【摘要】 本文用一般化学浸提法、盆栽耗竭试验和恒湿培养试验,研究了几种不同土壤中钾的固定与释放规律。结果表明,在恒湿条件下不同土壤固钾能力相差很大,固定钾的绝对量随施钾量的增加而增加。黑麦草连续收割6次后,土壤交换性钾降到最低值,尔后不再下降,该最低值因土壤不同而异。它表示了在作物生长过程中土壤对溶液中钾的缓冲能力的即土壤钾的释放速率。同时也说明了层间钾(非交换性钾)的释放对作物钾素供应起了重要作用。更多还原

【Abstract】 This study dealt with the fixation and release of K from some different soils by using conventional chemical extraction methods, pot exhaustion and incubation experiments. Under the constant moisture incubation, the ability of fixing potassium varied with soils to a considerable extent and the absolute content of fixed K increased with the adding of potassium applied. After six successive cropping of rye in the greenhouse, the exchangeable K in soils reduced to a minimum value which then did not decrease any more. This minimum value differed with the soils and was considered as a representation of soil buffer capacity to K in the solution during the growth period and as a release rate of soil K.Results also showed that the release of interlayer K (non-exchangeable K)played an important role in potassium supply to the plants.更多还原