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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
09/02/1993 |
Data da última atualização: |
09/02/1993 |
Autoria: |
CARSKY, R. J. |
Título: |
Estimating a vailability of nitrogen from green manure to subsequent maize crops using a buried bag technique. |
Ano de publicação: |
1989 |
Fonte/Imprenta: |
Cornell: Cornell University, 1989. |
Páginas: |
257p. |
Idioma: |
Inglês |
Notas: |
Ph.D. Thesis. |
Conteúdo: |
The use of leguminous green manures can reduce the consumption of fossil fuel-intensive N fertilizer and/or increase crop yields where N fertilizer is not available. A method to screen legumes for their ability to supply N to succeeding crops is needed. Ideally, the method would also have application in estimating the N supplyng capacity of soils. A buried bag field incubation technique was proposed as a simple, labor-saving method to estimate N release from soil and green manure. A test of the buried bag technique and a fallow soil sampling procedure was conducted over two maize cropping seasons on a Typic Haplustox in central Brazil. Nine legume treatments containing from 70 to 305 KG N ha-1 and C/N from 15 to 24 were incorporated into the soil followed by either maize (Zea mays L.) or bare fallow. Low density polyethylene bags (0.1mm thick) were partly filled with soil from the plow layer at 42 and 237 days after incorporation and buried until harvest of the respective maize crops. Accumulation of N in the aboveground portion of maize was closely related to accumulation of nitrate in bare fallow plots to 180 cm depth (y=10+0.69x, r2=0.895) and to the sum of initial fallow profile N plus N accumulation in bags (y=34+0.48x, r2=0.924) over two crops. The buried bag technique involved much less labor than the fallow soil method. More reliable estimates of N release were obtained with buried bag incubation during the rainy season when nitrate leaching losses in the fallow plots were considerable. When the potential N mineralization rate as measured in fallow soil exceeded 1Kg ha-1 day-1, mineralization in the bags was reduced probably by restricted flow of O2 across the plastic. The bags were shown to limit mineralization in suplemenal experiments. Most previous authors did not report decreased N release in plastic bags but mineralization rates were lower than in this study. The total N applied as green manure explained 77% of the variability in aboveground N of the first maize crop after incorporation. The fraction of applied N which mineralized was related to C/N of the legume material (y=1.6-0.05x, r2=0.65). Maize grain dry matter was significantly correlated to aboveground N contet (r2=0.92). The buried bag technique should be considered as a method of estimating N release from soil and manure. MenosThe use of leguminous green manures can reduce the consumption of fossil fuel-intensive N fertilizer and/or increase crop yields where N fertilizer is not available. A method to screen legumes for their ability to supply N to succeeding crops is needed. Ideally, the method would also have application in estimating the N supplyng capacity of soils. A buried bag field incubation technique was proposed as a simple, labor-saving method to estimate N release from soil and green manure. A test of the buried bag technique and a fallow soil sampling procedure was conducted over two maize cropping seasons on a Typic Haplustox in central Brazil. Nine legume treatments containing from 70 to 305 KG N ha-1 and C/N from 15 to 24 were incorporated into the soil followed by either maize (Zea mays L.) or bare fallow. Low density polyethylene bags (0.1mm thick) were partly filled with soil from the plow layer at 42 and 237 days after incorporation and buried until harvest of the respective maize crops. Accumulation of N in the aboveground portion of maize was closely related to accumulation of nitrate in bare fallow plots to 180 cm depth (y=10+0.69x, r2=0.895) and to the sum of initial fallow profile N plus N accumulation in bags (y=34+0.48x, r2=0.924) over two crops. The buried bag technique involved much less labor than the fallow soil method. More reliable estimates of N release were obtained with buried bag incubation during the rainy season when nitrate leaching losses in the fallow plot... Mostrar Tudo |
Palavras-Chave: |
Maize; Saco plastico. |
Thesagro: |
Adubo Verde; Cerrado; Milho; Mineralização; Nitrogênio; Tecnologia; Zea Mays. |
Thesaurus Nal: |
green manures; mineralization; nitrogen; technology. |
Categoria do assunto: |
-- |
Marc: |
