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Second, pre-flowering irrigation should not be combined with fertilization before flowering is an effective measure to improve the fruit setting rate. The amount of irrigation should be appropriate. Even if it is dry before flowering, the temperature is relatively high, but the soil temperature is relatively low. After irrigation, the soil temperature is increased, which affects the root activity and reduces the absorption of fertilizer by the root system. Therefore, the irrigation amount should not be too large. Therefore, the growth and development of the leaves are accelerated, and the demand for trace element iron is high. The irrigation makes the soil temperature too low, the absorption of iron is blocked, and the yellowing of the leaves is prone to occur, showing symptoms of iron deficiency. At the same time, too much irrigation, resulting in increased humidity in the field. If it is true that the temperature is high and the soil is in need of irrigation, it is best to adopt an interlaced watering method to effectively reduce the temperature in the garden and reduce the probability of infection.
Third, high temperature deficiency, careful fertilization, fruit application of quick-acting phosphorus and potassium fertilizer can improve the fruit quality and enhance the disease resistance of the tree. However, the climate in this period is generally dry and the temperature is high, and the soil is not good. If the irrigation is not timely after fertilization, due to the lack of soil moisture, the concentration of fertilizer absorbed by the roots is large, and the leaf edge is easy to appear after fertilization, showing symptoms of salt damage. Impaired leaf function, affecting photosynthesis, and thus affecting fruit quality. At the same time, the disease resistance of the leaves is reduced. If it is rainy in the later stage, the disease of the leaves will be serious and even cause the leaves to fall early. Fertilization should be applied at the right time when the soil is not sticky after irrigation, or timely watering after fertilization.
Fourth, the fertilizer should be suitable for flowering fertilization should be based on phosphate fertilizer, with boron, zinc, iron and other trace elements, when the length of the new shoots is appropriate, the leaves should be less or no nitrogen fertilizer when the leaves are green. On the contrary, it should be combined with the application of an appropriate amount of nitrogen fertilizer. The fruit coloring period is mainly phosphorus and potassium fertilizer. After the fruit is harvested, an appropriate amount of NPK compound fertilizer is applied to promote the early recovery of the fruit tree function and prevent premature aging. Grapes are fruit trees that require more potassium. Potassium sulfate is preferred when applying potassium fertilizer. Practice has proved that the application of potassium chloride has a thick skin and a tingling sensation. Potassium chloride should be applied as little or as little as possible.
Four points of grape fertilizer management
1. Combination of deep application and shallow application Grape fertilization can be applied by deep application or shallow application depending on the type of fertilizer. Chemical fertilizers have the characteristics of rapid decomposition, easy absorption, and also volatile. The growth period is spread within a range of 0.8-1 m from the main vine, and then covered with soil. The farmer's fertilizer is dormant in the winter, and the fertilizer is mixed with the topsoil in combination with the garden. Changing the ditch farmer's fertilizer concentration is large, the decomposition is slow, the root system is blocked, and sometimes it is easy to cause the disadvantage of burning root. The application can also improve the deepening traits of the topsoil, loosen the soil, reduce the knot and improve the drought resistance of the plants.
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