Studies on the Optimum Potash Fertilizer Rate for Super-rice on the Alluvial Soil

Results of field experiment showed that on the alluvial soils of Jilin Province,potash fertilizer applications could have a obvious yield-increasing effect on rice,and the optimum potash fertilizer rate was K2O75 kg/ha,whose relative yield-increasing value was 7.34%,and the fertilizer utilization rate reached 53.6%,1 000-grains weights and grain number per spike was the highest.