Abstract: Excessive using and low efficiency of N-fertilizer have long been the obstacles for agriculture development. Now,N-fertilizer using with straw has being used in Large scales in summer maize. In this paper,two treatments were designed. The first was traditional N-fertilization which was designed by investigating the amount of N-fertilizer using in the village, that's 300 kg/ha. The second was optimized N-fertilization which was designed by the means of diagnosing the leaf, and the amount of N-fertilizer which the crop need in its growing stage was decided consequently. Comparing with the treatment of no N-fertilization, effects of two Nfertilization on the growth characteristics and yields of summer maize with straw in the field was studied. The results showed as fellows:There were no obvious differences between two types of N-fertilizer application on the plant height,leaf area, stem diameter and the number of root of the summer maize. These growth characteristics were better than those of control. To the traditional N-fertilizer application and optimized N-fertilizer applicanon,the yields were 7 297.65 kg/ha and 7 385.1 kg/ha, which has no obvious yield difference,but increased 33.03%and 34.63%compared with the yield of control,it's 5 485.65 kg/ha. The optimized N-fertilizer application greatly reduced the N-fertilizer amount with good economic and ecological benefits.

Key words: Straw, N-fertilizer, Summer Maize

CLC Number: 

• S513.062