Effect of Long-term Fertilization on Soil Nutrients and Corn Yield

The results from long-term fertilization field experiment in FengCheng of Liaoning indicated that,each of fertilization treatments increased soil organic matter,available N,P and K content,compared to no fertilization treatment.The effect was shown better with organic fertilizer combined with chemical fertilizer than the corresponding application of any of them alone.And it also was shown better with combined fertilization of N,P and K or N and P than N fertilization alone.The changing law of corn yield affected by fertilizations was similar to soil nutrients studied.Corn yield was significantly correlated with soil organic matter,available N and P contents.So,the conclusion that,the proper combined fertilization of N,P and K based on organic fertilizer application is the optimal fertilization scheme to increase corn yield and soil fertility,can be made.