| This experiment was conducted to investigate the effects of different types of nitrogen fertilizer(NF) applied in summer maize season on yield,water and nitrogen utilization of summer maize and its aftercrop winter wheat in north China plain.The main results are as follows:(1) Yield,water consumption and water use efficiency(WUE) were increased by the increment of N application rate,while N use efficiency(NUE) was decreased.WUE and NUE of summer maize were affected by type of NF,WUE of compound fertilizer treatment was greater and NUE was improved by applying coated urea and compound fertilizer as compared to urea application,and clear genotype differences on WUE and NUE were observed,WUE of Zhengdan958 and NUE of Nongda108 were greater.(2) N physiological efficiency was decreased but NF efficiency was heightened in winter wheat by N application in summer maize,at the same time,yield and WUE of winter wheat were affected obviously,but the effects existed differences between different cultivars,types of NF and N rates.Evident aftereffect of NF applied in summer maize was observed in winter wheat,but the values were different among different types of NF.In common,aftereffects of urea treatments and 180 kg/hm2 treatment of coated urea and compound fertilizer were bigger.(3) In summer maize-winter wheat rotation system,total yield,total N accumulation amount,total water consumption,WUE and NUE were affected evidently by types of NF and N rates in summer maize season,and they also were affected by genotype of summer maize. |