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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
03/06/2002 |
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Data da última atualização: |
07/11/2018 |
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Autoria: |
SCHAEFER, C. E. R.; SILVA, D. D.; PAIVA, K. W. N.; PRUSKI, F. F.; ALQUERQUE FILHO, M. R.; ALBUQUERQUE, M. A. |
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Afiliação: |
Carlos Ernesto Reynaud Schaefer, Universidade Federal de Viçosa - UFV/Departamento de Solos; Demétrius David Silva, Universidade Federal de Viçosa - UFV/Departamento de Engenharia Agrícola; Karlos Welby Neri Paiva, Universidade Federal de Viçosa - UFV/Departamento de Engenharia Agrícola; Fernando Falco Pruski, Universidade Federal de Viçosa - UFV/Departamento de Engenharia Agrícola; Manoel Ricardo Albuquerque Filho, Universidade Federal de Viçosa - UFV/Departamento de Solos; Miriam Abreu Albuquerque, Fundação Educacional de Caratinga/Centro de Pesquisas. |
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Título: |
Perdas de solo, nutrientes, matéria orgânica e efeitos microestruturais em gissolo Vermelho-Amarelo sob chuva simulada. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 5, p. 669-678, maio 2002 |
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Idioma: |
Português |
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Notas: |
Título em inglês: Soil, nutrient and organic matter losses in a Red-Yellow Podzolic under simulated rainfall. |
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Conteúdo: |
Estudo experimental com simulador de chuva foi conduzido em área de Argissolo Vermelho-Amarelo caulinítico, em Viçosa, MG, com intensidade de precipitação de 60 mm h-1 e seis aplicações sucessivas, espaçadas de 12 horas. Caracterizou-se a evolução do selamento superficial e das perdas de nutrientes, solo e matéria orgânica em razão de diferentes porcentagens de cobertura (0, 20, 40, 80 e 100%) em cultivo morro abaixo (declividade média de 9,5%), em resposta à energia cinética decorrente da precipitação. As perdas totais de solo foram superiores a 11 t ha-1 nos tratamentos com porcentagem de cobertura entre 0 e 40%, reduzindo-se a pouco mais de 5 t ha-1 com 80% até zero no tratamento 100% coberto com Bidim. As perdas de nutrientes seguiram a ordem Ca>Mg>K>P e foram correlacionadas às perdas de matéria orgânica. O fracionamento de substâncias húmicas revelou a concentração residual de humina e perdas seletivas de formas mais solúveis (ácidos fúlvicos) com a enxurrada. A erosão causou heterogeneidade entre a parte superior e inferior das parcelas experimentais. A macroporosidade entre 10 e 20 cm é maior na parte superior da parcela, sugerindo a migração de argila dispersa e entupimento de macroporos nas condições de chuva simulada. Excetuando-se o tratamento com 100% de cobertura, todos os demais evidenciam crosta deposicional. Nos tratamentos com maior exposição houve presença de crosta erosional, ao fim do teste de campo. |
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Palavras-Chave: |
Degradação do solo; Erosion; Porosidade do solo; Soil porosity. |
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Thesagro: |
Erosão; Permeabilidade. |
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Thesaurus Nal: |
permeability; soil degradation. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/22394/1/0669.pdf
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Marc: |
LEADER 02458naa a2200289 a 4500
001 1107322
005 2018-11-07
008 2002 bl uuuu u00u1 u #d
100 1 $aSCHAEFER, C. E. R.
245 $aPerdas de solo, nutrientes, matéria orgânica e efeitos microestruturais em gissolo Vermelho-Amarelo sob chuva simulada.
260 $c2002
500 $aTítulo em inglês: Soil, nutrient and organic matter losses in a Red-Yellow Podzolic under simulated rainfall.
520 $aEstudo experimental com simulador de chuva foi conduzido em área de Argissolo Vermelho-Amarelo caulinítico, em Viçosa, MG, com intensidade de precipitação de 60 mm h-1 e seis aplicações sucessivas, espaçadas de 12 horas. Caracterizou-se a evolução do selamento superficial e das perdas de nutrientes, solo e matéria orgânica em razão de diferentes porcentagens de cobertura (0, 20, 40, 80 e 100%) em cultivo morro abaixo (declividade média de 9,5%), em resposta à energia cinética decorrente da precipitação. As perdas totais de solo foram superiores a 11 t ha-1 nos tratamentos com porcentagem de cobertura entre 0 e 40%, reduzindo-se a pouco mais de 5 t ha-1 com 80% até zero no tratamento 100% coberto com Bidim. As perdas de nutrientes seguiram a ordem Ca>Mg>K>P e foram correlacionadas às perdas de matéria orgânica. O fracionamento de substâncias húmicas revelou a concentração residual de humina e perdas seletivas de formas mais solúveis (ácidos fúlvicos) com a enxurrada. A erosão causou heterogeneidade entre a parte superior e inferior das parcelas experimentais. A macroporosidade entre 10 e 20 cm é maior na parte superior da parcela, sugerindo a migração de argila dispersa e entupimento de macroporos nas condições de chuva simulada. Excetuando-se o tratamento com 100% de cobertura, todos os demais evidenciam crosta deposicional. Nos tratamentos com maior exposição houve presença de crosta erosional, ao fim do teste de campo.
