How to apply foliar fertilizer in grape planting?

How to apply foliar fertilizer in grape planting? Please introduce the main advantages of foliar fertilization: rapid fertilizer effect, remarkable effect, saving labor and fertilizer, not affected by soil fixation and root absorption function. The disadvantage is that it is greatly affected by wind, air humidity and temperature. Foliar fertilization can not only treat the deficiency of fruit trees in time, but also play a significant role in promoting leaf growth, prolonging leaf functional period and improving photosynthetic efficiency. First, the period of fertilization and the type and concentration of fertilizer 1. After germination, before flowering: mainly to promote the growth of leaves and shoots, mainly by spraying nitrogen fertilizer. For example: 0.3% Mel 0.5% urea solution, 0.3% Mel 0.5% ammonium sulfate solution, 0.3% Mel 0.5% ammonium nitrate solution, 0.3% urea + 0.3% potassium dihydrogen phosphate nitrogen, phosphorus and potassium compound liquid fertilizer. 2. Flowering and fruiting period: the main purpose is to promote flowering and fruit setting rate. 0.1% color 0.3% borax solution or 0.05% color 0.15% boric acid solution can be sprayed 5-7 days before flowering, 0.05% color 0.2% zinc sulfate solution is sprayed once a week before flowering and a week after flowering, and 0.03% UV 0.07% rare earth microfertilizer can be sprayed once during flowering and 0.07% after flowering. 3. After fruit setting, before ripening and branch ripening period: mainly to promote fruit growth, increase fruit sugar content, prevent fruit and "water irrigation", promote photosynthesis, prolong leaf life, promote branch ripening and improve plant disease resistance. In this period, the extra-root topdressing was mainly phosphorus and potassium fertilizer, combined with nitrogen fertilizer. Second, the preparation of the leaching solution 1. Calcium superphosphate leaching solution: take 1 kg of calcium superphosphate plus 5 kg of clear water, soak for 12 hours to filter the liquid. When in use, 2% of the leaching solution can be obtained by mixing 50 kg of filtrate with water. 2. Plant ash leaching solution: take 1 kg of plant ash to 5 kg of clear water, soak for 24 hours to filter the liquid. When in use, 2% of the leaching solution can be obtained by mixing 50 kg of filtrate with water. 3. Potassium dihydrogen phosphate leaching solution: 5.5 kg fresh plant ash was mixed with 2.5 kg calcium superphosphate, mixed with 45 kg water, the filtered extract was soaked for about 24 hours, the residue was added with 25 kg water, and the filtered extract was soaked for 10 hours. Mix the filtrate twice and spray the leaf surface with 100 kg of water. 4. Nitrogen and phosphorus mixture: one method is. Take 1 kg of calcium superphosphate and 5 kg of clear water, soak for 12 hours to filter the liquid, and add 2 kg of urea to the filtrate to form the original solution. When in use, 50 kg of raw liquid is sprayed with water. Another method is to take 1 kg of fully mature human feces and urine supernatant and spray it with 50 kg of water. 3. Foliar fertilization time foliar fertilization should be carried out before 10:00 or after 5pm on windless cloudy or sunny days. The interval between two times of foliar topdressing is generally about 15 days. Matters needing attention 1. Because in a certain range, the higher the temperature, the greater the humidity, and the smaller the wind speed, the faster and more the leaves will absorb, so the spray concentration should be reduced when there is thick fog or dew. Strong wind and high temperature are not suitable for the weather. 2. Mainly spray tender leaves, young shoots and the back of leaves. 3. When spraying, the fog droplets should be fine and uniform, and it is better for the fertilizer liquid to drop without falling. 4. When many kinds of fertilizers are mixed and sprayed, attention should be paid to the properties of fertilizers and should not be blindly mixed. 5. Spray again in case of rain within 12 hours after spraying. Click to get more foliar fertilizer application methods click to get more fertilizer application methods click to get more grape planting techniques