A blind use of blindness is only effective if zinc deficiency is applied to zinc-deficient land and zinc-sensitive crops. In general, when the effective zinc content of the soil is less than 0.5 mg/kg, the effect of applying zinc fertilizer is significant, and when the effective zinc content of the soil 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, and tomatoes. Moderately sensitive crops include potatoes, onions, and sugar beets. Special attention should be paid to the application of zinc fertilizer to these crops.
Second, avoid excessive application of zinc fertilizer is a micro-fertilizer, the crop needs less, more than necessary, the lack of no. The application amount exceeds the General Assembly and has a toxic effect on crops. When zinc fertilizer is used as a base fertilizer, according to the difference in the degree of soil zinc deficiency, 0.5 to 2 kg of zinc sulfate is applied per acre; when used as a top dressing, zinc sulfate is applied to 0.75 to 1 kg per acre. With appropriate amount of fine soil applicator, or per acre applied zinc sulfate 90 ~ 180 g 60 kg of water in sunny days can be sprayed.
The three bogey and phosphate fertilizer application of zinc fertilizer and phosphate fertilizer mixed application is easy to form zinc phosphate precipitates, not only reduce the effectiveness of zinc fertilizer, but also reduce the effectiveness of phosphate fertilizer.
Four bogey and alkaline fertilizers, pesticides mixed with zinc fertilizer and lime, grass ash, ammonia and other alkaline fertilizers mixed, showed that the acidic ions and alkaline ions chemical reaction and reduce fertilizer efficiency. 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.
Five bogey year after year application of zinc fertilizer has little effect in the year, the second year can give full play to the fertilizer effect, which is what people call "Zinc fertilizer has a aftereffect", so zinc fertilizer does not require consecutive years of application, the general effect of good application every other year.
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