农作物缺锌时,大多是顶端先受影响,生长缓慢或者停止生长,节间缩短,主茎矮小。果树缺锌则多有顶枯现象。玉米:出苗7天就能见缺锌症状.主要表现是,叶脉间出现浅黄色或白色条纹,有时叶片或叶缘出现白色斑点并且迅速扩大,甚至坏死。有的叶面半透明或沿失绿条纹裂开,部分叶缘也可坏死。有的新 Zinc deficient crops, mostly the top of the first affected, slow growth or stop growing, internodes shortening, short stalks. Zinc deficiency is more fruit trees top dead phenomenon. Corn: Zinc deficiency can be seen in 7 days after emergence, the main manifestation is the appearance of light yellow or white streaks between the veins, and sometimes the white spots on leaves or leaf margins and rapidly expanding or even necrosis. Some leaf translucent or along the green stripe split, part of the leaf margin can also be necrosis. Some new