油菜苗期常出现红叶和黄叶两种异常现象。应找出原因,及时采取对应措施。 1.干旱红叶:油菜苗期,若久旱不雨,或土壤水份不足,油菜因缺水生长缓慢,植株矮小,叶色呈现淡红色。对此要及时沟灌抗旱,并结合追施冬前肥,促使油菜转向正常生长。 2.渍害红叶:冬前雨水过多,使地下水位升高,排水不畅造成土壤渍水,通透性不良,油菜根系生长 Rape seedling often appear red leaves and yellow leaves two anomalies. Should find out the reason, take corresponding measures in time. 1. Drought leaves: rape seedlings, if a long drought does not rain, or insufficient soil moisture, rape grow slowly due to lack of water, plants are short, the leaves appear pink. This should be timely ditch irrigation, combined with topdressing fertilizer winter, prompting canola to normal growth. 2 stains leaves: before the winter too much rain, so that the groundwater level rise, poor drainage caused by soil waterlogging, poor permeability, root growth of rape