油菜在生长期出现紫叶,其原因一是缺磷,二是缺硼。一般缺磷的主要症状为:秧苗期生长缓慢,叶片明显减少,叶厚而小,并呈暗紫色,叶柄变紫,叶脉边缘有紫红斑点。缺硼的主要症状为:根系发育不良,没有根毛和侧根,根端有小瘤状突起,根皮变褐色,茎开裂,生长点失绿,叶色暗绿,叶小,叶缘倒 Rape in the growing stage of purple leaves, the first reason is the lack of phosphorus, and second, lack of boron. The main symptoms of phosphorus deficiency in general are: slow growth of seedling stage, significantly reduced leaves, thick leaves and small, and dark purple, purple petiole, veins edge purple spots. The main symptoms of boron deficiency: root system dysplasia, there is no root hair and lateral roots, the root end of a small tumor-like protrusions, root bark brown, stem cracking, the growth of green, dark green leaves, leaves small,