First, according to the characteristics of fertilizers, the fertilizer types are often used for fertilizers with good foliar fertilizers, such as urea, potassium dihydrogen phosphate, potassium sulfate, ammonium phosphate, superphosphate and grass ash leaching solution and some micro-fertilizers. Fertilizers such as ammonium bicarbonate should not be used as dry fertilizer.
Second, according to the type of fruit trees and the purpose of topdressing, determine the appropriate concentration of foliar spray fertilizer for spraying concentration and spraying period: urea 0.3%-0.5%, potassium dihydrogen phosphate 0.2%-0.3%, ammonium phosphate 0.3%-0.5 %, borax 0.1%-0.25%, ferrous sulfate 0.1%-0.4%, and ash ash 1%-6%. In order to increase the fruit setting rate of apples, pears, grapes, etc., 0.3%-0.5% urea can be sprayed at the flowering stage and 200 times of borax solution can be added; in order to promote fruit coloring, 0.2% potassium dihydrogen phosphate can be sprayed during the fruit expansion period. The concentration of fertilizer in the early stage of fruit growth should be low, and it can be appropriately increased in the middle and late stages.
Third, according to the climatic conditions, choose the appropriate spraying time foliar spray fertilizer should be carried out in relatively humid weather, keep the leaf wet time 30-60 minutes, the best fertilizer effect. In order to extend the storage time of the fertilizer on the leaf surface as much as possible, it is best when the air is wet in the morning and evening and the dew is not dry. The windless cloudy sky can be sprayed all day. If an appropriate amount of adhesive is added to the fertilizer solution, the spraying effect can be significantly improved.
4. According to the movement of fertilizer in the tree body, determine the number of spraying fertilizer. The mobility of nitrogen and potassium in the tree body is very strong, and it can be sprayed once in the critical period of fruit tree growth; the mobility of phosphorus is inferior to nitrogen and potassium. According to the growth of the tree, it is sprayed twice; zinc and copper only partially move, and elements such as boron and calcium are difficult to move. It should be sprayed 2-3 times continuously to receive the expected effect.
At the same time as spraying the foliar fertilizer, it is also possible to add a pesticide that can be mixed and sprayed, which saves labor and time.
Source: Shaanxi Science and Technology News Author: Sun Yude
Second, according to the type of fruit trees and the purpose of topdressing, determine the appropriate concentration of foliar spray fertilizer for spraying concentration and spraying period: urea 0.3%-0.5%, potassium dihydrogen phosphate 0.2%-0.3%, ammonium phosphate 0.3%-0.5 %, borax 0.1%-0.25%, ferrous sulfate 0.1%-0.4%, and ash ash 1%-6%. In order to increase the fruit setting rate of apples, pears, grapes, etc., 0.3%-0.5% urea can be sprayed at the flowering stage and 200 times of borax solution can be added; in order to promote fruit coloring, 0.2% potassium dihydrogen phosphate can be sprayed during the fruit expansion period. The concentration of fertilizer in the early stage of fruit growth should be low, and it can be appropriately increased in the middle and late stages.
Third, according to the climatic conditions, choose the appropriate spraying time foliar spray fertilizer should be carried out in relatively humid weather, keep the leaf wet time 30-60 minutes, the best fertilizer effect. In order to extend the storage time of the fertilizer on the leaf surface as much as possible, it is best when the air is wet in the morning and evening and the dew is not dry. The windless cloudy sky can be sprayed all day. If an appropriate amount of adhesive is added to the fertilizer solution, the spraying effect can be significantly improved.
4. According to the movement of fertilizer in the tree body, determine the number of spraying fertilizer. The mobility of nitrogen and potassium in the tree body is very strong, and it can be sprayed once in the critical period of fruit tree growth; the mobility of phosphorus is inferior to nitrogen and potassium. According to the growth of the tree, it is sprayed twice; zinc and copper only partially move, and elements such as boron and calcium are difficult to move. It should be sprayed 2-3 times continuously to receive the expected effect.
At the same time as spraying the foliar fertilizer, it is also possible to add a pesticide that can be mixed and sprayed, which saves labor and time.
Source: Shaanxi Science and Technology News Author: Sun Yude
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