油菜在生长发育过程中,需要氮、磷、钾、硼、锌、硫等多种营养元素,如果缺少某一营养元素,就会从叶片上反映出其缺素的症状。对于油菜缺素病一旦出现,要立即采取补救措施。一、缺氮:油菜缺氮时,植株体内蛋白质的合成受阻,叶绿素含量减少,但碳水化合物积累,导至花青素形成,使叶片从老叶变红,渐向新生叶片发展。缺氮红叶的叶片带黄色,长势弱,叶片瘦小。同时,植株矮小,分枝少,角果数和粒数减少,粒重减轻,产量显著下降。在苗期,一般干旱脱肥容易出现缺氮红叶,此时,应立即采取补救措施,一般亩用7～8 Rape in the process of growth and development, the need for nitrogen, phosphorus, potassium, boron, zinc, sulfur and other nutrients, if a lack of a nutrient element, it will be reflected from the leaves of its lack of symptoms. For rapeseed deficiency disease in the event of immediate remedial measures to be taken. First, nitrogen deficiency: When rape nitrogen deficiency, the synthesis of protein in the body is blocked, chlorophyll content decreased, but the accumulation of carbohydrates, leading to the formation of anthocyanins, the leaves from the old leaves turn red, gradually emerging leaf development. Nitrogen-deficient leaves with yellow leaves, weak growth, thin leaves. At the same time, the plants are short, branches are few, the number of pods and grains are reduced, the grain weight is reduced, and the yield is obviously decreased. In seedling stage, the general drought prone to nitrogen deficiency red leaves, at this time, remedial measures should be taken immediately, the general mu 7 ~ 8