POTASSIUM FIXATION IN SOME KENYAN SOILS

被引:18
作者
BARBER, RG
机构
[1] Department of Soil Science, University of Nairobi, Nairobi
来源
JOURNAL OF SOIL SCIENCE | 1979年 / 30卷 / 04期
关键词
D O I
10.1111/j.1365-2389.1979.tb01027.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Potassium fixation was measured for 13 Kenyan soils with a range of applied potassium (0 to 1000 mg kg−1). The fixed potassium was measured, and hence is defined in this study, by the difference between the amount of applied K and the increase in the extractable K after equilibration, using a single ‘equilibrium’ extraction procedure with 0. 25 M Cad, as the extractant. At application rates of 50 and 1000 mg kg−1 the fixed potassium varied from −52% to 64% and 7% to 39% respectively. A correlation was found between the K fixation and % clay content at the 1000 mg kg1 application rate. Estimates of the % fixation by the clay fractions gave 53 to 80% for montmorillonites, 48 to 66% for amorphous clays and 19 to 32% for kaolinites. It is suggested that the amorphous clays may fix potassium by a ‘sieve’ mechanism. Copyright © 1979, Wiley Blackwell. All rights reserved
引用
收藏
页码:785 / 792
页数:8
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