大棚黄瓜叶色的诊断大棚黄瓜在生长发育期间如遇到营养不良、营养过剩、管理不善的外界环境条件，往往出现黄叶、褐叶等色变现象，生长发育受阻。引起黄瓜叶片色变的原因很多，只有摸清原因，对症下药，才能收到好的防效。缺氮型黄叶。主要表现下部叶片首先失绿变黄，然后... Greenhouse cucumber leaf color diagnosis Greenhouse cucumber growth and development during the encounter such as malnutrition, excess nutrients, poor management of the external environmental conditions, often yellow discoloration, brown leaf discoloration, growth and development blocked. Cucumber leaves cause color change for many reasons, only to find out the reason, the right medicine, in order to receive good control effect. Nitrogen-deficient yellow leaves. The main performance of the lower part of the first green leaves turn yellow, and then ...