In order to solve the problem of specific application of nitrogen fertilizer varying with the regional soil texture types

the light loam and clay loam were respectively set with no application of nitrogen fertilizer

and the ratios of base-topdressing nitrogen (N) fertilizer at 3:7

4:6

5:5

6:4 and 7:3. The yield

water and nitrogen utilization efficiency in wheat

dynamic changes of soil moisture

water storage

NH4+-N and NO3--N contents were studied. The results showed that the highest wheat yield

water use efficiency (WUE) and N production efficiency (NPE) of light loam soil with N base-topdressing ratio at 4:6 were 8 265.3 kg/hm2

27.6 kg/(hm2·mm) and 34.4 kg/kg

respectively. The highest wheat yield

WUE and NPE with N base topdressing ratio of 5:5 in clayey soil were 8 363.2 kg/hm2

28.3 kg/(hm2·mm) and 34.8 kg/kg

respectively. The vertical distribution of soil water content in different growth stages of wheat varied greatly. The water content of light loam soil was 9.3%~26.2%

while 9.7%~27.6% in clay soil. During the whole growth period of wheat

the soil water storage capacity increased at first and then decreased. The water storage capacity of clayey soil was higher than that of light loam. The higher the amount of N topdressing

the higher contents of NH4+-N and NO3--N in the surface soil

and the contents of NH4+-N and NO3--N decreased with the soil depth. Under precipitation

the contents of NH4+-N and NO3--N in light loam soil were easier to leach to the soil depth

and the contents of NH4+-N and NO3--N in clay loam soil were higher than those in the light loam at maturity. The results showed that the ability of water and N conservation in clayey soil was stronger than the light loam soil

and the ratio of base-topdressing N could be increased appropriately.