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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Gado de Leite. |
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Data corrente: |
31/08/1992 |
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Data da última atualização: |
04/09/2002 |
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Autoria: |
YOST, R. S. |
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Título: |
Effect of rate and placement on availability and residual value of P in an Oxisol of Central Brazil. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Raleigh: North Carolina State University, 1977. |
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Páginas: |
160 p. |
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Idioma: |
Inglês |
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Notas: |
Tese Doutorado. |
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Conteúdo: |
The effects of P rate and placent on the yield of corn were studied on na Oxisol in Central Brazil. Residual effects of P applications were measured by corn growth and soil analyses. With five crops of corn grow in two and-half years about 20% of the applied P was utilized in grain and stover where grain yield appeared to be a maximum ( assuming no contribution from soil). Maximum yields of corn grain were obtained wich na initial broadscast application of 560 Kg P/há which gave a soil solution concentration of obout 0.05 ug P/ml as measured by sorption curves. The highest combination of yield and utilization occurred with an inicial broadcast application of 140 Kg P/Há and consecutive band aplications of 35 Kg P/há. The band application of P provided for rapid initial growth and also provided effective residual effects due to localized zones of high P concentration. Both double acid and .5N NaHCO3 methods of extracting soil P provided reliable estimates of critical levels, 10-15, 6-10 ug P/g, respectively, which were similar to values obtained min other areas in Brazil. Basing P requirements on field calibration of these soil test extractants should provide for 80 to 85% maximum yields using only one half the amounts of fertilizer P as that estimated by the requirement for maximum yield based on amounts of adsorbed P required to provide . 05 ug P/ml in the soil solution.
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Palavras-Chave: |
Brasil; Central region; Regiao Central; Solos. |
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Thesagro: |
Cerrado; Fósforo; Oxisol. |
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Thesaurus Nal: |
Brazil; Ferralsols; phosphorus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02059nam a2200253 a 4500
001 1565257
005 2002-09-04
008 1977 bl uuuu m 00u1 u #d
100 1 $aYOST, R. S.
245 $aEffect of rate and placement on availability and residual value of P in an Oxisol of Central Brazil.
260 $aRaleigh: North Carolina State University$c1977
300 $a160 p.
500 $aTese Doutorado.
520 $aThe effects of P rate and placent on the yield of corn were studied on na Oxisol in Central Brazil. Residual effects of P applications were measured by corn growth and soil analyses. With five crops of corn grow in two and-half years about 20% of the applied P was utilized in grain and stover where grain yield appeared to be a maximum ( assuming no contribution from soil). Maximum yields of corn grain were obtained wich na initial broadscast application of 560 Kg P/há which gave a soil solution concentration of obout 0.05 ug P/ml as measured by sorption curves. The highest combination of yield and utilization occurred with an inicial broadcast application of 140 Kg P/Há and consecutive band aplications of 35 Kg P/há. The band application of P provided for rapid initial growth and also provided effective residual effects due to localized zones of high P concentration. Both double acid and .5N NaHCO3 methods of extracting soil P provided reliable estimates of critical levels, 10-15, 6-10 ug P/g, respectively, which were similar to values obtained min other areas in Brazil. Basing P requirements on field calibration of these soil test extractants should provide for 80 to 85% maximum yields using only one half the amounts of fertilizer P as that estimated by the requirement for maximum yield based on amounts of adsorbed P required to provide . 05 ug P/ml in the soil solution. .
650 $aBrazil
650 $aFerralsols
650 $aphosphorus
650 $aCerrado
650 $aFósforo
650 $aOxisol
653 $aBrasil
653 $aCentral region
653 $aRegiao Central
653 $aSolos
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 3 | |
| 2. |  | RITCHEY, K. D.; COX, F. R.; GALRAO, E. Z.; YOST, R. S. Disponibilidade de zinco para as culturas do milho, sorgo e soja em Latossolo Vermelho-Escuro argiloso. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.3, p.215-225, mar. 1986.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 3. | | RITCHEY, K. D.; COX, F. R.; GALRAO, E. Z.; YOST, R. S. Disponibilidade de zinco para as culturas do milho, sorgo e soja em latossolo vermelho-escuro argiloso. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.3, p.215-225, 1986.| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 3 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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