Application skills of Grape foliar Fertilizer

When the grape is sprayed with foliar fertilizer, the leaves receive a wide range of fertilizer, rapid fertilizer effect, labor-saving and fertilizer-saving, which is a common fertilization method for grapes. Generally, the fertilizer solution is absorbed 2 hours after spraying, and the urea solution can be absorbed 88% within 24 hours after spraying. Spraying 0.2%-0.3% urea solution at flowering stage and adding 0.1% boric acid or borax or multi-element boron fertilizer mixture can increase the fruit setting rate; spraying calcium superphosphate solution during the ripening period of young fruits and berries can significantly increase the sugar content of the fruit and enhance the disease resistance. when potassium fertilizer is sprayed during berry growth, the yield can be increased by 7% 10%, and the sugar content can be increased by 1.5% 2.5%. Spraying rare earth aqueous solution at the initial stage of berry softening increased yield and sweetness. In order to achieve the best effect of foliar fertilizer spraying, the following technical points should be mastered: 1. Generally speaking, foliar fertilizer can be applied in the whole growing season of grapes, it is best to spray "shoot-promoting fertilizer" before new shoot growth, "stable flower and stable fruit fertilizer" is sprayed during flowering and fruit setting period, and "strong fruit fertilizer" is sprayed during fruit expansion period. in the whole process of growth and development, when deficiency occurs, it should be remedied by spraying fertilizer in time. As far as fertilizer varieties are concerned, it is suitable to spray nitrogen fertilizer from sprouting and leaf expansion to before and after flowering; from new shoot growth in spring to berry ripening stage, especially from new shoot flourishing stage to berry expansion stage, the effect of spraying phosphate fertilizer is the best; spraying potassium fertilizer is the best in berry expansion stage; boron spraying effect is good at flowering stage; spraying rare earth fertilizer plays an important role in the initial stage of berry softening. two。 Suitable fertilizers and commonly used nitrogen fertilizers are 0.2%-0.4% urea solution, 0.3%-0.5% ammonium sulfate and ammonium nitrate aqueous solution, 2%-0.5% calcium superphosphate immersion filtrate for phosphate fertilizer, 0.4%-0.5% potassium sulfate aqueous solution and 1% potassium nitrate aqueous solution, and potassium dihydrogen phosphate is a potassium phosphate compound fertilizer with a spraying concentration of 0.2% 0.3%. Plant ash is also a good potash fertilizer, generally spraying 3% of the leaching solution. Trace element fertilizers have 0.1%-0.2% borax or boric acid or multi-element boron fertilizer aqueous solution, 0.05%-0.15% zinc sulfate solution, 0.1% ferrous sulfate solution, 0.1% magnesium sulfate solution, 0.05%-0.1% manganese sulfate solution, rare earth is 0.05%-0.1% rare earth nitrate aqueous solution. 3. The weather and time of foliar fertilizer spraying are affected by wind, air temperature and humidity. In a certain range, the higher the temperature is, the faster the leaf absorbs fertilizer; the higher the humidity is, the more fertilizer is absorbed; the smaller the wind speed is, the longer the wet time of fertilizer liquid on the leaf is, so the more fertilizer is absorbed and the smaller the drift loss is. In order to improve the effect of fertilizer spraying, it is best to spray in cloudy days without wind, and in sunny days in the evening or in the morning with suitable temperature (18-25 ℃), higher humidity and less evaporation. 4. In the method of spraying fertilizer, the cuticular layer of the tender leaves of grape is thinner than that of the old leaves, and the infiltration of fertilizer liquid is larger; the stomata on the back of the leaves are more than those on the front, and the absorption is faster. Therefore, grape fertilizer spraying should be based on tender shoots, young leaves and leaves. Spray fertilizer to strive for fine fog particles, in order to facilitate uniform and dense distribution, spray to the leaves all wet, fertilizer liquid to drop but not fall for the degree. Field grapes are carried out with knapsack sprayers and sprayers, and elevated grapes are sprayed and sprayed with high pressure. It is generally sprayed 4 times in the annual growth and development cycle. It can be sprayed with a variety of nutrients as needed, or with fungicides or pesticides (including plant growth regulators). In order to facilitate the adhesion of the fertilizer liquid to the leaf surface, 0.1%-0.2% neutral detergent can be added to the fertilizer solution as an adhesive.