不同播期对冬小麦碳氮运转和产量的影响

于2004～2005年在大田条件下,研究了不同播期对冬小麦植株C-N的积累、运转规律及籽粒产量和蛋白质含量的影响.结果表明,适当晚播(10月22日播种)可以提高冬小麦成熟期单茎籽粒重和籽粒氮素积累量,提高开花前营养器官贮存干物质和氮素的转运量以及转运干物质和氮素对籽粒重和籽粒氮素积累的贡献率.适当晚播的小麦穗粒数、千粒重和蛋白质含量有所增加,籽粒产量和蛋白质产量显著提高.由此可见,高产小麦适当晚播有利于籽粒产量和蛋白质产量的提高.

Effects of Different Sowing Date on Carbon and Nitrogen Assimilate Translocation and Yield in Winter Wheat

Field experiments with 4 winter wheat cultivars in 2004～2005 were conducted to investigate the effects of different sowing date on the carbon and nitrogen accumulation,translocation law,and grain yield and protein content.The results indicated that the suitable late-sowing(22 Oct.) in winter wheat could increase the grain weight and grain nitrogen accumulation of single stem during mature stage and enhance the transferring amount of the dry matter and nitrogen stored in nutrient organs before anthesis and the contribution rate of transferring dry matter and nitrogen to grain weight and grain nitrogen accumulation.It was concluded that the suitable late-sowing in high yield wheat could increase kernels per spike,1 000-kernel weight and protein content and improve the grain yield and protein yield significantly.