The top-dressing of fruit trees is a commonly used method of supplementing fertilizers in fruit trees. It is often used in conjunction with fruit tree base fertilizers. It has the characteristics of labor saving, fertilizer saving, rapid absorption, economy, and a simple and flexible fertilization method. It has been widely used by farmers. However, the types of fertilizers used in the topdressing process, the concentration of the fertilizer, the time of use, and the spray method directly affect the top dressing effect. In use should pay attention to the following issues:
First, the extra-root fertilizer can only be used as an auxiliary means to supplement the urgent needs of fruit trees for certain periods of nutrients, and it cannot be used as a substitute for soil fertilization.
Second, extra-root dressing should be carried out in the sensitive period of fertilizer application. For example, the new shoot growth period is to use fruit trees for storage and nutrition transition period. Spraying urea can promote the growth of new shoots; flower bud differentiation and fruit enlargement period are due to the overlapping growth of multiple organs, and nutrition. The contradiction between supply and demand is the most prominent. Spraying potassium dihydrogen phosphate or leaching of plant ash in this period is conducive to flower bud differentiation, fruit enlargement and fruit quality improvement. After fruit picking, the leaves gradually enter the aging stage. Spraying urea improves the photosynthetic capacity of the leaves and improves the storage and nutrition of the tree. Level.
Third, the concentration of topdressing fertilizers outside the roots is generally lower. Each time the absorption is small, it often requires continuous spraying more than 2-3 times.
The fourth is that the spray time is better to be kept in the morning after 10 o'clock in the morning and 4 o'clock in the afternoon, or in cloudy days. This can avoid the reduction of fertilizer efficiency caused by the rapid evaporation or concentration of fertilizer solution under high temperature or the occurrence of fertilizer damage. The spray should be sprayed within 12 hours of spraying.
Fifth, spraying should be careful and thoughtful. This is because the fertilizer solution is mainly absorbed through the stomata of the leaves, while the leaf stomata is more than the leaf surface, and the fertilizer is absorbed faster. Therefore, besides the leaf surface, the back of the leaves must be sprayed.
Sixth, foliar spray fertilizer can be combined with spraying but it should be noted that acid and alkali pesticides and fertilizers cannot be mixed to prevent failure.
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