不同播期冬小麦生育规律的探讨

冬小麦的产量随着播种期的延迟而递减,适期晚播减产幅度不大,播种过晚产量明显下降。早、中播小麦冬前分蘖比例大,单株成穗多;晚播麦春季分蘖为主,分蘖成穗少。适期晚播主要使幼穗伸长、单棱和二棱三个分化期落后于早播。播期(除土里捂)对每穗粒数和千粒重的影响似乎不大。

Study on Patterns of the Growth and Development of Winter Wheat in Different Sowing Period

With the delay of sowing period, the yield of winter wheat progressively decreases. The range of decrease in grain yield in a moderately late sowing period is not great, but the decrease in yield is significant when the sowing is too late. The early or middle sowing period makes the percentage of tillers emerging before winter much higher, and the number of effective tillers per plant larger. The effect of sowing moderately late is primarily the delay of the phase of the elongating of young spike, single and double ridges. The effect of sowing period on the number of grain per spike and 1000-kernel weight seems not very great.