-anão, em cultivo solteiro e nos consórcios da gramínea com as leguminosas, para a produção de palha no plantio direto. O trabalho foi conduzido no campo experimental do Departamento de Agricultura da Universidade Federal de Lavras – Lavras, Estado de Minas Gerais. O delineamento foi o de blocos casualizados, com sete tratamentos, para os...
Palavras-chave: 5.01.00.00-9    Agronomia plantio direto; Adubação verde; Micronutrientes; Ciclagem de nutrientes. no-tillage; Green manuring; Micronutrients; Nutrient cycling.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5314

Nutrient retranslocation in forest species in the Brazilian Amazon
Provedor de dados: 1
Autores: Machado, Murilo Rezende; Sampaio, Paulo de Tarso Barbosa; Ferraz, João; Camara, Rodrigo; Pereira, Marcos Gervasio.
Internal retranslocation is an important mechanism for nutrient conservation in plants, which depends on different factors. However, there are little data about this subject, especially on tropical forest species. This study aimed to evaluate the macronutrient retranslocation dynamic and the influence of ecological (P: pioneer x NP: non-pioneer) and phenological (ND: non-deciduous x D: semideciduous / deciduous) characteristics on the macronutrient content of leaves of five tree species on monospecific plantations in the Brazilian Amazon: Acacia mangium Willd., Parkia decussata Ducke, Dipteryx odorata (Aublet) Willd., Jacaranda copaia (Aubl.) D. Don and Swietenia macrophylla King. Photosynthetically active green leaves and senescent leaves (leaf litter)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.00.00.00-4 ecological groups; Litterfall; Nutrient cycling; Phenological groups; Plant nutrition Fertilidade do Solo e Adubação.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/26805

Drying Temperature - Duration Impacts on Moisture, Carbon, and Nitrogen Losses from Broiler Litter
Provedor de dados: 111
Autores: Shah, Sanjay B.
Drying poultry litter (PL) prior to analysis minimizes nutrient transformations and losses and facilitates sample preparation. Drying also allows comparison among different litters on dry-weight (dw) basis. However, losses of carbon (C) as CO2 and nitrogen (N) as NH3 (NH3) can confound moisture losses. Thus, the apparent moisture content (MC) that does not separately account for C and N losses will be higher than the true MC. Further, use of apparent MC may also result in overestimation of C and N concentrations (dw basis). Broiler litter (BL) MC was determined using FD 50 (flask-dried at 50°C for 24 h), FD 70 (flask-dried at 70°C for 16 h), CT70 (oven-dried at 70°C to constant mass), and CT105 (oven-dried at 105°C to constant mass). Carbon and NH3-N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste management; Nutrient cycling; Emissions; Pollution Poultry litter  moisture content; Ammonia loss; Carbon dioxide loss; Urea.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2801

Drying Temperature - Duration Impacts on Moisture, Carbon, and Nitrogen Losses from Broiler Litter
Provedor de dados: 111
Autores: Sanjay B. Shah; NC State University.
Drying poultry litter (PL) prior to analysis minimizes nutrient transformations and losses and facilitates sample preparation. Drying also allows comparison among different litters on dry-weight (dw) basis. However, losses of carbon (C) as CO2 and nitrogen (N) as NH3 (NH3) can confound moisture losses. Thus, the apparent moisture content (MC) that does not separately account for C and N losses will be higher than the true MC. Further, use of apparent MC may also result in overestimation of C and N concentrations (dw basis). Broiler litter (BL) MC was determined using FD 50 (flask-dried at 50°C for 24 h), FD 70 (flask-dried at 70°C for 16 h), CT70 (oven-dried at 70°C to constant mass), and CT105 (oven-dried at 105°C to constant mass). Carbon and NH3-N...
Palavras-chave: Waste management; Nutrient cycling; Emissions; Pollution Poultry litter  moisture content; Ammonia loss; Carbon dioxide loss; Urea.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2801

