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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
07/02/2020 |
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Data da última atualização: |
21/03/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MELGAR, R. J.; SMYTH, T. J.; SANCHEZ, P. A.; CRAVO, M. da S. |
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Afiliação: |
R. J. MELGAR; T. J. SMYTH; P. A. SANCHEZ; MANOEL DA SILVA CRAVO, CPAA. |
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Título: |
Fertilizer nitrogen movement in a Central Amazon Oxisol and Entisol cropped to corn. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
Fertilizer Research, v. 31, p. 241-252, 1992. |
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DOI: |
https://doi.org/10.1007/BF01063298 |
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Idioma: |
Inglês |
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Conteúdo: |
Nitrogen fertilization experiments were conducted on a Oxisol and Entisol in the Central Amazon to evaluate the influence of soil properties and rainfall distribution on soil inorganic N movement and N recovery by corn (Zea mays L.). One corn crop was grown during the wet season on each site. A second crop was planted in the Oxisol during the dry season. Inorganic N was monitored in urea-N treatments (0 to 160 kg ha -1) to a depth of 0.60 m by periodic soil sampling during each crop. During the wet season large N losses by leaching occurred in both soils with 120 or 160kgha -1 of applied N. Differences in soil permeability and corn rooting depth between soils contributed to a greater movement of N into subsoil layers in the Oxisol than the Entisol. However, N leaching beyond 0.60 m in the Oxisol was delayed, apparently because of NO 3 adsorption in the net positively charged subsoil layers. Corn yields and N recovery in the Entisol were higher than in the Oxisol, during the wet season. During the dry season N leaching in the Oxisol was greatly reduced, relative to the previous wet season, by split applications of fertilizer N and lower cumulative rainfall (300 vs. 1012 mm). Management practices which promote root growth into acid subsoil layers of the Oxisol would increase plant access to soil N, improve crop N recovery and reduce fertilizer N requirements. |
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Palavras-Chave: |
Soil inorganic nitrogen. |
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Categoria do assunto: |
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Marc: |
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001 2119992
005 2025-03-21
008 1992 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/BF01063298$2DOI
100 1 $aMELGAR, R. J.
245 $aFertilizer nitrogen movement in a Central Amazon Oxisol and Entisol cropped to corn.$h[electronic resource]
260 $c1992
520 $aNitrogen fertilization experiments were conducted on a Oxisol and Entisol in the Central Amazon to evaluate the influence of soil properties and rainfall distribution on soil inorganic N movement and N recovery by corn (Zea mays L.). One corn crop was grown during the wet season on each site. A second crop was planted in the Oxisol during the dry season. Inorganic N was monitored in urea-N treatments (0 to 160 kg ha -1) to a depth of 0.60 m by periodic soil sampling during each crop. During the wet season large N losses by leaching occurred in both soils with 120 or 160kgha -1 of applied N. Differences in soil permeability and corn rooting depth between soils contributed to a greater movement of N into subsoil layers in the Oxisol than the Entisol. However, N leaching beyond 0.60 m in the Oxisol was delayed, apparently because of NO 3 adsorption in the net positively charged subsoil layers. Corn yields and N recovery in the Entisol were higher than in the Oxisol, during the wet season. During the dry season N leaching in the Oxisol was greatly reduced, relative to the previous wet season, by split applications of fertilizer N and lower cumulative rainfall (300 vs. 1012 mm). Management practices which promote root growth into acid subsoil layers of the Oxisol would increase plant access to soil N, improve crop N recovery and reduce fertilizer N requirements.
653 $aSoil inorganic nitrogen
700 1 $aSMYTH, T. J.
700 1 $aSANCHEZ, P. A.
700 1 $aCRAVO, M. da S.
773 $tFertilizer Research$gv. 31, p. 241-252, 1992.
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Registro original: |
Embrapa Amazônia Ocidental (CPAA) |
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