Factors affecting phosphate fixation in soils of the state of São Paulo

Author:

Rodrigues M.R.S.1,Mello F.A.F.1

Affiliation:

1. USP

Abstract

A laboratory experiment was carried out to study the effects of chemical and physical characteristics of the soil on the phosphate fixing capacity. One hundred samples collected from various localities were at first characterized chemically and their particlesize distribution determined. They were then tested as to their phosphate fixing capacities. The results obtained were statistically analysed by means of both simple linear and multiple correlation. The following conclusions could be drawn: 1. simple linear regression analysis indicated that % C, exchangeable Al+3, CEC, % clay, pH and % sand were the soil characteristics which significantly affected phosphate fixing capacity of São Paulo State soils; 2. multiple linear regression analysis indicated that % C, exchangeable Mg(+2)9 exchangeable- Al+3 and % clay were the soil characteristics which significantly affected the phosphate fixing capacity of São Paulo State soils; 3. the phosphate phonomena fixing as they occur in the soils of the São Paulo State can be best described by the following equation: Y = -2,266 - 3,484 + 3,514 + 5,559 + 1,005 %C Mg+2 Al+3 % clay exchangeable exchangeable 4. phosphate fixation in the soil is affected by the combined effects of both soil chemical and physical characteristics.

Publisher

FapUNIFESP (SciELO)

Reference25 articles.

1. Phosphorus retention capacities of some cacaogrowing soils in Ghana and their relationships with soil properties;AHENKORAH U.;Soil Science

2. The trend of phosphate adsorption by inorganic coloids from certain Indiana soils;ALLISON L.E.;Soil Science

3. Fixação de fósforo nos solos brasileiros;ANASTÁCIO N.L.A.;Boletim Técnico da Equipe de Pedologia e Fértilidade do Solo

4. The effect of exchangeable calcium on the retention of phosphorus by clay fractions of soils of the Memphis Catena;CALVERT D.V.;Proc. Soil Sci.. Soc. Am.

5. Avaliação da capacidade de fixação de fósforo pelo solo;CATANI R.A.;An. Esc. Sup. Agric. "Luiz de Queiroz"

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