我县地处长江口,单季稻、双季稻并存,稻棉、稻麦、稻油轮作。油菜品种以早熟品种宁油7号为主。油菜的前茬多为双三熟制后季稻,移栽期多在11月下旬,为晚茬油菜。为了探索晚茬油菜的高产规律,我们逐步摸索出了培育好“四苗”的一套技术措施,增产效果显著,1979年9块试验田亩产296—434.5斤,平均364.6斤。 My county is located in the mouth of the Yangtze River, single-season rice, double crop rice co-exist, rice cotton, rice and wheat, rice oil rotation. Rape varieties to early maturing varieties Ningyou 7. The stubble of rape mostly double double three cooked rice, transplanting more in late November, late crop rape. In order to explore the law of high yield of late crop of rape, we gradually found out a set of technical measures to cultivate the “four seedlings”. The yield increase was remarkable. In 1979, the yield of 9 plots was 296-434.5 kg, an average of 364.6 kg.