A bogey blind application. Zinc-deficient land and zinc-sensitive crops are only effective when applied with zinc fertilizers. Therefore, the application of zinc fertilizers should vary from place to place and vary from crop to crop, and should not be applied blindly. In general, when the effective zinc content in the soil is lower than 0.5 mg/kg, the effect of zinc fertilizer application is significant. When the effective zinc content in the soil is higher than 1 mg/kg, the basic yield of 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. Zinc fertilizer is micro-fertilizer, and the crop needs less for it. The application amount exceeds the General Assembly and has a toxic effect on crops. When zinc fertilizer is used as base fertilizer, according to the different degree of soil zinc deficiency, the general application of zinc sulfate 0.5 ~ 2 kg per mu; for top dressing, zinc sulfate applied per acre 0.75 ~ 1 kg, with appropriate amount of fine soil applicator; root spray, Applying 90-180 grams of zinc sulfate per mu to 60 kg of water in sunny days.
Three bogey and phosphate fertilizer application. The combination of zinc and phosphate fertilizers is easy to form zinc phosphate precipitates, not only reduce the effectiveness of zinc fertilizer, but also reduce the effectiveness of phosphate fertilizers.
Four bogey and alkaline fertilizers, pesticides mixed. The zinc fertilizer is mixed with alkaline fertilizers such as lime, grass ash and ammonia, and the acidic ions react with alkaline ions to reduce the fertilizer effect. 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 avoid consecutive years of application. After the application of zinc fertilizer was little effective in the year, can fully exert the fertilizer effect in the second year. This is what people call “post-effect of zinc fertilizerâ€. Therefore, zinc fertilizer does not need to be used year after year. Generally, the effect of application is good every other year.
The bearing structure, fixed film systems and installation of this greenhouse is relatively simple. And due to it, raw material and manufacturing costs are affordable. Except the high strength woven film is higher, other kinds of antidrop film are economical. In general, the comprehensive cost of film greenhouse is lower 30% ~ 50% than the same size and specifications of the other types of greenhouse.
Single Span Greenhouse,Greenhouse Film,Tunnel Greenhouse,Plastic Film Greenhouse
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.skyplantgreenhouse.com