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秋发油菜主要技术指标是,秋末(11月底)苗子有绿叶9～10片,叶面积指数1.5以上;到越冬前(12月底)苗子绿叶达12～13片,叶面积指数2.5以上。这种油菜称为秋发生长型。研究表明,在长江上、中游地区秋发型油菜比冬发型油菜(9～10叶越冬)及冬壮型油菜(7～8叶越冬)增产显著,亩产可
The main technical index of autumn rape is that there are 9 to 10 green leaves and the leaf area index above 1.5 at the end of autumn (the end of November); and 12 to 13 green leaves before the winter (at the end of December) with the leaf area index above 2.5. This type of rape is called a fall hair growth type. The results showed that in the middle and upper reaches of the Yangtze River, the yield of autumn-type rape was more than that of winter-type rape (wintering 9-10) and winter-type rape (wintering 7-8)