Effects of Balanced Fertilization and Phosphor on Spring Corn Yield and Nutrients Utilization Rate

System study method of soil nutrients applied to study effect of balanced fertilization and phosphor on corn yield and nutrients using ratio of N,P,K and nutrients limited factors of corn yield in dank and high area at the base of knowing nutrients status of soil and balancing other micronutrients in soil.The result showed that N,P,K were main nutrients factors to limit corn yield increasing while other micronutrients in soil were balanced,and limited order was P K N,and balanced fertilization increased corn yield and nutrients using ratio of N,P,K and advanced corn to absorb N,P,and K,and applying phosphor increased corn yield after balancing other micronutrients,and corn yield increased with dosage of phosphor increased,the fitting dosage of phosphor could increase nutrients utilization rate,and the investment profit of phosphor as well as increase corn yield.So the best dosage of phosphor was 150 kg/ha,and the best treatment of balanced fertilization was OPT.