Dental Anesthesia,Anesthesia Unit,Anesthesia Machine Sofine Electric Co., Ltd. , http://www.sofine-dentistry.com
First, according to fertilizer characteristics, select fertilizer types. Fertilizers that are commonly used for good foliar fertilizers include urea, potassium dihydrogen phosphate, potassium sulfate, potassium chloride, ammonium nitrate, 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.
Second, according to the type of fruit trees and fertilizer purposes, determine the spraying concentration and spray time. Appropriate foliar spraying fertilizer concentration is generally: urea 0.3% -0.5%, potassium dihydrogen phosphate 0.2% -0.3%, ammonium phosphate 0.3% -0.5%, boric acid 0.1% -0.5%, borax 0.1% -0.25%, sulfuric acid Ferrous iron 0.1%-0.4%, plant ash 1%-6%. In order to increase the fruit setting rate of apple, pear, grape and other fruit trees, 0.3%-0.5% urea can be sprayed during flowering and 200 times borax solution can be added. To promote fruit coloring, 0.2% dihydrogen phosphate can be sprayed during fruit expansion. Potassium; In order to improve the nutrient reserve of nitrogen in tree, it can spray 3%-5% of high concentration urea after harvesting fruit 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.
Third, according to climatic conditions, select the appropriate spraying time. Foliar spray fertilizer should enter the ground in relatively humid weather, keep the blade wet time 30-60 minutes, play 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. Fourth, according to the movement of fertilizer in the tree body, determine the frequency of spray fertilizer. The mobility of nitrogen and potassium in the tree is very strong. It can be sprayed once in the 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 is sprayed twice; zinc and copper are only Part of the movement, boron, calcium and other trace elements do not move, should be sprayed 2-3 times in order to receive the expected results.
While spraying foliar fertilizer, pesticides that can be mixed together can also be added, which can save labor and time.
When the fertilizer is applied to the foliage, the solid fertilizer is formulated into an aqueous solution of an appropriate concentration and then sprayed onto the leaf surface to enter the tree body through the epidermal cells and pores 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 nutrient elements, help to prevent deficiency of the disease.