Abstract: Aimed to reduce lose of nitrogen fertilizer(NF)and heighten nitrogen use efficiency(NUE)in summer maize,effects of different application rates of three types of NF(common urea,coated urea and compound fertilizer)on growth and development,NUE of summer maize cultivars Zhengdan958 and Nongda108 were studied in 2004.The main results as follows:Yields of two cultivars increased obviously with the increment of N application rate from 0-180 (kg/ha).The increment effect to yield of compound fertilizer was best under the same application rate,but the difference between three types of NF was not prominent.Grain number per ear of two cultivars increased with the increment of N application rate,and its relationship with type of NF was very weak.1000-grain weight was affected any more by type of NF,and there existed difference between cultivars.LAI,dry matter weight and leaf chlorophyll content increased with the increment of N application rate,and they were heightened more obviously by compound fertilizer and coated urea than by common urea.Compared to common urea,NUE of coated urea and compound fertilizer was higher respectively,but their nitrogen harvest index could not be heightened correspondingly.NUE of three types of NF exist genotype difference.

Key words: Summer maize, Type of NF, N application rate, Growth and development, NUE

CLC Number: 

• S143