Effect of N and K fertilizer application on the yield and nutrient dynamic changes in maize

In order to provide scientific base of fertilization for maize,the method combining field trial and soil and plants' diagnosis was applied to study the effects of N and K fertilizer application on its yield and nutrient dynamic changes.The results indicated that: on the fields with high P level,without P fertilizer applied and combining N with K fertilizer could increase maize yield by 1.8%～12.4%,spike length,1.8%～8.2%,spike diameter,1.3%～4.1%,grain number,11.3%～22.5%,hundred-seed weight,1.1%～4.8%.Through the synthesis analysis of the field,spike characters and leaves nutrient content of N,P and K in maize,the treatment of N2K2 was the best and its maize yield was at 11 183.3 kg/hm2 while soil P content was at 35.3 mg/kg.