Avoid excessive application of zinc fertilizer is micro-fertilizer, crops need less of it, more can not be applied, lack of no. 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 mu is applied; when topdressing is applied, 0.75 to 1 kg of zinc sulfate per acre is applied, and appropriate amount of fine soil is applied; Apply 90-180 g of zinc sulfate per acre to 60 kg of water and spray on sunny days.
Avoid the simultaneous application of zinc and phosphate fertilizers with phosphate fertilizer to form zinc phosphate precipitates, which not only reduces the effectiveness of zinc fertilizer, but also reduces the effectiveness of phosphate fertilizer.
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.
Avoid the application of zinc fertilizer in successive years, the effect is very small in the same year, the second year can fully exert the fertilizer effect, which is what people call "zinc fertilizer has aftereffect", so zinc fertilizer does not need to be applied year after year, generally the effect is good every other year.
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