LEADER 03086nam a2200289 a 4500 001 1547762 005 1993-02-09 008 1989 bl uuuu m 00u1 u #d 100 1 $aCARSKY, R. J. 245 $aEstimating a vailability of nitrogen from green manure to subsequent maize crops using a buried bag technique. 260 $aCornell: Cornell University$c1989 300 $a257p. 500 $aPh.D. Thesis. 520 $aThe use of leguminous green manures can reduce the consumption of fossil fuel-intensive N fertilizer and/or increase crop yields where N fertilizer is not available. A method to screen legumes for their ability to supply N to succeeding crops is needed. Ideally, the method would also have application in estimating the N supplyng capacity of soils. A buried bag field incubation technique was proposed as a simple, labor-saving method to estimate N release from soil and green manure. A test of the buried bag technique and a fallow soil sampling procedure was conducted over two maize cropping seasons on a Typic Haplustox in central Brazil. Nine legume treatments containing from 70 to 305 KG N ha-1 and C/N from 15 to 24 were incorporated into the soil followed by either maize (Zea mays L.) or bare fallow. Low density polyethylene bags (0.1mm thick) were partly filled with soil from the plow layer at 42 and 237 days after incorporation and buried until harvest of the respective maize crops. Accumulation of N in the aboveground portion of maize was closely related to accumulation of nitrate in bare fallow plots to 180 cm depth (y=10+0.69x, r2=0.895) and to the sum of initial fallow profile N plus N accumulation in bags (y=34+0.48x, r2=0.924) over two crops. The buried bag technique involved much less labor than the fallow soil method. More reliable estimates of N release were obtained with buried bag incubation during the rainy season when nitrate leaching losses in the fallow plots were considerable. When the potential N mineralization rate as measured in fallow soil exceeded 1Kg ha-1 day-1, mineralization in the bags was reduced probably by restricted flow of O2 across the plastic. The bags were shown to limit mineralization in suplemenal experiments. Most previous authors did not report decreased N release in plastic bags but mineralization rates were lower than in this study. The total N applied as green manure explained 77% of the variability in aboveground N of the first maize crop after incorporation. The fraction of applied N which mineralized was related to C/N of the legume material (y=1.6-0.05x, r2=0.65). Maize grain dry matter was significantly correlated to aboveground N contet (r2=0.92). The buried bag technique should be considered as a method of estimating N release from soil and manure. 650 $agreen manures 650 $amineralization 650 $anitrogen 650 $atechnology 650 $aAdubo Verde 650 $aCerrado 650 $aMilho 650 $aMineralização 650 $aNitrogênio 650 $aTecnologia 650 $aZea Mays 653 $aMaize 653 $aSaco plastico
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
24/04/2006 |
Data da última atualização: |
17/02/2011 |
Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
Autoria: |
RODRIGUES, J. E. L. F.; ALVES, R. N. B.; TEIXEIRA, R. N. G.; ROSA, E. S. |
Afiliação: |
JOAO ELIAS LOPES F RODRIGUES, CPATU; RAIMUNDO NONATO BRABO ALVES, CPATU; RAIMUNDO NONATO GUIMARAES TEIXEIRA, CPATU; ELIAS SILVA ROSA, Extensionista EMATER-PA. |
Título: |
Adubação NPK, na cultura do feijão caupi em agricultura familiar, no município de Ponta de Pedras-PA. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
Belém, PA: Embrapa Amazônia Oriental, 2004. |
Páginas: |
4 p. |
Série: |
(Embrapa Amazônia Oriental. Comunicado técnico, 95). |
Idioma: |
Português |
Notas: |
Disponível também on-line. |
Conteúdo: |
O presente trabalho objetivou definir a dose mais econômica da fórmula comercial de adubação NPK (10-28-20), na cultura do feijão caupi, cultivar BR-3 Traquateua, com a participação efetiva dos pequenos agricultores familiares da comunidade de Jagarajó, envolvendo aproximadamente 40 famílias no Município de Ponta de Pedras. |
Palavras-Chave: |
Adubação NPK; Brasil; Caupi; Pará; Ponta de Pedras. |
Thesagro: |
Agricultura Familiar; Feijão de Corda. |
Thesaurus NAL: |
Amazonia. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/27539/1/com.tec.95.pdf
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Marc: |
LEADER 01153nam a2200277 a 4500 001 1402401 005 2011-02-17 008 2004 bl uuuu u0uu1 u #d 100 1 $aRODRIGUES, J. E. L. F. 245 $aAdubação NPK, na cultura do feijão caupi em agricultura familiar, no município de Ponta de Pedras-PA. 260 $aBelém, PA: Embrapa Amazônia Oriental$c2004 300 $a4 p. 490 $a(Embrapa Amazônia Oriental. Comunicado técnico, 95). 500 $aDisponível também on-line. 520 $aO presente trabalho objetivou definir a dose mais econômica da fórmula comercial de adubação NPK (10-28-20), na cultura do feijão caupi, cultivar BR-3 Traquateua, com a participação efetiva dos pequenos agricultores familiares da comunidade de Jagarajó, envolvendo aproximadamente 40 famílias no Município de Ponta de Pedras. 650 $aAmazonia 650 $aAgricultura Familiar 650 $aFeijão de Corda 653 $aAdubação NPK 653 $aBrasil 653 $aCaupi 653 $aPará 653 $aPonta de Pedras 700 1 $aALVES, R. N. B. 700 1 $aTEIXEIRA, R. N. G. 700 1 $aROSA, E. S.
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