种植密度对宁夏春小麦新品种(系)群体结构及产量的影响

Influence of Planting Density on Group Structure and Yield of New Spring Wheat Varieties (lines) in Ningxia

采取裂区试验设计,研究不同种植密度对宁夏春小麦新品种(系)群体结构及产量的影响,以期筛选最佳种植密度。结果表明,叶面积系数、茎蘖数及产量随种植密度的增加而增加,在一定密度时达到最大值,种植密度再增加,叶面积系数、茎蘖数及产量出现下降趋势;在低种植密度时更有利于千粒重、穗粒数的增加;有效穗数各品种(系)受品种特性影响随密度梯度的增加表现不一;种植密度的变化对产量的影响虽未达到显著水平,但表现出规律性变化;宁春4号、宁春51号和宁春52号推荐在450万株/hm2或稍高密度下种植,永1937、宁春50号推荐在540万株/hm2密度下种植。

This test focuses on the influence of planting density on group structure and yield of new spring wheat varieties （lines） in Ningxia by a split plot design to screen the best planting density. The results showed that leaf area index, tiller numbers and yield were increased with the increasing of planting density and maximized at a certain density. After that with a continual increase in planting density, leaf area index, tiller numbers and yield decreased. It was beneficial to increase the 1000-grain weight and number of grain per ear on low planting density. Number of productive ear in each variety （line） displayed differences when planting density changed. Influence of planting density on yield was not significant, but showed a regular change. Suggestively, Ningchun 4, Ningchun 51 and Ning-chun 52 could be planted in 4.5 million plants per hectare or slightly high ;Yong 1937 and Ningchun 50 could be planted in 5.4 million plants per hectare.