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中文摘要：
通过田间试验，研究了移栽密度对苏油4号油菜籽产量及关键品质的影响效应。结果表明：（1）在6万～18万株／hm^2的移栽密度范围内，随密度的加大，产量以极显著的幂函数趋势增加，增产原因在于通过密植极显著提高了产量形成关键时期的角果皮面积指数；（2）群体总角果数是提高苏油4号产量的关键因子，但每角粒数则是限制其高产形成的主要因素，千粒重对产量的贡献较小；（3）不同移栽密度条件下苏油4号油菜籽硫苷、蛋白质和棕榈酸、硬脂酸、油酸、亚油酸、亚麻酸、芥酸的差异不显著，但含油率依密度的增加而显著下降；（4）施纯氮262．5kg／hm^2条件下，苏油4号籽粒产量超4000kg／hm。的适宜密度为18万株／hm^2左右，适宜角果皮面积指数为4．9。
英文摘要：
A field experiment was conducted to study the effects of transplanting density on the yield and key quality of ＂Double Low＂ rape variety Suyou No. 4. The results showed as follows ： （ 1 ） In the range of 60000 - 180000 plants/hm^2, the yield increased by a significant power function trend as the transplanting density increased, because the surface area of rape pod index increased remarkably at the crucial stage of yield formation. （2） The No. of pod per unit area was the key factor to enhance the yield of Suyou No. 4, while No. of seed per pod was the main factor of restricting high yield, and 1000 -seed weight contributed less to yield. （3） The significant content differences were not observed in gIucosinolates, protein, palmific acid, oleic acid, iinoleic acid, linolenic acid and erucic acid of rapeseeds of Suyou No. 4 under different transplanting density conditions. But oil content was significantly decreased along with the increase of planting density. （4） Under the condition of applying 262.5 kg/hm^2 pure nitrogen, for obtaining high rapeseed yield （over 4000 kg/hm^2） of Suyou No. 4, the recommended planting density was about 180000 plants per hectare and proper index of pod area was 4.9.
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