It is only effective to apply zinc fertilizer to zinc-deficient plots and zinc-sensitive crops. In general, when the soil effective zinc content is less than 0.5 mg / kg, the application of zinc fertilizer has a significant effect on increasing yield. When the soil effective zinc content is higher than 1 mg / kg, the effect of applying zinc fertilizer is not significant. The most sensitive crops for zinc are rice, corn, sorghum, soybeans, tomatoes, etc. Medium-sensitive crops include potatoes, onions, beets, etc., and the application of zinc fertilizer should be given special attention to these crops.

Zinc fertilizer is a micro-fertilizer. The crop needs less for it, and it can't be used more. Excessive application levels have a toxic effect on crops. When zinc fertilizer is used as the base fertilizer, according to the degree of zinc deficiency in the soil, generally 0.5 to 2 kg of zinc sulfate per acre is applied; when topdressing is applied, 0.75 to 1 kg of zinc sulfate per acre is applied. Mix with appropriate amount of fine soil, or apply 90-180 grams of zinc sulfate per acre to 60 kilograms of water for spraying on sunny days.

Avoid mixing with alkaline fertilizers, pesticides, zinc fertilizers and alkaline fertilizers such as lime, grass ash, and ammonia. It is characterized by chemical reactions between acidic ions and alkaline ions to reduce fertilizer efficiency. Similarly, zinc fertilizer is mixed with alkaline pesticides such as Bordeaux mixture, stone sulphur mixture and rosin mixture, and the effectiveness of zinc and pesticides decreases.

The effect and role of zinc fertilizer How to use zinc fertilizer in agricultural planting? After the application of zinc fertilizer, the effect is very small in the same year. In the second year, the fertilizer effect can be fully exerted. This is what people call "the zinc fertilizer has the aftereffect". Therefore, the zinc fertilizer does not need to be applied year after year, and the application effect is generally good every other year. The combination of zinc fertilizer and phosphate fertilizer is easy to form zinc phosphate precipitate, which not only reduces the effectiveness of zinc fertilizer, but also reduces the effectiveness of phosphate fertilizer.

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