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采用盆栽试验,在黄棕壤,砖红壤,黑土三种土壤上种植烟草,研究了外源钾对土壤中钾转化的影响,结果表明:在黄棕壤,黑土上,0.0-0.8 g kg-1施肥范围内,随着施钾量的增加,土壤中速效钾和缓效钾的总增量、作物的含钾量均在增加,尤其是在0.8 g kg-1施肥水平时,二者超出了施肥的增加量,说明施钾促进了其它钾的释放;三种土壤中粘土矿物含量为:黑土>黄棕壤>砖红壤。
Pot experiments were carried out to study the effects of exogenous potassium on the conversion of potassium in yellow-brown soil, brick-red soil and black soil. The results showed that on the yellow brown soil and the black soil, 0.0-0.8 g kg- 1 Within the fertilization range, with the increase of potassium application, the total available potassium and slow-acting potassium in soil increased, and the potassium content in the crop increased, especially at the rate of 0.8 g kg-1 The amount of fertilization increased, indicating that potassium application promoted the release of other potassium. The contents of clay minerals in three soils were: black soil> yellow brown soil> red soil.