Evaluation of differences in potassium availability in soils of the same exchangeable potassium level
作者:
J.K. Shaw,
R.K. Stivers,
S.A. Barber,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1983)
卷期:
Volume 14,
issue 11
页码: 1035-1049
ISSN:0010-3624
年代: 1983
DOI:10.1080/00103628309367430
出版商: Taylor & Francis Group
关键词: Potassium;Diffusion;Exchangeable;Soluble;Root;Model
数据来源: Taylor
摘要:
Potassium availability was determined by growing corn (Zea maysL.) in pots of soil in a controlled environment chamber. Comparison of K uptake rate per unit root area indicated differing degrees of K availability. The differences in availability among soils were not predicted by differences in cation exchange capacities. The K concentration in solution and the average rate of diffusion more nearly reflected differences in K availability, particularly when the kinetic rate factors of diffusion and mass flow were integrated with root growth and uptake factors in the Cushman mathematical model of K uptake. Utilization of this model demonstrated the importance of using rate factors for ion movement in soil along with plant factors of root growth in predicting K availability.
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