Effects of different soil types and rainfall on soybean yield and potassium fertilizer efficiency in Jilin province

The field experiment data of 166 soybeans were analyzed for 6 years in 2005-2010，the results showed that soil type and climate conditions had obvious effects on soybean yield and potassium fertilizer efficiency in Jilin province. On Alluvial soil，soybean yield and potassium fertilizer efficiency were significantly higher than those on Albic soil and on dark brown forest soil. The change of annual rainfall in Jilin province significantly affected the soybean yield. Drought and flood decreased soybean yield and potassium fertilizer efficiency seriously，especially in flooding years. Different ecological zones due to the sunshine，temperature and other meteorological factors had obvious effects on soybean yield，that in middle planting zone was higher than that in east planting zone，however，the effect of potassium fertilizer in east plant zone was significant and yield increasing was remarkable. Therefore，we should adjust slight potassium fertilizer rate according to the soil type and climate to increase soybean yield and use efficiency of potassium.