650 $apermeability
650 $asoil degradation
650 $aErosão
650 $aPermeabilidade
653 $aDegradação do solo
653 $aErosion
653 $aPorosidade do solo
653 $aSoil porosity
700 1 $aSILVA, D. D.
700 1 $aPAIVA, K. W. N.
700 1 $aPRUSKI, F. F.
700 1 $aALQUERQUE FILHO, M. R.
700 1 $aALBUQUERQUE, M. A.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 37, n. 5, p. 669-678, maio 2002
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
20/11/2018 |
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Data da última atualização: |
08/08/2019 |
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Tipo da produção científica: |
Orientação de Tese de Pós-Graduação |
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Autoria: |
BOSI, C. |
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Afiliação: |
Cristiam Bosi, USP. |
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Título: |
Parameterization and evaluation of mechanistic crop models for estimating Urochloa brizantha cv. BRS Piatã productivity under full sun and in silvopastoral system. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
2017. 158 p. Tese (Doutorado em Engenharia de sistemas agrícolas) - Escola superior de agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, 2018. |
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Páginas: |
158 p. |
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DOI: |
10.11606/T.11.2018.tde-15052018-142008 |
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Idioma: |
Inglês |
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Notas: |
Co-orientador: José Ricardo Macedo Pezzopane, Embrapa Pecuária Sudeste. |
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Conteúdo: |
Silvopastoral systems are a kind of agroforestry system in which trees or shrubs are combined with animals and pastures. Silvopastoral systems are important to intensify pasture production and mitigate climate change effects. However, very few studies have been performed to adapt crop models to simulate these systems. The aim of this study was to parameterize and test the mechanistic crop models APSIM and CROPGRO for estimating Urochloa brizantha cv. BRS Piatã productivity under full sun and in a silvopastoral system, to evaluate the models' performance to simulate tree-crop interactions, and to develop tools to improve these simulations. For this purpose, four field experiments were conducted under full sun to investigate cutting management under irrigated and rainfed conditions and grazing management under rainfed conditions with high and low N supply. Another experiment was carried out in a silvopastoral system with the trees arranged in simple rows, in East-West orientation, with 15 m between rows and 2 m between plants in the rows. This experiment was conducted under grazing management and rainfed conditions with the pasture variables, microclimate and soil water content being assessed at four distances from the North row (0.00 m, 3.75 m, 7.50 m and 11.25 m). The forage mass simulations for the pasture at full sun, performed using the APSIM-Tropical Pasture model, showed good agreement between observed and estimated data (R2 between 0.82 and 0.97, d between 0.92 and 0.98, and NSE ranging from 0.72 to 0.92), while the simulations with the CROPGRO-Perennial Forage model achieved good precision (R2 between 0.65 and 0.93) and good accuracy (d from 0.86 to 0.97, and NSE from 0.60 to 0.90), for the various managements and environmental conditions. Even considering the promising performance of both models for pastures under full sun, they already needs to be tested in other locations, climate conditions, soils, and grazing or cutting intensities, to prove its accuracy and reach enough confidence. The pasture growth simulations at the silvopastoral system indicated that the APSIM-Tropical Pasture was efficient when only competition by solar radiation was considered (R2 from 0.69 to 0.88, d from 0.90 to 0.96, and NSE between 0.51 and 0.85), but inefficient when considering only competition by soil water (R2 between 0.58 and 0.85, d between 0.58 and 0.82, and NSE from -4.07 to -0.14). The CROPGRO-Perennial Forage achieved good performance on pasture growth simulation at the distances 0.00 m, 3.75 m, and 7.50 m from the trees (R2 from 0.75 to 0.90, d from 0.93 to 0.96, NSE between 0.74 and 0.85). Despite the good results, improvements should be performed in both models for simulating all factors that affect forage growth in silvopastoral systems. MenosSilvopastoral systems are a kind of agroforestry system in which trees or shrubs are combined with animals and pastures. Silvopastoral systems are important to intensify pasture production and mitigate climate change effects. However, very few studies have been performed to adapt crop models to simulate these systems. The aim of this study was to parameterize and test the mechanistic crop models APSIM and CROPGRO for estimating Urochloa brizantha cv. BRS Piatã productivity under full sun and in a