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《Acta Agronomica Sinica》 2005-08
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Effects of Different N Management Modes on Grain Yield and Quality as Well as Fertilizer N Use Efficiency of Winter Wheat

HE Ming-Rong1, YANG Wen-Yu1, WANG Xiao-Ying1, WANG Zhen-Lin1,YANG Wan-Li2(1Agronomy College, Shandong Agricultural University, Key Laboratory of Crop Biology of Shandong Province, Tai'an 271018, Shandong;2Agronomy College,Liaocheng University,Liaockeng 252000,Shandong, China)  
Both grain yield and quality can be improved through nitrogen (N) fertilization strategies, such as the rates and timings of N fertilization. Under N limiting soil condition, split application of N fertilizer (50% of total N fertilizer is applied at preplanting and the remainder at jointing) is known to increase grain yield and protein content and alter flour functionality. However, fewer studies are available on the effects of N fertilization on quality traits and nitrate N accumulation in the soil as well as N fertilizer use efficiency under N non-limiting soil condition, particular with all N fertilizer top-dressed at jointing. So the aim of present work was to assess the effects of different N management mode on the protein composition and dough rheological properties of wheat plant grown in the field with high fertility. The effect of N fertilization on N balance between wheat plant and soil and N fertilizer use efficiency was also determined with the aid of ((15)N) trace technique. It was found that N fertilizer had no effect on grain yield, protein content and wet gluten content(Table 2), whereas those protein quality parameters such as sedimentation volume, dough developmental time and dough stability time were improved remarkably. Comparing with N split application treatments (50% of total N fertilizer was applied at preplanting and the remainder at jointing), all N fertilizer top-dressed at jointing led to significant increase of sedimentation volume, dough developmental time and dough stability time(Table 3), while the nitrate nitrogen content (kg/ha) in the soil from 0 to 100 cm was also increased significantly (Fig.1), which means raised possibility of leaching and polluting underground water. As the amount of N application decreased from 240 kg/ha to 168 kg/ha, fertilizer nitrogen use efficiency was raised obviously (Table 5 ) and nitrate nitrogen accumulation in the soil from 0 to 100 cm was lessened (Fig.1). Therefore, for the sake of increasing grain yield, improving grain quality, enhancing fertilizer N use efficiency and reducing nitrate nitrogen content in the soil, it is proposed that all N fertilizer could be applied as topdressing at jointing with the amount less than 168 kg/ha.
【Fund】: 国家“十五”科技攻关项目(2002BA516A12)资助。
【CateGory Index】: S512.11
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