葡萄黄叶子是由于缺铁而引起的。叶的症状最初出现在迅速展开的幼叶,叶脉间变黄,具绿色网脉,严重时叶片边缘卷起变褐坏死。此病主要是由于土壤情况限制了根的吸收,而不是土壤铁含量不足。粘土、排水不良的土壤,以及春天冷凉、潮湿天气造成葡萄沤根、根系腐烂,使养分不能及时供应上去而导 Grape yellow leaves are caused by iron deficiency. The symptoms of the leaves first appeared in the rapidly developing young leaves, yellowing between the veins, with green reticulate veins, and severe edging of the edges of the leaves to brown out necrosis. The disease is mainly due to soil conditions limiting the absorption of roots, rather than insufficient soil iron content. Clay, poorly drained soil, as well as cool, wet weather caused by grape roots, root rot, so that nutrients can not be timely supply up the guide