In grape production, there are many measures to promote the fruit to be sweet and large, such as applying multiple farmyard fertilizers, girdling, and treating the ears with gibberellic acid to increase the size of the fruit, spraying the vinegar and rare earth fertilizers according to the concentration requirements and period. Potash can increase fruit sweetness. "Long leaf nitrogen phosphorus long fruit, potassium is nothing long firewood." This sentence spreads for decades of farming language, meaning that crops in the growth phase requires the role of fertilizer nutrients, potassium fertilizer is mainly to make the straw, stems become stout . Because of the "mother's son fat," as far as the grape production is concerned, as long as the plants grow vigorously and stoutly, the result volume is large and the fruit size is large. Grape is a kind of fruit tree with pleasant potassium, which is called "potassium fruit tree". The main scientific basis is threefold: First, for every 100 grams of grape berries produced, 0.25-0.75 grams of pure nitrogen, 0.25-0.75 grams of phosphorus, and 0.35-1.1 grams of potassium are required, which is significantly higher than other fruit trees; second, the demand for potassium by grapes exceeds that of nitrogen. Phosphorus requires more potassium throughout the growing season, especially from the inflorescence separation stage to the ripening of berries. The absorption of nitrogen was the highest before flowering and the flowering period. The absorption of phosphorus was most separated from the inflorescence to the flowering stage; the third was the increase of 12.5%-16.8% of the potassium-free yield in the case of potassium deficiency. The sugar content increased from 13.4% to 17.8%, and the coloration was good. The weight of single fruit increased significantly. At the same time, the main diseases of grapes such as anthracnose and blackpox were significantly inhibited. In the growing season of grapes, in order to save labor, the application of potash fertilizer is mainly combined with the prevention and control of pests and diseases, and it is carried out simultaneously with the method of spraying fertilizers outside the roots (foliar application of fertilizers), and has many advantages such as rapid absorption, good fertilizer effect, and timely supply. But pay attention to the following seven aspects: 1. Select the type of potash fertilizer. Practice has proved that the application of potassium fertilizer outside the grape roots, potassium dihydrogen phosphate, potassium sulfate, high-quality plant ash leaching liquid and other available potassium fertilizer. In the production of grapes, due to the "strong penetration of chloride ions, which can cause poisoning in a large number of plants, and can reduce the sugar content of fruits and reduce fruit quality," it is not appropriate to use potassium chloride. 2. Determine the application time. According to the characteristics of the “potassium in the late nitrogen of phosphorus in the former nitrogen†of the grape, the potassium sprayed from the root of the grape is mainly carried out in the later growth stage of berry enlargement and berry ripening. Plants that thrive can also be sprayed when young fruit begins to grow after 10-15 days of flowering. When spraying potassium fertilizer, it is necessary to apply nitrogen and phosphorus fertilizers in order to ensure that potassium fertilizer can normally exert its fertilizer efficiency and lack of nutrients. 3. The quasi-spray concentration. Potassium dihydrogen phosphate is preferably 0.5%-0.85%, and potassium sulfate is 0.8%-1.0%. The leaching solution of grass ash (soaked in water for 24 hours) is suitable for 3%-5%. The concentration should not be too large to avoid fertilizer damage. . 4. Select spray time. To ensure fertilizer effect and effect, potassium fertilizer should be sprayed on the cloudy day (all days) or on the sunny day before 9:00 and after 5:00 pm. It should not be sprayed at high temperature in the noon. 5. Add adhesives. In the fertilizer solution, add a trace amount of neutral detergent, etc. as an adhesive to maximize the time for the fertilizer solution to stay on the foliage to ensure that the leaves are fully absorbed and the fertilizer efficiency is improved. 6. Pay attention to spraying techniques. To spray potassium fertilizer outside the roots of grapes, to achieve the "shower-type" degree and effect, the front and back of the blade should be sprayed evenly. It is better to spray 60 kg per mu. 7. Other potassium application routes. After the grapes are harvested, combined with the autumn base fertilizer (the best time is to use the annual fertilization on the September 23rd of the Gregorian calendar for the best time. This is the second peak of the root growth, the soil temperature is high, which is good for absorption and utilization, and Cut roots will grow more fibrous roots. Apply appropriate amount of potash fertilizer, accounting for 30%-35% of the total amount of potash fertilizer in the whole year. COVID-19 Coronavirus Rapid Test Kit Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesias.com