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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。
Some potential potassium supply potentials of cultivated brown earth in seven main soil parent materials were studied in Liaoning Province. The contents of total potassium, available potassium, slow-acting potassium and easily-released non-exchangeable potassium were 0.69% -2.18% 85.0-247.5ppm, 177.5-1227.5ppm and 237.5-1752.5ppm; soil potassium buffer capacity of 77.65-214.68me / (mol / L) ~ (1/2) · 100 grams of soil. Soil response to potash is affected not only by available potassium, slow-acting potassium and easy-to-release non-exchangeable potassium, but also by soil potassium buffering capacity. Bio-depletion test results are closely related to soil potassium supply, which can reflect the potassium status of soil. Except for the potential for potassium supply of marl and granite residual parent brown soil, the development of brown soil of other parent materials appears to be deficient in potassium supply to some extent and the problem of basal residual metal brown soil is particularly serious.