Soil Components Affecting Phosphate Sorption Parameters of Acid Paddy Soils in Guangdong ProvinceEnglish Full Text

LI HUAXING, ZHANG XINMING and LIU YUANJIN (College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 China)

Abstract: Soil components affecting phosphate sorption parameters were studied using acid paddy soils derived from basalt, granite, sand-shale and the Pearl River Delta sediments, respectively, in Guangdong Province. For each soil, seven 2.50 g subsamples were equilibrated with 50 mL 0.02 mol L-1 （pH=7.0） of KCI containing 0, 5, 10, 15, 25, 50 and 100 mg P kg-1, respectively, in order to derive P sorption parameters （P sorption maximum, P sorption intensity factor and maximum buffer capacity） by Langmuir isotherm equation. It was shown that the main soil components influencing phosphate sorption maximum （Xm） included soil clay, PH, amorphous iron oxide （Feo） and amorphous aluminum oxide （Alo）, with their effects in the order of Alo ＞ Feo ＞ pH ＞ clay. Among these components, pH had a negative effect, and the others had a positive effect. Organic matter （OM） was the only soil component influencing P sorption intensity factor （K）. The main components influencing maximum phosphate buffer capacity （MBC） consisted of soil clay, OM,pH, Feo and Alo, with their effects in the order of Alo ＞ OM ＞ pH ＞ Feo ＞ clay. Path analysis indicated that among the components with positive effects on maximum phosphate buffer capacity （MBC）, the effect was in the order of Alo ＞ Feo ＞ Clay, while among the components with negative effects, OM ＞ pH. OM played an important role in mobilizing phosphate in acid paddy soils mainly through decreasing the sorption immensity of phosphate by soil particles.

Keywords：

Guangdong Province; phosphate sorption parameters; soil components;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

Soil Components Affecting Phosphate Sorption Parameters of Acid Paddy Soils in Guangdong ProvinceEnglish Full Text

LI HUAXING, ZHANG XINMING and LIU YUANJIN (College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 China)

Read on your phone instantly

Citation Network

Related Literature