Prevent excessive application. When the concentration of zinc is appropriate, it can promote the growth of crops, the effect of over-low is not obvious, and if it is too high, it will have a toxic effect on crops or affect the health of people and livestock. When zinc is used as the base fertilizer, generally 1 to 2 kg of zinc sulfate is applied per mu, and when the top dressing is applied, 0.75 to 1 kg of fine soil is applied per mu. For extra-root spraying, 90-180 grams of zinc sulfate per acre is used to spray 60 kg of water on sunny days. Spraying maize should be carried out at the seedling stage, rice during the tillering stage, wheat during the jointing stage, and celery and spinach at the seedling stage. Alkaline soil can be used to increase the amount.

Prevention and phosphate fertilizer application. Due to the combined application of zinc and phosphate fertilizers, it is easy to form zinc phosphate precipitates, not only reduce the effectiveness of zinc, but also reduce the effectiveness of phosphate fertilizers, but the interval between the two, according to the soil conditions appropriate application of phosphorus, zinc fertilizer, increase production is obvious .

Anti-alkaline fertilizers and alkaline pesticides are mixed. Zinc is mixed with lime, grass ash, ammonia, and other alkaline fertilizers to show acidic ions, which react with alkaline ions to reduce the effect of fertilizers. Similarly, when zinc fertilizers are mixed with alkaline pesticides such as Bordeaux mixture, lime sulfur, and rosin mixture, the effectiveness of zinc and pesticides will decrease.

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