The pot experiment was conducted to study the effects of
soil water regime and fertilizer nitrogen rate on the yields,nitrogen
uptake and fertilizer nitrogen utilization of wheat by using
15 N tracer method.The results showed that the aboveground biomass,stem yield and grain yield increased with the increase of soil moisture in the fertilizer nitrogen treatments.All the yield increased with the increase of the fertilizer nitrogen rate in the
soil water treatments.It was found that both soil water regime and fertilizer nitrogen rate significantly influenced the amount of nitrogen uptake by wheat according to the variance analysis.The amount of nitrogen uptake increased with the rise of the soil moisture in fertilizer nitrogen treatments and the amount also increased with the increase of the urea nitrogen rate in the soil water regime.Soil water regimes not only had an impact on nitrogen uptake but also had a close relationship with soil nitrogen supply and fertilizer nitrogen use efficiency.The soil A values decreased in urea treatment and increased with the rise of the soil moisture in the combination treatment of urea with pig manure.The fertilizer nitrogen use efficiency rose with the rise of the soil moisture in the same fertilizer nitrogen treatment.The fertilizer nitrogen use efficiency of the urea treatment was 13\^3%,27\^9% and 32\^3% in the soils with 50%,70%and 90% of the field water capacity,respectively.The fertilizer nitrogen use efficiency in the combination treatment of urea with pig manure was 20\^0%,29\^9%and 34\^4% in the soils of above three levels,respectively.It was concluded that the low soil moisture restricted urea nitrogen use efficiency(UNUE) and the UNUE could be raised by combination treatment of urea with manure in the soil of enough moisture.\;