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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
MOTAVALLI, P. P. |
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Título: |
The effects of inorganic and organic soil amendments on sulfur availability to maize in an oxisol of Brazil. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
[S.l.): Cornell University, 1989. |
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Páginas: |
281p. |
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Idioma: |
Inglês |
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Notas: |
Dissertation of Doctor. |
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Conteúdo: |
The principal objective of this research was to determine the impact of incorporating organic materials as well as lime, gypsum and P fertilizer on sulfur availability to maize (Zea mays) in a highly-weathered, acid soil of the Cerrado (Savanna) Region of Brazil. Sulfate absorption in the soil was reduced by incorporating lime or plant materials to a Dark-Red Latosol (Typic Haplustox). The effect plant materials on reducing sulfate absorption and KCL-extractable A1 and increasing negative surface charge and pH was dependent on the type and quantity of material applied. The incorporation of a high rate of feijao de porco (Canavalia Ensiformis L.) tissue resulted in a greater reduction in sulfate adsorption, but was of shorter duration than incorporation of guinea grass (Panicum Maximun Jacq.) These differences were attributed to the faster rate of decomposition of the feijao de porco tissue with its lower C:N and C:S rations. Sulfate leaching was promoted by additions of lime in combination with gypsum to a depth of 30-45cm after three growing seasons of a field experiment. Soil samplings from long-term experiments demostrated that P fertilizer additions enhanced sulfate movement when soil pH was greater than 5.0 Incorporation of plant materials did not result in a detectable increase in sulfate leaching, but increases in sulfur mineralization were observed, especially with addition of lime. Maize silage dry matter ha-1 yr-1 ranged from 1.3 to 3.5 t ha-1, primarily due to a K response. An S response was observed in the third growing season. Sulfate leaching and accumulation of sulfate in the subsoil resulted in early season S deficiency in untreated soil. Management practices which concentrate added organic materials near the plant and which add sufficient quantities of sulfur may be beneficial for improving S availlability in unlimed, acid soils. MenosThe principal objective of this research was to determine the impact of incorporating organic materials as well as lime, gypsum and P fertilizer on sulfur availability to maize (Zea mays) in a highly-weathered, acid soil of the Cerrado (Savanna) Region of Brazil. Sulfate absorption in the soil was reduced by incorporating lime or plant materials to a Dark-Red Latosol (Typic Haplustox). The effect plant materials on reducing sulfate absorption and KCL-extractable A1 and increasing negative surface charge and pH was dependent on the type and quantity of material applied. The incorporation of a high rate of feijao de porco (Canavalia Ensiformis L.) tissue resulted in a greater reduction in sulfate adsorption, but was of shorter duration than incorporation of guinea grass (Panicum Maximun Jacq.) These differences were attributed to the faster rate of decomposition of the feijao de porco tissue with its lower C:N and C:S rations. Sulfate leaching was promoted by additions of lime in combination with gypsum to a depth of 30-45cm after three growing seasons of a field experiment. Soil samplings from long-term experiments demostrated that P fertilizer additions enhanced sulfate movement when soil pH was greater than 5.0 Incorporation of plant materials did not result in a detectable increase in sulfate leaching, but increases in sulfur mineralization were observed, especially with addition of lime. Maize silage dry matter ha-1 yr-1 ranged from 1.3 to 3.5 t ha-1, primarily due to a K... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02286nam a2200133 a 4500
001 1336435
005 2002-11-22
008 1989 bl uuuu m 00u1 u #d
100 1 $aMOTAVALLI, P. P.
245 $aThe effects of inorganic and organic soil amendments on sulfur availability to maize in an oxisol of Brazil.
260 $a[S.l.): Cornell University$c1989
300 $a281p.
500 $aDissertation of Doctor.
520 $aThe principal objective of this research was to determine the impact of incorporating organic materials as well as lime, gypsum and P fertilizer on sulfur availability to maize (Zea mays) in a highly-weathered, acid soil of the Cerrado (Savanna) Region of Brazil. Sulfate absorption in the soil was reduced by incorporating lime or plant materials to a Dark-Red Latosol (Typic Haplustox). The effect plant materials on reducing sulfate absorption and KCL-extractable A1 and increasing negative surface charge and pH was dependent on the type and quantity of material applied. The incorporation of a high rate of feijao de porco (Canavalia Ensiformis L.) tissue resulted in a greater reduction in sulfate adsorption, but was of shorter duration than incorporation of guinea grass (Panicum Maximun Jacq.) These differences were attributed to the faster rate of decomposition of the feijao de porco tissue with its lower C:N and C:S rations. Sulfate leaching was promoted by additions of lime in combination with gypsum to a depth of 30-45cm after three growing seasons of a field experiment. Soil samplings from long-term experiments demostrated that P fertilizer additions enhanced sulfate movement when soil pH was greater than 5.0 Incorporation of plant materials did not result in a detectable increase in sulfate leaching, but increases in sulfur mineralization were observed, especially with addition of lime. Maize silage dry matter ha-1 yr-1 ranged from 1.3 to 3.5 t ha-1, primarily due to a K response. An S response was observed in the third growing season. Sulfate leaching and accumulation of sulfate in the subsoil resulted in early season S deficiency in untreated soil. Management practices which concentrate added organic materials near the plant and which add sufficient quantities of sulfur may be beneficial for improving S availlability in unlimed, acid soils.
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