silvopastoral system, to evaluate the models' performance to simulate tree-crop interactions, and to develop tools to improve these simulations. For this purpose, four field experiments were conducted under full sun to investigate cutting management under irrigated and rainfed conditions and grazing management under rainfed conditions with high and low N supply. Another experiment was carried out in a silvopastoral system with the trees arranged in simple rows, in East-West orientation, with 15 m between rows and 2 m between plants in the rows. This experiment was conducted under grazing management and rainfed conditions with the pasture variables, microclimate and soil water content being assessed at four distances from the North row (0.00 m, 3.75 m, 7.50 m and 11.25 m). The forage mass simulations for the pasture at full sun, performed using the APSIM-Tropical Pasture model, showed good agreement between observed and estimated data (R2 between 0.82 and 0.97, d between 0.92 and 0.9... Mostrar Tudo |
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Palavras-Chave: |
Agroflorestal; APSIM; CROPGRO. |
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Thesagro: |
Radiação Solar. |
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Thesaurus NAL: |
Soil water; Solar radiation. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/186383/1/Cristiam-Bosi-Tese.pdf
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Marc: |
LEADER 03680nam a2200217 a 4500
001 2099636
005 2019-08-08
008 2018 bl uuuu m 00u1 u #d
024 7 $a10.11606/T.11.2018.tde-15052018-142008$2DOI
100 1 $aBOSI, C.
245 $aParameterization and evaluation of mechanistic crop models for estimating Urochloa brizantha cv. BRS Piatã productivity under full sun and in silvopastoral system.$h[electronic resource]
260 $a2017. 158 p. Tese (Doutorado em Engenharia de sistemas agrícolas) - Escola superior de agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba$c2018
300 $a158 p.
500 $aCo-orientador: José Ricardo Macedo Pezzopane, Embrapa Pecuária Sudeste.
520 $aSilvopastoral systems are a kind of agroforestry system in which trees or shrubs are combined with animals and pastures. Silvopastoral systems are important to intensify pasture production and mitigate climate change effects. However, very few studies have been performed to adapt crop models to simulate these systems. The aim of this study was to parameterize and test the mechanistic crop models APSIM and CROPGRO for estimating Urochloa brizantha cv. BRS Piatã productivity under full sun and in a silvopastoral system, to evaluate the models' performance to simulate tree-crop interactions, and to develop tools to improve these simulations. For this purpose, four field experiments were conducted under full sun to investigate cutting management under irrigated and rainfed conditions and grazing management under rainfed conditions with high and low N supply. Another experiment was carried out in a silvopastoral system with the trees arranged in simple rows, in East-West orientation, with 15 m between rows and 2 m between plants in the rows. This experiment was conducted under grazing management and rainfed conditions with the pasture variables, microclimate and soil water content being assessed at four distances from the North row (0.00 m, 3.75 m, 7.50 m and 11.25 m). The forage mass simulations for the pasture at full sun, performed using the APSIM-Tropical Pasture model, showed good agreement between observed and estimated data (R2 between 0.82 and 0.97, d between 0.92 and 0.98, and NSE ranging from 0.72 to 0.92), while the simulations with the CROPGRO-Perennial Forage model achieved good precision (R2 between 0.65 and 0.93) and good accuracy (d from 0.86 to 0.97, and NSE from 0.60 to 0.90), for the various managements and environmental conditions. Even considering the promising performance of both models for pastures under full sun, they already needs to be tested in other locations, climate conditions, soils, and grazing or cutting intensities, to prove its accuracy and reach enough confidence. The pasture growth simulations at the silvopastoral system indicated that the APSIM-Tropical Pasture was efficient when only competition by solar radiation was considered (R2 from 0.69 to 0.88, d from 0.90 to 0.96, and NSE between 0.51 and 0.85), but inefficient when considering only competition by soil water (R2 between 0.58 and 0.85, d between 0.58 and 0.82, and NSE from -4.07 to -0.14). The CROPGRO-Perennial Forage achieved good performance on pasture growth simulation at the distances 0.00 m, 3.75 m, and 7.50 m from the trees (R2 from 0.75 to 0.90, d from 0.93 to 0.96, NSE between 0.74 and 0.85). Despite the good results, improvements should be performed in both models for simulating all factors that affect forage growth in silvopastoral systems.
650 $aSoil water
650 $aSolar radiation
650 $aRadiação Solar
653 $aAgroflorestal
653 $aAPSIM
653 $aCROPGRO
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