l The functions of zinc sulfate

Zinc can promote the photosynthesis of crops. Zinc is a special active ion of carbonic anhydrase in plant chloroplasts, which can catalyze the hydration of carbon dioxide during photosynthesis. Zinc is also an activator of aldolase, one of the key enzymes in photosynthesis.

Zinc can participate in the synthesis of auxin indole acetic acid, zinc can promote the synthesis of tryptophan between indole and serine, tryptophan is the precursor of auxin synthesis, so zinc indirectly affects the formation of auxin. When zinc is deficient, auxin synthesis in crops is reduced, especially in buds and stems. Crop growth is stagnant, leaves become smaller, internode shorten, and lobular clusters form as symptoms.

Zinc can promote crop protein synthesis, and zinc is closely related to protein synthesis. RNA polymerase contains zinc, which is a necessary enzyme for protein synthesis. At the same time, zinc is not only a component of ribosomes, but also a necessary substance for maintaining the structural integrity of ribosomes. Zinc is a necessary component to stabilize ribose in crop cells, and zinc deficiency in crops also reduces RNA and ribosomes. In recent years. Normal ribosomes were found to contain zinc. When zinc is deficient, such cells are highly unstable, suggesting that zinc is an important component in stabilizing cellular ribosomes.

Effect of zinc on reproductive organs of crops. Under zinc deficiency condition, tomato buds are long round and sepals are sparsely covered. As the buds grow, anther growth stagnates. The length of anthers is only about 1/3 of that of normal anthers. The style and ovary are slightly thicker than normal plants, but the buds fail to open and begin to fall off. Normal pollen grains cannot form in anthers.

l The types of zinc sulfate

Zinc sulfate heptahydrate: Usually colorless orthogonal crystalline, granular, or powdered solid with a melting point of 100 degrees. Zinc sulfate heptahydrate is soluble in water, insoluble in alcohol and acetone, and the aqueous solution is weakly acidic. It is easily weathered in dry air.