Matter turnover in the oligotrophic restinga ecosystem and the importance of the key species Clusia hilariana
Provedor de dados: 49
Autores: Brito,Letícia da Silva; Irmler,Ulrich; Forte,Bruno Vasconcelos Guimarães; Xavier,Tatiane Pereira; Martins,Rodrigo Lemes.
Abstract: Restingas are sandy areas spread along the Brazilian coast made up of a mosaic of forest and open woodland vegetation adapted to varying conditions of aridity, oligotrophy and salinity. Two vegetation types are very common in southeast Brazilian restingas, open Clusia formations and seasonally dry forest formation. Litter production and nutrient (C and N) turnover were studied comparatively in forest formations and Clusia formations, in vegetation patches with and without Clusia hilariana. The results showed that the breakdown process is extremely retarded in Clusia formations, with or without C. hilariana, leading to C accumulation in the soil. Microbial and soil fauna activity is lower in Clusia formations in comparison to forest formations;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal ecosystem; Decomposition litterfall; Nutrient cycling; Nurse plant.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400208

Microbial respiration and chemical composition of different sediment fractions in waterbodies of the upper Paraná River floodplain, Brazil
Provedor de dados: 57
Autores: THOMAZ,S. M.; PEREIRA,G.; PAGIORO,T. A.
Four size fractions of the sediment of six environments of the upper Paraná River floodplain were analyzed for carbon, nitrogen, and phosphorus contents and microbial respiration (oxygen consumption). Particle size did not affect nitrogen and phosphorus content or microbial activity, but did affect carbon content (F = 4.274, df = 3; 20, p = 0.020). The carbon concentration of ultra-fine particles was significantly lower than that of other sizes of sediment particles. Microbial respiration values were well predicted by sediment chemical composition, as shown by multiple regression (microbial respiration = -0.39 - 0.210C + 0.108N + 0.796P; F = 7.0495, p = 0.0022). However, phosphorus was the element which best explained the microbial respiration (partial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial respiration; Nutrient cycling; Floodplain; Sediment fractions; Paraná River.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200010

Land disposal potential of tobacco processing residues
Provedor de dados: 65
Autores: Tedesco,Marino José; Lauschner,Márcio Henrique; Gianello,Clesio; Bortolon,Leandro; Kray,Claudio Henrique.
Brazil is one of the leaders in the production and trading of tobacco leaves in the global market, which results in a large amount of residues that would be recycled and used as soil fertilizers in agriculture. This research aimed to study the land disposal potential and agricultural use of tobacco processing residues (TPRs), their mineralization and the nutrient supply to the plants. The study was carried out in an open area using pots with 32dm³ of a sandy soil (Paleudult), provided with water drainage collectors and tilled with three corn plants each. Eighteen treatments were tested with mineral fertilization, poultry manure (PM), earthworm compost (EC) and increasing rates (0, 7.5, 15, 30 e 60t ha-1) of TPR D (dust) and TPR S (stem fibers).Treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient cycling; Nitrogen; Water quality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000200009

Decomposition and nutrient release of leguminous green manure species in the Jaguaribe-Apodi region, Ceará, Brazil
Provedor de dados: 65
Autores: Pereira,Natanael Santiago; Soares,Ismail; Miranda,Fábio Rodrigues de.
ABSTRACT: The use of leguminous green manure can be an alternative for the region agricultural systems due to its ability to incorporate significant amounts of nutrients into the soil through decomposition and nutrient release from biomass. This study aimed to evaluate the decomposition rates and nutrient release of six leguminous green manure species ( Crotalaria juncea , Canavalia ensiformes , Cajanus cajan , Crotalaria spectabilis ,  Dolichos lablab and Mucuna deeringiana ) in an area of the Jaguaribe-Apodi agricultural region, Brazil. Experiment was carried out under field conditions in a randomized block design with five replications. Decomposition and nutrient release from leguminous biomass were monitored by sampling at 30, 60, 90, 120, 150 and 180...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineralization; Nutrient cycling; Plant residues.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000600970