Zinc Zinc is absorbed by the plant in the form of Zn2 +and an essential element for the synthesis of auxin precursors – tryptophan. Zinc is a component of carbonic anhydrase (CA), which catalyzes the reaction of CO2 + H2O = H2CO3. As the plant absorption and removal of CO2 are usually first dissolved in water, so when the lack of zinc breathing and photosynthesis, it will be affected. Zinc is also a component of glutamate dehydrogenase and carboxypeptidase, so it also plays a role in nitrogen metabolism. Application of zinc fertilizer can increase the weight of the grain.

When plants lack of zinc, the first leaves in the leaves appear green, leaves pale green, and some to reddish-brown, severe leaves become red withered. Growth is inhibited, plants are short. Zinc deficiency in the late, reproductive growth blocked, significant reduction.