Effects of Potassium Fertilizer Used in Different Periods with Different Amount on Danda17 Maize Quality

With Danda17,the commonly cultivated maize variety in Dandong district,as material,the effect of application amount and method of potassium fertilizer on maize quality was researched by quadratic regression rotation composite design.The results showed that the perfect application amount of potassium sulfate was 183.33-211.00 kg/ha as base fertilizer and 32.75-65.76 kg/ha as additional fertilizer.Under the application mode,the protein content in maize grain increased by 0.99%,the fatty content increased by 0.50%,and the starch content increased by 5.06%.Potassium fertilizer used as base fertilizer in sowing period and additional fertilizer in big trumpet period could improve maize quality obviously,and all the quality indexes reached the best.