施硫对不同筋力型品种小麦碳氮运转和产量的影响

在大田条件下,研究了不同施硫水平对不同筋力类型品种植株C-N积累与转运规律和籽粒产量及蛋白质、淀粉含量的影响.结果表明,施硫处理提高了两品种成熟期单茎籽粒重和籽粒氮素的积累量和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,与不施硫对照(S0)相比,每1 hm2施20 kg纯S(S1)处理能明显提高两品种的产量构成因素,显著提高籽粒产量,两品种分别增产10.69%和9.78%,同时极显著地提高了籽粒蛋白质和淀粉含量.大量施用硫肥(100 kg/hm2)处理的效果小于适量施用(20 kg/hm2)处理.试验结果表明,施用适量硫肥可以明显调节小麦植株C-N积累与运转,进而促进较高的籽粒产量和蛋白质、淀粉的积累.

Effects of Sulphur Application on Carbon and Nitrogen Assimilate Translocation and Grain Yield of Winter Wheat Cultivars with Different Gluten

Field experiments were conducted to investigate the effects of sulphur rates on characteristics of post-anthesis carbon and nitrogen assimilation and transfer, and grain yield,protein and starch contents,using wheat cultivars with different grain protein contents,i.e.Yumai 34(high protein content) and Yumai 50(low protein content).The results showed that,sulphur application of both cultivars increased grain weight and grain nitrogen accumulation of single stem, the transfer amount of dry matter and nitrogen to grains after anthesis and the contribution of transferred dry matter and nitrogen to grain were increased too.Comparing with no sulphur fertilizer application treatment(S1),the yield components with the treatment of 20 kg/hm2 sulphur application of both cultivars were obviously increased,and grain yield was significantly increased by 10.69% and 9.78%,meanwhile the contents of protein and starch were extremely significantly increased.The effects of high rate sulphur application(100 kg/hm2) treatment was inferior to moderate sulphur application(20 kg/hm2) treatment.The result showed that moderate rate of sulphur application could obviously regulate the assimilation and transfer of carbon and nitrogen,and increase grain yield and the accumulation of protein and starch.