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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。
In this paper, the general chemistry leaching method, potting exhaustion test and constant humidity culture experiment were used to study the regularity of potassium fixation and release in several different soils. The results showed that under constant humidity conditions, the potassium fixing ability of different soils varied greatly. The absolute amount of fixed potassium increased with the increase of potassium supply. After six consecutive ryegrass harvests, soil exchangeable potassium was reduced to its lowest value and then no longer declined, with the lowest value varying from soil to soil. It shows the soil potassium release rate of potassium in the solution, ie, soil potassium, during crop growth. It also shows that the release of interlayer potassium (non-exchangeable potassium) plays an important role in crop potassium supply.