The spraying of fertilizer on the leaves is to spray the fertilizer onto the leaf after it has been formulated into an aqueous solution of suitable concentration, and then enters the tree body through epidermal cells and stomata to exert the fertilizer effect. This method is simple and easy to use, with less fertilizer, play a role quickly, can meet the urgent needs of fruit trees for nutrients, help to correct the lack of disease. Applying foliar fertilizer in fruit trees science can play a multiplier role.
According to fertilizer characteristics, select fertilizer type
Fertilizers that are commonly used for good foliar fertilizers include urea, potassium dihydrogen phosphate, potassium sulfate, ammonium phosphate, superphosphate, and leaching of plant ash, and part of trace fertilizers. Volatile ammonium bicarbonate and other fertilizers should not be used for foliar fertilizers.
Determine spraying concentration and spraying period according to fruit tree type and top dressing purpose
In order to promote fruit coloring, 0.2% of potassium dihydrogen phosphate can be sprayed during the fruit enlargement period; in order to increase the nutrients of the nitrogen reserve of the tree, 3-5% urea solution can be sprayed after fruit is picked in autumn. The concentration of fertilizer solution in the early stage of fruit growth should be low, and it can be appropriately increased in the middle and late stages.
According to weather conditions, choose the right spraying time
Foliar spraying should be performed in relatively humid weather. Keeping the wet time of the leaves from 30 to 60 minutes is the best fertilizer effect. In order to extend the storage time of the fertilizer solution on the leaf surface as much as possible, it is best performed in the morning and evening when the air is moist and when the dew is not dry, and it can be sprayed all day without any windy cloudy weather. If a suitable amount of adhesive is added to the fertilizer solution, the spraying effect can be significantly improved.
According to the movement of fertilizer in the tree body, determine the frequency of fertilizer application
Nitrogen and potassium are highly mobile in the tree body and can be sprayed once at a critical period of fruit tree growth. The mobility of phosphorus is lower than that of nitrogen and potassium. According to the growth of the tree, it must be sprayed twice; zinc and copper are only partially Movement, calcium and other trace elements are difficult to move, should be sprayed 2-3 times in order to receive the desired results.
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