Effect of Long-term Application of Fertilizer on Wheat Yield and Fertilizer Use Efficiency in Loess Plateau

The effect of fertilization on wheat yield and fertilizer use efficiency(FUE) was studied based on 20 years long-term experiment on Loess Plateau.The results showed that: P application can increase wheat yield by 152.0 kg/ha and nitrogen application can increase wheat yield by 256.3 kg/ha.Compared with P application,the combination of N and P application can increase the wheat yield by 1 780.1 kg/ha.The combination of N,P and manure can increase wheat yield by 1 872.1 kg/ha(about 54.7%).The fertilizer use efficiency(F U E) was low when only one kind of fertilizer was applied.The combination of N and P can increase the absorbed amounts of N,P_2O_5 and K_2O,significantly.Compared with single application of fertilizer,the compination of N and P can increase FUE of N and P by 21.2 and 6.9 percentage points.Compared with the combination of N and P,the N uptake increase 18.2 kg/ha,P uptake increase 4.1 kg/ha,K uptake increase 8.3 kg/ha when applying the combination of N,P and manure.