Establishment and Analysis of Model of Effect Function of N,P and K Fertilizer in Maize

The test results of establishment and analysis of the model of the effect function of N,P and K fertilizer in maize showed that,the middle-level sand bottom ash of medium fertility was suitable for planting corn,the effect of nitrogen fertilizer on yield was the largest and the second was the potassium fertilizer,the lowest was the phosphorus fertilizer,corn yield and nitrogen,phosphorus,potassium application amount could be highly synthesized undeter mined quadratic equation,and the synergistic effect of nitrogen,phosphorus and potassium was obvious.Through the comprehensive analysis,the target output was 11 000~13 000 kg/hm2,the recommended fertilizer amount was pure N 240~300 kg/hm2,P2O5 of 75~90 kg/hm2,K2 O of75~90 kg/hm2.