Data/hora: 11/06/2024 16:03:25

Biblioteca(s): | Embrapa Agrobiologia; Embrapa Gado de Corte.
Data corrente: | 12/08/1997
Data da última atualização: | 15/01/2014
Autoria: | SOUZA, O. C.
Título: | Sulfur oxidation influence on rock phosphate solubilization in soil.
Ano de publicação: | 1985
Fonte/Imprenta: | [S.l.]: Texas A&M University, 1985.
Páginas: | 43p.
Idioma: | Inglês
Notas: | Tese Mestrado.
Conteúdo: | The low solubility of many rock phosphate (RP) around the world is the main cause of their ineffectiveness when applied to soil as a source of P for crops. The low solubility decreases their value as P fertilizers and prevents their widespread use, especially for high P demanding crops. One method proposed to enhance RP solubility is to add sulfur (S) as an amendment. The oxidation of S to H2SO4 in the soil results in dissolution of the applied RP. This study tested three Brazilian RP sources (Araxa, Catalao, and Patos de Minas) mixed with S at a ratio of 5:1 (RP:S). The application of the RP-S mixtures proved to be a promising alternative method for increasing RP solubility and thus their effectiveness as P sources. The soil pH decreased proportionally to increasing rates of RP-S application. The NaHCO3 extractable soil P increased as a consequence of increased soil acidefication. The ryegrass growth, P uptake, plant P concentration and P recovered from RP sources were enhanced only when S was mixed with the RPs. On the other hand, when RP sources were applied directly without S, the available soil P as measured by NaHCO3 extraction was depleted with time regardless of source or rate of RP. The inefficiency of the directly applied RP sources to supply adequate P was evidenced by less plant growth than applied with S. Also, in addition to this inadequate supply of for plant assimilation, the directly applied RP sources failed to develop a residual reserve of available P in the soil, even at very high application...
Palavras-Chave: | P; S.
Thesagro: | Enxofre; Fósforo; Oxidação; Solo; Solubilidade.
Thesaurus Nal: | oxidation; phosphorus; soil; solubility; sulfur.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)

Exemplares:

CNPGC - (7928-1) - ADD - TS - PP - T486/85 - SOU - T486/85 - DIS
CNPAB - (25003-1) - ADD - TS - -- - 546.712 - S729s - 1986.00044 - DIS