Effects of Nitrogen Application Time on Carbon Assimilate and Nitrogen Translocation and Nitrogen Use Efficiency of Summer Maize

doi:10.7668/hbnxb.2009.03.043

Abstract

Abstract: Aimed to reduce pollution of nitrogen fertilizer(NF)and heighten nitrogen use efficiency(NUE)in summer maize,effects of nitrogen application time(applied nitrogen in 32leaf stage,applied nitrogen in 122leaf stage,applied nitro2 gen in 32leaf stage and 122leaf stage)on carbon assimilate and nitrogen translocation and NUE were studied in 2007. The main results as follows,nitrogen application reduced the amounts and remobilization rate of per2anthesis stored assimilates and total amount of pre2anthesis stored assimilate,weakened the ability of per2anthesis stored assimilates re2transportation to grain.Nitrogen application reduced the amounts and remobilization rate of per2anthesis stored nitrogen,increased the content of nitrogen in grain. In treatments of three nitrogen application time,the NUE of treatment of applied nitrogen in 32leaf stage and 122leaf stage was top,and increased 2118 percent pionts and 2218 persent points than the others,it im2 proved the NUE of summer maize in the stage,and reduced the farm pollution by losing of nitrogen.

Key words: Summer maize, N application time, Assimilate transportation, NUE

CLC Number:

S513
S143

XIA Lai kun, TAo Hong bin, ZHU Jin cheng, XU Jie, WANG Pu. Effects of Nitrogen Application Time on Carbon Assimilate and Nitrogen Translocation and Nitrogen Use Efficiency of Summer Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(3): 208-211. doi: 10.7668/hbnxb.2009.03.043.

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