科研之友
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摘要
An understanding of soil K dynamics is important for K management in a rice-mustard cropping pattern. Ten rice soils were evaluated for labile K (Delta K-0), K intensity (AR(e)(K)), change of K in solution (Delta K), equilibrium exchangeable K (EK0), magnitude of conversion of solution K to exchangeable K (alpha) and potential buffering capacity of K (PBCK). The 10 soils had exchangeable K values of 0.12-0.44 cmol(c) kg(-1), with the lowest value in Telbal loam and the highest in Badripora clay loam. The highest Delta K-0 value (-0.356 cmol(c) kg(-1)) was observed in Badripora clay loam, and the lowest (-0.239 cmol(c) kg(-1)) was found in Kreeri clay loam. These soils exhibited equilibrium AR(Ke) values of 0.8 to 3.1 x 10(-3) mM(1/2), with the lowest value in Bonbagh clay loam and the highest in Ganasthan silt loam. The highest EK0 value (0.853 cmol(c) kg(-1)) was observed in Kharpora clay loam and lowest (0.0.507 cmol(c) kg(-1)) was in Bonbagh clay loam. These soils also differed in the magnitude of conversion of solution K to exchangeable K(alpha), the highest value (32%) being seen in Ganasthan silt loam and the lowest (15%) in Dialgam loam. PBCK ranged from 13.79 to 49.91 cmol(c) kg(-1)/mM(1/2). Future research is needed to calibrate the characteristics of K dynamics for soil fertility management and to predict how long a nonresponsive soil can meet crop K demand in rice-mustard and rice-wheat cropping systems.
- 出版日期2013
