玉米是对锌特别敏感的作物,当玉米缺锌时,早期在叶片上出现斑点,逐渐叶片失绿。出现“白芽病”,生长后期,果穗缺粒秃尖;河北省大部分是石灰性土壤,土壤反应是碱性,在碱性条件下,土壤中锌的有效性降低,不易被作物吸收;再者随在土壤中施 Corn is particularly sensitive to zinc crops, when corn zinc deficiency, the early spot on the leaves appear, and gradually leaves green. There was “white bud disease”, and the late growth stage, the ear spikellet was bare; the most of Hebei Province was calcareous soil, the soil reaction was alkaline, the availability of zinc in the soil decreased under alkaline conditions, which was not easy to be absorbed by crops; In addition with the soil facilities