春季是油菜营养生长与生殖生长两旺时期,也是油菜一生中吸肥量最多的时期,施肥是否合理,对产量有着举足轻重的影响。因此,必须从真抓好春季施肥。具体应掌握以下原则: (一)看苗施用返青肥。返青肥的使用,要根据菜苗长势而定,对春季肥力不足、个体小、叶片少、叶面 Spring rape vegetative and reproductive growth is thriving, but also rape the most fat absorption period, the fertilization is reasonable, the output has a decisive influence. Therefore, we must do a good job in spring fertilization. Specific should grasp the following principles: (A) to see Miao use green tea. The use of green turned back to fertilizer, according to the growth of vegetable shoots, lack of spring fertility, small individuals, fewer leaves, leaves