Grape leaf spray fertilizer to talk about science

When the grapes are sprayed with foliar fertilizer, what fertilizer is sprayed, and how much concentration is sprayed, there are scientific reasons. For example, young fruit and spraying of phosphate fertilizer during ripening period can increase disease resistance and increase sugar content. Before spraying berry, potassium fertilizer increases production by 7%-10%, sugar content increases by 1.5%-2.5%, and berries begin to change. The application of rare earth micro-fertilizer in soft period increased production by more than 10% and sugar content increased by about 0.6%, as follows. First, the leaf application period. Foliar spray can be applied throughout the growing season. It is advisable to spray the tipping fertilizer in the early stage of the shoot growth; to spray the stabilizing fruit fertilizer during the flowering period; to apply the strong fruit fertilizer during the fruit expansion period; and to spray the Zhuangshu manure under the fruit. In addition, if there is a deficiency in the growth and development period, the disease should be remedied in time. Second, suitable fertilizer and spraying concentration. Commonly used nitrogen fertilizers are 0.3%-0.5% ammonium sulfate solution and ammonium nitrate solution. Phosphorus fertilizer has 2%-5% of superphosphate soaked filtrate. Potassium fertilizer has 0.4%-0.5% potassium sulfate solution and 1% potassium nitrate solution. Phosphate-potassium compound fertilizer has a common concentration of 0.2%-0.3% potassium dihydrogen phosphate. Grass ash is also a good potassium fertilizer, spray 3% leachate. Microelement fertilizers include 0.1%-0.2% boric acid or borax, 0.05%-0.15% zinc sulfate, 0.1% ferrous sulfate, 0.1% magnesium sulfate, 0.05%-0.1% manganese sulfate, 0.05%-0.1% rare earth The rare earth nitrate solution and so on. Third, spray the weather and time. Foliar spraying is often affected by wind, temperature, and humidity. In a suitable range, the higher the temperature, the faster the blade absorbs; the higher the humidity, the more the absorption; the smaller the wind speed, the longer the time the fertilizer liquid stays on the blade, and the more absorption and the smaller loss. Therefore, spray fertilizer should be selected in the absence of windy cloudy days or sunny days in the morning or evening when the temperature is suitable (18-25°C), humidity is high, and evaporation is small. Fourth, spray fertilizer method. The stratum corneum is thinner than the old leaves, and the fertilizer solution is easy to infiltrate. There are many stomata on the back of the leaves and the absorption is also fast. Therefore, the grape spray fertilizer should be based on young shoots, young leaves and the back of the leaves, when spraying, strive to fine particles of fog, spray to the leaves all wet, fat drops without falling. Daejeon grapes are commonly used with knapsack sprayers and misters. Overhead grapes are sprayed with a high pressure sprayer. Usually spray 4-6 times in the annual growth cycle, according to the need for a variety of fertilizer spray mixing, can also be mixed with pesticides (including plant growth regulators).

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