Zinc fertilizer application contraindications

It is effective to apply zinc fertilizer on blindly applied zinc-deficient plots and zinc-sensitive crops. Therefore, the application of zinc fertilizers should vary from place to place and from crop to crop, and should not be applied blindly. 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.

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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[Attention]
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