There was great difference on yield increase amounts to maize for potash fertilizer on different type of soil and it increased yield by 15.1% on the black soil, 20.4% on the light chernozem soil and 38.8% on the aeolian sandy soil.

• 钾肥在不同类型土壤上对玉米增产数量有较大差异；在黑土上增产15.；1%25；淡黑钙土上增产20