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| Registros recuperados: 55 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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... |
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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 |
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| 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 |
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| 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 |
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| Registros recuperados: 55 | |
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