Studies on the Effect of Balanced Fertilization to Spring Maize

Field experiment showed that balanced fertilization not only increased maize yield but also promoted nutrient uptake,N,P,K uptake per 100 kg grain was 1.56 kg,0.25 kg and 0.73 kg respectively,and proportion of NPK uptake was 1-0.16-0.47 under OPT level.NPK absorption peak stage was at jointing stage to belling stage.N was the first limiting factor for high yielding maize under the experiment conditions of soil fertility.Secondary and micro-nutrients was not the limiting factor for maize yield.