Fertilizer should be reasonable
Before flowering, in the young fruit stage, during the expansion period, the grape spleen can be sprayed in time to match the nutrition, so that the grape fruit pedicle (the position of the fruit handle) becomes thick and strong, and the transport passage is widened, so that the nutrient and water of the fruit tree body can be saturated to supply the flesh. Developmental expansion is needed.
Fertilization at flowering stage should be based on phosphate fertilizer, with boron, zinc, iron and other trace elements. When the length of new shoots is appropriate, the leaves should be less or not applied with nitrogen fertilizer. Otherwise, appropriate amount of nitrogen fertilizer should be applied. The coloring period is mainly phosphorus and potassium fertilizer. After harvesting the fruit, the appropriate amount of nitrogen, phosphorus and potassium ternary compound fertilizer is applied to promote the early recovery of fruit trees and avoid premature aging. Grapes are fruit trees with more potassium. Potassium sulfate is better when potassium fertilizer is applied. In practice, it has been confirmed that the application of potassium chloride results in a thick skin, and the aftertaste has a ramie feeling, and potassium chloride should be applied as little or as little as possible.
Irrigation must be appropriate
Pre-flowering combined with fertilization for proper irrigation is an effective measure to increase the fruit setting rate, but the amount of irrigation should be appropriate and appropriate. Irrigation before flowering will inhibit the increase of soil temperature, affect root activity, and reduce the absorption of fertilizer by roots. Therefore, the soil is not very dry at this time, generally do not carry out irrigation; when the soil is dry, the irrigation amount should not be too large. During this period, the growth and development of the leaves are accelerated, and the demand for trace element iron is more. The irrigation reduces the soil temperature, 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, easy to cause disease. If it is true that the temperature is high, the soil is dry and severe drought requires irrigation, it is best to adopt the method of watering by alternate means, the irrigation amount should not be flooded, to prevent the humidity of the garden from being too high and increase the probability of disease infestation.
Deep application and shallow application
According to the different fertilizer types, grape fertilization can be applied by deep application or shallow application. Chemical fertilizer has the characteristics of quick decomposition, easy absorption, and also volatile. The growth period is in the range of 0.8 to 1 meter from the grape vine. The ditch is applied and the soil is covered afterwards. In the winter tree body dormancy period, the farmer's fertilizer is combined with the topsoil to mix the fertilizer with the topsoil, change the ditch and apply the farmyard manure, the concentration is large, the decomposition is slow, the roots stretch and hit the wall, sometimes it is easy to cause the root burning defects, and the application can be improved. The deepening traits of the topsoil make the soil fluffy, reduce the knot and improve the drought resistance of the plants.
High temperature fertilization must be watered
The application of quick-acting phosphorus and potassium fertilizer in the early stage of fruit ripening can not only improve the fruit quality, but also strengthen the tree's disease resistance. However, the climate is usually monotonous, the temperature is high, and the soil is not good. If the water is not timely after fertilization, the soil is insufficient due to soil moisture. The absorbed fertilizer has a large concentration, and it is easy to emerge after the fertilization. The leaf edge is scorched, showing the symptoms of salt damage, impairing the function of the leaves, affecting photosynthesis, and then affecting the fruit quality, and the disease resistance of the leaves is decreased.
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