播种期和种植密度对小麦新品种豫农202产量构成的影响

合理的播种期和种植密度有助于挖掘小麦品种的产量潜力。利用裂区试验研究了播种期和种植密度对小麦新品种豫农202产量及其构成因素的影响。结果表明:播种期对小麦新品种豫农202的产量及其构成因素影响较小,除对穗数的影响达到显著水平外,其他均不显著。种植密度则影响较大,除对千粒重的影响不显著外,其他均达到显著或极显著水平,特别是对穗数和穗粒数影响的显著程度非常高。在不同的播种期下各种植密度间产量差异较大,但产量构成因素差异较小。在不同播种期和种植密度下,穗数对产量的直接影响较大,其次是穗粒数,千粒重的直接影响很小。该品种的适宜播种期应该在10月8—25日,早播情况下选择120万株/hm2基本苗比较合适,中晚播情况下选择240万株/hm2。

Effect of Sowing Time and Seedling Density on the Yield Formation of a New Wheat Cultivar Yunong 202

The suitable combination of sowing time and seedling density is favorable for the yield increase of wheat cultivar. A field experiment with split plot design was conducted to study the suitable sowing time and seedling density of a New Wheat Cultivar Yunong 202. The results showed that sowing time had a smaller effect on yield and yield components of Yunong 202, and that had a significant effect only on spike number. Seedling density had a greater effect on yield and yield components except for 1000-kernel weight, especially, had a higher significant effect on spike number and grain number per ear. In different sowing times, yield differed greatly and yield components differed little among the seedling densities. In different sowing times and seedling densities, spike number had the greatest direct effect on yield, the second was grain number per ear, and 1000-kernel weight had the smallest. The most suitable sowing period is from Oct. 8 to Oct. 25, and the suitable seedling density is 1200000 plants /hm2 in earlier sowing time and 2400000 plants/hm2 in middle or later sowing time.