油菜比禾谷类作物更需要S,这是因为不仅其蛋白质的合成离不开S,而且油菜的主要产物一油的合成也需要S。因此油菜籽的生产对缺S非常敏感。在既缺N又缺S的土壤上,单施N反会引起菜籽减产,而单施S亦不能取得增产效果。尽管油菜的N素和S素营养的密切关系已得到充分肯定,但对于油菜对N、S的相对需要量以及油菜生长期间施用S肥的农学效果却几乎一无所知。本研究的目的如下:(1)确定各级N、S用量对油菜产量、养分吸收及其在植株体内分 Rape requires S more than cereal crops because not only is its protein synthesis inseparable from S, but it is also required for the synthesis of oil, a major product of rape. Therefore, the production of rapeseed is very sensitive to lack of S. In the soil lacking N and lacking S, applying N-N alone would result in a decrease of rapeseed yield, while S alone could not achieve a yield increase. Although the close relationship between N and S nutrients in rapeseed has been well established, there is little known about the relative requirements of rape to N, S and the agronomic effect of applying S fertilizers during rapeseed growth. The purpose of this study is as follows: (1) To determine the N, S dosage at all levels of rapeseed production, nutrient uptake and plant in vivo