Studies on Soil Nutrient Restrictive Factor for High-yielding Summer Maize

Field experiment was conducted to study the effects of nine kinds of element fertilizers on summer maize yield,soil nutrient content,N,P and K nutrient accumulation and their efficiency.The results showed that the combined application of different element fertilizers could increase maize yield significantly,and the increase rate was 7.0%~19.2%,nitrogen fertilizer enabled yield to increase 12.4%,phosphate fertilizer did 5.0%,and the others did-1.9%~4.8%.Application of nitrogen,phosphorus and potassium could significantly improve the content of soil available nutrient and nutrient accumulation in plants,the available N,P,K content in the soil increased respectively by 13.60,6.80 and 20.40 mg/L,and the N,P,K accumulation in maize plants increased by 19.18%,7.99% and 13.68% respectively.The quarter nutrients recovery rate of nitrogen,phosphorus and potassium fertilizer was 12.28%,4.93% and 17.56% respectively.Comprehensively considering maize yield,soil available nutrients and nutrient accumulation,nitrogen is the main limiting factor of high-yielding summer maize,followed by potassium and phosphorus.