稻茬套播油菜种植密度与产量及其分枝习性的关系

Relationship Between Planting Density and Yield andBranch Characteristics of Rape Undersowed in Rice Field

试验研究了稻茬套播油菜种植密度与产量和分枝习性的关系。结果表明 :(1)在较低密度条件下 (1～ 3万株 6 6 7m2 ) ,油菜籽产量随着密度的增加呈递增趋势 ,其适宜的密度为 3万株 6 6 7m2 左右 ;超过3万株 6 6 7m2 ,油菜籽产量随着密度的增加呈递减趋势。 (2 )主攻油菜籽 14 0kg 6 6 7m2 的产量水平 ,适宜每株有效分枝数为 3～ 4个 ,群体有效分枝数为 10～ 12万个 6 6 7m2 ,分枝结角果数占总角果数的 75 %左右。

Effects of different planting densities on the yield and primary branch characteristics of rape undersowed in rice field were studied .The results were as follows. (1) The rapeseed yield increased with the planting density increasing when the density was between 1×10 4 ～3×10 4 plants/667m 2, when the density was greater than 3×10 4 plants/667m 2, the yield decreased with the density increasing. and the appropriate density was 3×10 4 plants/667m 2; (2)To obtain the yield of 140 kg/667m 2, the appropriate number of efficient primary branches per plant is 3～4 and that of the efficient colony branches is 10×10 4～12×10 4 branches /667m 2, and the ratio of pods of primary branches to total pods is about 75%.