KINETICS OF SOIL PHOSPHATE DESORPTION AS AFFECTED BY CITRIC-ACID

被引：52

作者：

GERKE, J

机构：

[1] Institut für Agrikulturchemie, Universität Göttingen, Göttingen, D-37075

来源：

ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE | 1994年 / 157卷 / 01期

关键词：

D O I：

10.1002/jpln.19941570104

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Citrate can accumulate in the rhizosphere of phosphate (P) deficient plants. Therefore, P desorption was investigated in relation to citrate concentrations applied in a single or sequential mode to a Luvisol and a Podzol. Cumulative P desorption increased up to 20 times that of the control, the absolute increase being higher in the Podzol. The rate of P release was closely related to the rate of Fe+Al release indicating that desorption originated mainly from Fe/Al associated P. The mode of citrate loading affected the P desorption in an ambiguous manner. P-diffusion coefficients were calculated from the desorption data. The coefficients strongly increased with citrate loading, the increase being more pronounced in the Podzol.

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页码：17 / 22

页数：6

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