Abstract: Against a background of a series of serious problems of nitrogen environmental pollution and waste of residue resources in summer maize production in the North China Plain, China Agricultural University and Hohenheim University of Germany have engaged in the Sino-Germany co-operative project, the environmentally acceptable and sustainable agricultural production with high productivity level in the North China Plain since 1999.A part of the results of the research were reported on winter wheat in the Beijing experimental base in 2000-2001. The results were as follows: At the same measuring date, The difference in dry matter weight (DMW) between the three treatments was insignificant; from jointing to flowering, dry matter accumulation rate and DMW of the optimized fertilization were not less than that of the traditional fertilization, from flowering to grain filling, dry matter accumulation rate and DMW of the optimized fertilization were slightly less than that of the traditional fertilization; at the two stages, dry matter accumulation rate and DMW of the optimized fertilization of the optimized fertilization with crop residues were greatest. The difference in yield between the three treatments was insignificant. Nitrogen use efficiency of the optimized fertilization and the optimized fertilization with crop residues were remarkably greater than that of the unreasonable traditional fertilization.

Key words: Summer maize, Optimized fertilization, Dry matter accumulation

CLC Number: 

• S513