Zhengzhou Kailan Water Purification Materials Co., Ltd

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Zinc sulfate heptahydrate (ZnSO4 7H2O), also known as alum and zinc alum, is a colorless acicular or powdery crystal with a density of 1.957g/cm3, easily soluble in water, slightly deeper than ethanol And glycerin, gradually weathered in dry bath air. At 39 ℃, ZnSO4.7H2O loses one crystal water and changes to ZnSO4 6H2O; at 70 ℃, it loses another crystal water and changes to ZnSO4.H2O; at 280 ℃, it loses all crystal water and becomes anhydrous. When heated to 767 ℃, it decomposes into zinc oxide And sulfur trioxide.

Zinc sulfate heptahydrate is mainly the raw material for manufacturing lithopone and zinc salt, the mordant for printing and dyeing industry, the preservative for wood and leather, the insecticide for preventing fruit tree diseases and pests, the emetic for medicine, the bone glue clarification and preservative, and also an important auxiliary raw material for the production of chemical fiber. In addition, it is also used in electroplating, electrolysis and paper industry. Zinc sulfate heptahydrate is mainly used to produce zinc barium powder and other The raw material of zinc salt is also important for viscose fiber and nylon fiber Auxiliary materials It is also used as printing and dyeing agent, wood and leather agent, bone glue clarification and protective agent, medical emetic and fungicide. It is also used for electroplating, flotation of ore, prevention of fruit seedling diseases and treatment of circulating cooling water.

Zinc sulfate, also known as zinc fertilizer, granular zinc, large grain zinc fertilizer, etc., is mainly used for feed additives, agricultural fertilizers and industrial purposes according to different customers and regions.

Zinc deficiency in crops is a common deficiency of trace elements. The common characteristics of crop zinc deficiency are: the leaves lose green, the internodes are shortened, clusters and leaflets are clustered, the plant is short, and the growth is restricted, resulting in physiological diseases such as "stiff seedlings", "white flowers seedlings", "small fruits", and high rate of empty seeds and low yield. The application of zinc fertilizer can promote the growth and development of crops, increase the seed setting rate, strengthen the cold resistance and disease resistance of crops, increase the yield by 10% to 30%, and significantly improve the quality of agricultural products.

1、 Typical symptoms of zinc deficiency in crops

Maize: the leaves lose their green color and have brown spots, forming a "white flower seedling", and the ear is short of grain and bald.

Wheat: white green stripes or bands appear on both sides of leaf veins, with short internodes, late heading and flowering, and irregular. In case of severe zinc deficiency, no heading can be carried out, and the spikelets are light.

Fruit trees: "yellow spot leaf disease": the veins of the upper and middle leaves of new shoots remain green, and the color is between the veins. "Leaflet disease": new leaves become smaller, and rosette clusters appear at the top. "Small fruit disease": small fruit with thick skin, lignified pulp, and juicy residue.

Vegetables: middle and upper leaves lose green, turn yellow and tender leaves are small, often called "lobular disease". The plant is short, the internode is shortened, clustered, the fruit is small and thick, the yield is low, and the quality is poor.

Correct use of zinc sulfate particles

1. Paddy field soil: the amount of granular zinc fertilizer per mu is 1-1.5 kg, which can be used as seedling bed fertilizer, combined with land preparation as rake fertilizer. Granular zinc fertilizer is mixed with granular fertilizer and fine soil and then sprayed.

2. Dry land soil: the amount of granular zinc fertilizer per mu is 1-1.5 kg. Before sowing and land preparation, the granular zinc fertilizer is mixed with compound (mixed) Hefei or fine soil and then sprayed, applied in strips or holes.

3. Application of fruit trees: the amount of granular zinc fertilizer for each fruit tree is 50-100g, which can be used together with compound fertilizer and agricultural production system fertilizer according to the size of the tree crown. It can be used as spring fertilizer, fruit strengthening fertilizer and sun returning fertilizer, and it can be applied along the tree crown along the drip line and then covered with soil.