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油菜三类苗在生产上是一个较为笼统的概念。人们常常把根系发育差,叶片少而小,叶色发红,长势较弱的油菜苗称为三类苗,而对三类苗的形成原因则缺乏分析,在促使其转化时,片面强调施肥,有时不能起到促进作用,还适得其反。事实上三类苗的形成,是由于某一个主要因素所致,而且夹杂着多个因素综合作用的结果。就我省而言,油菜三类苗的成因,有播种过迟,移栽过晚,土壤瘠薄,地下水位太高,受干旱,冷冻和病虫为害等。现初步分析归类并对其提出相应的转化措施。
Rape three seedlings in the production is a more general concept. People often poor root system development, small and small leaves, leaf color red, weak growing rape seedlings as three types of seedlings, and the formation of three types of seedlings are the reasons for the lack of analysis, to promote its conversion, one-sided emphasis on fertilization , Sometimes can not play a catalytic role, but also counterproductive. In fact, the formation of three kinds of seedlings is due to one of the main factors, and mixed with the combined effect of multiple factors. In our province, the causes of the three types of seedlings rape, too late sowing, late transplanting, infertile soil, groundwater level is too high, subject to drought, freezing and pest damage. Now preliminary analysis and classification and put forward the corresponding conversion measures.