Potassium release rates from ustisols and their application

文献类型： 外文期刊

第一作者： Lu, XN

作者： Lu, XN;Zhang, MH;Xu, JM

作者机构：

关键词： Corn;K release rate;Kinetics;Soil k-supplying power;Nonexchangeable potassium;Sodium tetraphenylboron;Kinetics;Soils

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Second-order equations were used to characterize the potassium release rate for 20 low-hilly ustisols derived from Quaternary red clay in Zhejiang province, China. This was done under the condition of electric field strength of 44.4 and 88.8 V cm(-1). The values of the initial K release rate (v(0)) ranged from 1.17 to 21.23 and from 1.93 to 61.58, with an average of 5.36 and 9.54 mg kg(-1) min(-1) under the electric field strength of 44.4 and 88.8 V cm(-1), respectively. Six indices, including the relative grain yield, relative total dry matter yield and K uptake in NP treatments of 20 corn field experiments and available K, HNO3 soluble K and slowly available K of soils were used to assess the practical applicability of K release rates. The correlation analysis showed that v(0) was very significantly correlated ( P = 0.01) with the above six indices, and their correlation coefficients were 0.6275**, 0.5645**, 0.6624**, 0.7277**, 0.7843** and 0.6299**, respectively, under the electric strength of 44.4 V cm(-1). The v(0) was related to relative total dry matter yield ( P = 0.05, r = 0.5445*) and very significantly correlated to the other five indices ( relative grain yield, K uptake in NP treatment, available K, HNO3 soluble K and slowly available K), with the correlation coefficients of 0.6064**, 0.7216**, 0.7523**, 0.8202** and 0.6686**, respectively, under the electric strength of 88.8 V cm(-1). From the results, we conclude that v(0) can be used to estimate the supplying power of soil K to annual crops such as corn, and to characterize soil K fertility.

分类号： Q948

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