Two summer maize cultivars

Zhengdan958 and Nongda108

were used

and the effect of different types of nitrogen fertilizer(NF) and different application rates on water and nitrogen utilization and apparent budget of soil nitrogen were studied.The main results are as follows:(1)With the increment of N application rate

yield

water use amount and water produce efficiency(WPE) increased but nitrogen use efficiency(NUE) decreased.(2)There existed obvious genotype difference in WPE and NUE in summer maize.WPE of Zhengdan958 was bigger than that of Nongda108

and NUE of Nongda108 was bigger.(3)WPE and NUE were affected by type of NF.As for WPE of Zhengdan958

compound fertilizer>common urea>coated urea

but the difference among treatments of Nongda108 was smaller

that of compound fertilizer was bigger and that of the other two type of NF was equal nearly.Compared with common urea

NUE of coated urea and compound fertilizer was bigger

especially when 90 kg N/hm~2 for Zhengdan958 and 180 kg N/hm~2 for Nongda108.(4)After summer maize season

all treatments of two cultivars showed soil N deficit(SND) and the amount of SND decreased with the increment of N application rate.In common

amount of SND of Zhengdan958 was bigger than that of Nongda108.The amount of soil N apparent deficit of three type NF showed compound fertilizer>coated urea>common urea.