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油菜套播模式是利用双季稻区冬闲田的有效手段,共生期与播量是影响套播油菜产量的关键因素。为探讨其对套播油菜产量的影响规律,设计共生期及播量裂区试验,调查油菜生长及产量形成。结果表明:(1)各处理条件下油菜密度随生育期推迟而下降,油菜套播有利于提高出苗期密度,但其他生育期的密度降幅随共生期延长而增加;(2)共生期与播量显著影响着油菜各生育期密度,且对三叶期密度存在极显著正互作效应,两试点成熟期密度在共生10d、播量为9.0kg hm–2的处理达最高值。(3)共生期及播量均影响着油菜各生育期的生长发育状况,延长共生时间可增加叶面积指数,但易线苗、油菜叶面积指数等指标随播量增加而增加,导致其产量构成因素、单株产量及小区产量改变。与CK比,套播可显著提高油菜产量,且以共生10d、播量9.0kg hm–2为宜。
Rape intercropping mode is an effective method to utilize winter fallow field in double cropping rice area. Symbiotic period and sowing rate are the key factors affecting the yield of rapeseed. In order to explore its influence on the yield of intercropped rape, the symbiotic period and sowing interval were designed to investigate the rape growth and yield formation. The results showed that: (1) The rapeseed density decreased with the delay of growth stage under all treatment conditions, and the rapeseed interception was helpful to increase the seedling density, but the density decrease at other growth stages increased with the prolongation of symbiosis; (2) Had a significant positive effect on the density of the three-leaf stage. The density of the two experimental stages reached the highest value at the symbiosis of 10 days and the sowing rate of 9.0 kg hm-2. (3) The symbiotic period and sowing rate all affected the growth and development status of rapeseed at each growth stage, prolonging the symbiotic time could increase the leaf area index, but the index of leaf area index of easy-sowing line and rapeseed increased with the increase of sowing rate, Constituent factors, single plant yield and community yield changes. Compared with CK, intercropping can significantly increase the yield of rape, and the symbiosis 10d, sowing 9.0kg hm-2 is appropriate.