Foliar fertilization, also known as root top dressing, is a topdressing method that sprays a certain concentration of fertilizer aqueous solution evenly on the leaf surface of the crop and absorbs it through the leaf surface. The application of foliar fertilization is small, the effect is quick, and the soil is prevented from being fixed and invalidated by the fertilizer. It is one of the effective methods for the use of micro-fertilizer, and is also a method for assisting a large number of elements and medium-quantity elements, and an emergency fertilization method. Crops are especially used in the production of fruit trees and vegetables.
Principles for foliar fertilization
First, strict selection of fertilizer varieties: urea is best in nitrogen fertilizer, but the content of biuret in urea can not exceed 0.5%; calcium phosphate is commonly used in phosphate fertilizer; potassium sulfate is commonly used in potassium fertilizer; potassium dihydrogen phosphate is commonly used in phosphorus and potassium compound fertilizer; The compound fertilizer can be used for potassium nitrate; the medium amount element is commonly used for magnesium sulfate; the commonly used varieties in the micro-fertilizer are zinc sulfate, borax, ferrous sulfate, manganese sulfate, ammonium molybdate, copper sulfate and the like.
Second, we must strictly control the concentration of the spray: urea is 0.2% to 2%, the ratio of superphosphate to water is 1:10 times the leaching solution is 0.5% to 2%, potassium sulfate is 2% to 3%, and potassium dihydrogen phosphate is 0.1%. ～0.3%, magnesium sulfate is 01% to 0.2%, zinc sulfate is 0.1% to 0.4%, borax is about 0.2%, ferrous sulfate is 0.2% to 1%, and manganese sulfate is 0.1% to 0.3%. Ammonium molybdate It is 0.02% to 0.1%, and copper sulfate is 0.01% to 0.02%.
The third is to ensure the effective use period, the number of uses and the amount of liquid used: trace elements should be sprayed in the early stage of crop growth. Nitrogen, phosphorus and potassium are generally applied in the middle and late stages and in the event of severe weather. The number of uses depends on the growth of the crop field. The situation is determined, from 1 time to 3 times, and usually 3 times every 7 days. Each time the amount of liquid is used, the amount of liquid is just about to appear on the leaf surface.
The fourth is to choose the best timing for application: no wind, no sun exposure, uniform spraying, in order to keep the fertilizer liquid on the leaf surface for a long time to ensure that the fertilizer is fully absorbed.
Foliar fertilization can be mixed with pesticides for controlling pests and diseases, and should be strictly followed. It should not be mixed at will. This is a problem that must be paid attention to in foliar fertilization.
Total 1 | <First <Prev 1 Next> Last> |
share to:
Pull Down Faucets,Pull Down Faucets Price,pull down kitchen faucet
Yuyao Zelin Sanitary Ware Co., Ltd , https://www.kitchen-sinkfaucets.com