Phosphate Adsorption and Surface Charge Characteristics and Their Relations to Mineralogy of Some Soils from Southern ChinaEnglish Full Text

ZHANG MINGKUI; M. J. WILSON; HE ZHENLI; L. CLARK and D. M. L. DUTHIE (Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hanyzhou 310029 China) (Soils and Soil Microbiolopy Division, Macaulay Land Use Research Institu

Abstract: The phosphate adsorption and surface charge characteristics of the tropical and subtropical soils derived from different parent materials in China were determined, and their relations to soil mineralogy were analysed.The results showed that all soil phosphate adsorption curves were well fitted by Freundlich equation and Langmuir equation. The maximum buffering capacity of P ranged from 66 to 9880 mg kg-1, with an increasing order of purple soil, skeletal soil, red soil, lateritic red soil, yellow soil and latosol; and the highest value was 149 times the lowest value, which indicated great differences among these soils in phosphate adsorption and supplying characteristics. The pHo （zero point of charge） values obtained by salt titrationpotential titration varied from 3.03 to 5.49, and the highest value was found in the latosol derived from basalt whereas the lowest value was found in the purple soil. The correlation analysis indicated that the main minerals responsible for phosphate adsorption in the soils were gibbsite, amorphous iron oxide and kaolinite; and the pHo was mainly controlled by kaolinite, gibbsite and oxides.

Keywords：

mineralogy; pH₀; phosphate adsorption; tropical and subtropical soils;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S152

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Phosphate Adsorption and Surface Charge Characteristics and Their Relations to Mineralogy of Some Soils from Southern ChinaEnglish Full Text

ZHANG MINGKUI; M. J. WILSON; HE ZHENLI; L. CLARK and D. M. L. DUTHIE (Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hanyzhou 310029 China) (Soils and Soil Microbiolopy Division, Macaulay Land Use Research Institu

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