Effect of long term fertilization on fertility of Lou soil and crop yield

Based on the continuous fertilization experiment for 25 years at the same site on Lou soil in central Shannxi,this paper analyzed the difference of fertility in different plots.The results showed that long-term fertilization increased soil O.M.,total N,total P,available N,available P and corn yield evidently.Applying inorganic fertilizer or inorganic fertilizer combined with organic manure could raise soil nutrient capacity and supply intensity,and it was beneficial to meliorate soil and raise crop yield,in which the effect of inorganic fertilizer combined with organic manure was most remarkable.