播期和播种密度对周麦18号产量及产量构成的影响

在低(180万株/hm2)、中(270万株/hm2)、高(330万株/hm2)3种播种密度条件下,研究了不同播期对周麦18号产量和产量构成的影响。结果表明,在相同播种密度下,不同播期对小麦产量影响有极显著差异;在相同播期下,不同播种密度对产量影响差异不显著。播期对周麦18号成穗数和千粒重有极显著影响,对穗粒数影响较小。成穗数是决定周麦18号产量的关键因素,但同时也制约穗粒数和千粒重对产量的贡献。保证周麦18号高产的适宜播期为10月8日～10月15日,播种密度范围较广(180万～330万株/hm2),早播适宜低密度,播期推迟,密度适当增加。

Effects of Different Planting Date and Density on Yield and Yield Components of Winter Wheat Zhoumai18

Effects of different sowing dates on yield and yield components of Zhoumai 18 were studied under 1.8 million plants/hm2,2.7 million plants/hm2 and 3.3 million plants/hm2 planting density condition.The results showed that effects of different sowing dates on yield were significantly difference under the same planting density conditions.The effect of different planting density on yield under the same sowing date condition was not significant.However,the effect of sowing dates was significant on spike number and 1000-grain weight of Zhoumai 18,but not significant on grains per spike.The spike number was one of the key factors determining the yield of Zhoumai 18.Yield of Zhoumai 18 would reach to higher level under the sowing dates of Oct 8 to 15 and planting density of 1.8 million to 3.3 million plants/hm2.