| This paper studied the effects of long-term fertilization on wheat yield,fertilizer use efficiency(FUE) and soil fertility in the test station of Changwu in Loess Plateau.The results showed that the yield increase and the increase rate of the single application of nitrogenous(N) or phosphorus(P) fertilizer were low,there was no significant difference between the single application of N or P and CK,the combined application of N with P and the combined application of N,P and K could increase the yield significantly.The FUE of P of the single application of phosphorus fertilizer was 1%,which was the lowest;the FUE of N of the single application of nitrogenous fertilizer was 12.5%;the FUE of P of the combined application of N with P significantly increased the FUE of P and N.Compared with the combined application of N with P,the combined application of N,P and K increased the FUE of P by 2.2%,but declined the FUE of N by 4.5%;the FUE of K of the combined application of N,P and K was 7.3%,which was low.The single application of phosphorus fertilizer only increased soil P,but declined soil N;the single application of nitrogenous fertilizer increased soil N and increased available P by 31%,and the combined application of N with P increased soil organic matter,soil N and P.The potassium fertilizer had no effect on the yield increase in dry-land of Loess Plateau. |