辽宁省耕地棕壤供钾潜力的研究

 研究了辽宁省七种主要成土母质发育的耕地棕壤一些供钾潜力指标：土壤全钾含量、速效钾含量、缓效钾含量和易释放非交换性钾含量分别为0.69%-2.18%、85.0-247.5ppm、177.5-1227.5ppm和237.5-1752.5ppm；土壤钾缓冲容量77.65-214.68me/(mol/L)#+(1/2)·100克土。土壤对钾肥的反应不仅受土壤速效钾、缓效钾和易释放非交换性钾的制约，还受土壤钾缓冲容量的影响。生物耗竭试验结果与土壤供钾指标相关密切，可以反映土壤的供钾状况。除泥灰岩和花岗岩残积母质棕壤供钾潜力较大外，其它母质发育的棕壤不同程度地出现供钾不足，玄武岩残积母质棕壤问题尤重。

A STUDY ON THE POTASSIUM SUPPLY POTENTIAL OF THE CULTIVATED BROWN EARTH IN LIAONING PROVINCE

The total K contents of the cultivated Brown earth in Liaoning Province range from 0.69% to 2.18%. The amount of rapidly available K, slowly available K and easily release non-exchangeable K are 85.5-24.7.5ppm, 177.5-1227.5ppm and 237.5-1752.5ppm, respectively. Potential buffering capacity of the soil for potassium (PBC~K) values ranging from 77.65 to 214.68 me/10Og soil/(mol/L). The PBC~K values are positively correlated with the content of the clay (r=0.926, n=8). The results of the pot experiments indicate that the response of young wheat yields to potassium fertilizer is negatively correlated with the amount of rapidly available K (r=-0.736,n=8) and PBC~k values (r=-0.743, n=8). The PBC~K values, slowly avilable K and easily release non-exchangeable K are better indexes for estimating the K.supply potential of soil developed in different parent materials, The potassium supply potential of the cultivated Brown soils in Liaoning Province is Brown earth developed on clay marl residual deposit, Brown earth developed on granite residual deposit, Brown earth developed on loess-like sediment, Brown earth developed on shale residual deposit, Brown earth developed on sandstone residual deposit, Brown earth developed on quaternary red clay, Brown earth developed on basalt residual deposit.