不同密度膜侧沟播油菜的植株性状表现及产量效应

为进一步完善油菜膜侧沟播栽培技术体系,本试验研究了不同密度膜侧沟播油菜的植株性状表现及产量效应。结果表明:稀植虽有利于改善油菜部分性状指标的增加,并最终表现出单株产量优势,但随着油菜生长期的延长,不同密度处理间差异逐渐缩小。适宜密度种植油菜的分枝数、叶面积以及部分生理指标等均优于低密度或高密度种植。种植密度与单位面积产量的灰色关联度高于单株产量。我国西北沿山干旱区膜侧沟播种植油菜的适宜密度以4.5万株/667m2最为适宜,可比当前生产上推行的密度(3.0万株/667m2)增产39%以上。

Plant characters and yield of rape with different planting density under ridge film mulching and furrow seeding

In order to improve the technical system of ridge film mulching and furrow seeding for rape,an experiment was conducted to compare rape plant morphological and physiological characters and yield under different density.The result showed that thin planting was beneficial to part of character parameters and finally increased per plant yield,but the amount of dissimilarity among treatments decreased gradually with the growing time.The expression of number of branch,leaf area and part of physiological characters of rape under appropriate density were all superior to that of low or high density.Grey correlative degree on density to per unit yield was higher than that of density to per plant yield.In dry mountainous areas of western China,it is recommended to plant at 45 000/666.7m2 under ridge film mulching and furrow seeding,which may achieve 39% higher output than the existing local planting density of 30 000/666.7m2.