油菜(Brassica napus L)收获指数的变异

本文首次采用田间试验的方法对国内油菜收获指数的变异进行了研究．结果表明不同油菜品种的收获指数存在变异，其变异规律大致是：１）中熟品种的收获指数高于早熟品种及晚熟品种；２）中长角果的品种较长角品种具有更高的收获指数；３）高产的新品种具有较高的收获指数；４）油菜粒壳比，角杆比及千粒重与收获指数呈正相关，杆重与收获指数呈负相关．

The Variation of Harvest Index in Chinese Oilseed Rape

This is the first paper in China to study the variation of harvest index of rapeseed ( Brassica napus L.)by field trials.The results showed that the variation of harvest index existed among the different rapeseed varieties.The general laws were(a)harvest index in middle-ripened varieties was higher than early-ripened or late-ripened ones;(b)middle-pod varieties had higher harvest index than long-pod ones;(c)new and high yielding varieties shared the highest harvest index;(d)seed-pericarp ratio,pod-straw ratio and 1 000 -seed weight were positively correlated with harvest index of rapeseed,while the straw weight was negatively correlated with harvest index.