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First, the time outside the root dressing
Potted fruit trees require different types of fertilizer during different growth and development periods, and should be properly topdressed according to their needs. Before the leaf is extended to the flowering stage, the nitrogen fertilizer is mainly used, and 0.3% urea solution can be sprayed every 5 days to 7 days, which can effectively promote the vegetative growth, make the branches thick and the leaves are dark green. Phosphorus and potassium fertilizers are mainly used from flowering to fruit development, and 0.2% potassium dihydrogen phosphate solution can be sprayed on the leaves. It can be sprayed once every 5 days to 7 days. It can promote the flowering and fruit development of potted trees, and can also make The branches are enriched to promote flower bud differentiation. In the flowering and young fruit period, spray 1 to 2 times of borax solution from 0.05% to 0.1%, which has the effect of retaining flowers and retaining fruit. If yellowing occurs in the growth period of the fruit tree, 0.1% ferrous sulfate solution can be sprayed on the foliar surface, and sprayed once every 7 days to 10 days until the leaf color turns green.
Second, the method of top dressing
Top dressing mainly refers to foliar spray fertilizer. Since the fertilizer is mainly absorbed through the pores of the leaf epidermis, the external top dressing should be carried out in the morning, evening, rain or cloudy days where the air humidity is high, and the back of the blade is generally sprayed uniformly to improve the absorption effect. Spraying when exposed, the fertilizer concentration can be appropriately increased.
Third, matters needing attention
1. The top dressing should be avoided under high temperature and strong sunshine conditions. At this time, it is not conducive to the absorption of the leaves, and it is easy to burn the leaves and cause fat damage.
2. When the top is topdressed, several fertilizers or fertilizers can be mixed with pesticides, but some fertilizers and medicines cannot be mixed. For example, acidic superphosphate liquid and alkaline grass ash leaching solution cannot be mixed.
3. The combination of top dressing and potting soil fertilization can achieve the desired effect.
Root dressing of potted fruit trees
In order to solve the malnutrition or deficiency of potted fruit trees, the method of root dressing can be adopted as the auxiliary fertilization of soil to supplement the deficiency of root absorption and adjust the tree potential.
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