外源钾对三种不同土壤钾转化影响的研究

Effect of Potassium Application on Transformation of Soil Potassium in Different Soils

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。

To study the effect of potassium fertilizer on transformation of soil potassium in yellow - brown soil, lateritic red soil and black soil after planting tobacco and wheat, pot culture experiment was carried out. The results showed that:the total quantity of available potassium and slowly available potassium K content in leaves were increased when the applied K was increased from 0 to 0.8 g kg-1 and they both exceeded the increased quantity of supplied fertilizer. The finding showed applied potassium promoted the release of other potassium.