A field experiment was carried out in order to identify the effect of rates and method of nitrogen application on grain yield of winter wheat

fertilizer nitrogen use efficiency

and accumulation of NO_3~--N

under water-saving cultivation system.The experiment was conducted at the Wuqiao Experiment Station of China Agriculture University

Cangzhou city

Hebei province.The experiment was designed as a random spot with three replications with the cultivar Shijiazhuang 8 No.The treatment were six nitrogen rate and method(0

157.5 0

88.5 69

157.5 69

123 103.5

226.5 0 and 157 138.5 N kg/hm~2).The nitrogen fertilizer was applied before sowing and at jointing

respectively.The results showed that the grain yield of winter wheat

which ranged from 7 618 to 8 063 kg/hm~2

did not respond to nitrogen fertilizer in water-saving cultivation system.The water use efficiency ranged from 1.72 to 1.86 kg/m~3.But the nitrogen use efficiency significantly increase at 0.05 level with the rates of nitrogen application.However

at the same time

the amounts of soil NO_3~--N residue at harvest significantly increase with the rates of nitrogen application also.The soil NO_3~--N content in 0~60 cm increase with the rates of nitrogen application at jointing

anthesis and harvest

respectively.The soil NO_3~--N content of two split application was higher than that of basal application when the nitrogen fertilizer rates was 157.5 kg/hm~2 at anthesis and harvest

respectively.Although

the soil NO_3~--N content of two split application was higher than that of basal application when the nitrogen fertilizer rates was 226.5 kg/hm~2 at anthesis

and results were opposite at harvest.The results suggested that under water-saving cultivation system winter wheat can achieve high grain yields

while lower soil NO_3~--N content with basal application at the level of 157.5 kg/hm~2 nitrogen fertilizer.