不同播期对夏玉米产量及产量构成的影响

目的]探讨不同播种时期对玉米籽粒产量的影响,并同时研究玉米的生育期、千粒重、穗数以及穗粒数的变化。方法]以郑单958及登海605为试验材料,通过不同时期播种研究不同播期对夏玉米产量及构成因素的影响。结果]随播种时期的推迟,玉米生育期推迟;玉米籽粒产量及千粒重降低,最大值出现在6月7日播期处理;玉米穗粒数先升高后降低,最大值出现在6月14日播期处理;穗数差异不显著。结论]在黄淮海现有的生态条件下,郑单958玉米及登海605适宜的播种时期为6月7日。

Effects of Different Sowing Dates on Grain Yield and Its Components of Summer Maize

Objective] To study effects of different sowing dates on grain yield and components of maize,as well as the variation of 1000-grain weight,grains per spike and spokes.Method] With Zhengdan 958 and Denghai 605 as test material,effects of different sowing dates on grain yield and its components of summer maize were studied by sowing winter wheat at different dates.Result] The results showed that the growth period of maize was delayed with the delaying of sowing date.Grain yield and 1000-grain weight of maize were decreased with the delaying of sowing date.Peak value of grain yield appeared on June 7.Grains per spike of maize were increased firstly and decreased with the delaying of sowing date then.The peak value of spokes appeared on June 14.The difference of the number of spokes was not significant.Conclusion] Suitable sowing date of Zhengdan 958 and Denghai 605 was about June 7 under the ecological conditions of Huang-Huai region.