陕西省冬小麦产量构成因素演变规律

以陕西省不同育成年代冬小麦品种为供试材料，探究品种更替过程中冬小麦产量构成因素的演变规律。结果表明：陕西省冬小麦产量在品种更替中显著增加，穗粒数和千粒重具有相同趋势，而穗数无显著变化。对产量增加贡献最大的是穗粒数，其次是千粒重。不同粒位粒数、粒重在品种更替中均显著增加，表现为GP1>GP2>GP3>GP4的规律。未来育种工作中应注重维持GP1、GP2位粒数和粒重，提升GP3、GP4位粒数和粒重，以进一步提升产量。

Evolution Rule of Yield Components for Winter Wheat in Shaanxi

To explore the change trend of yield components during the replacement of the cultivar , the winter wheat cultivars for wide extension over the years in Shaanxi Province were taken as object. The results showed that yield of winter wheat in Shaanxi Province significantly increased, and the same as grain number per spike and thousand grain weight. While spike number did not change significantly. The grain numbers per spike could contribute greatest to the increase of yield , and the thousand grain weight was followed.Both the grain weight and grain number increased and it showed the trend of GP1>GP2>GP3>GP4. In the future, yield could be boosted by enhancing grain number and grain weight at GP3 and GP4, and maintaining those at GP1 and GP2. ;