Ability of black soil supplying potassium and effect of potassic fertilizer on soybean
نویسندگان
چکیده
The black land is distributed in a narrow area from south to north in northeast of China Nine soil samples with high, middle and low fertility were collected in the field of south, north and middle area. These samples were analyzed in laboratory, and pot experiment was performed mainly in Harbin. The results showed that Black soil has high potential of providing potassium, the concentration of available potassium in the soil was 121~212 mg kg in different fertility soils and different place; the slowly available potassium was 656-1256 mg kg, all of which are of middle or high level. The content of potassium is sufficient for soybean growth under normal production conditions and there no effect on increasing yield. Under drought condition, the potassium increased yield by 15.6%. Under the condition of serious plant diseases and insect pests, the potassium increased the yield by 10.5%-22.6% under soybean following other crops and by 11.6%-23.8% under continuous cropping. Increasing the N and P application singly for high yield, there would be no increasing effect in yield. But if the N, P and K were increased at the same time, the yield would be increased by 8.6%.
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تاریخ انتشار 2002