Continuous rainfall, most fruit trees are in a period of long fruit and flower bud differentiation and advance, nutrient consumption is large. At this time, soil fertilization is difficult to operate, and only foliar fertilization is needed to supplement nutrition to meet the needs of fruit trees.
Fertilizer should be added with additives. The leaves of fruit trees have a layer of cuticles of different thickness, which makes it difficult to penetrate the solution. You can add an appropriate amount of wetting agent (neutral soap, good quality detergent, etc.) to the foliar fertilizer solution to improve the effect of foliar fertilizer. .
Choose a suitable spraying time. Foliar spraying should not be carried out at high temperature, and it can be sprayed throughout the day on a cloudy day without wind; sunny days should be sprayed before 10 am and after 5 pm.
There must be a sufficient amount of spraying. The amount of foliar fertilizer solution absorbed by fruit trees is proportional to the amount of spraying. The appropriate amount of spraying is that the fertilizer solution will reach the state of dripping and not dripping on the leaves.
The spraying concentration should be reasonable. Under the premise of no fertilizer damage, increase the concentration of foliar fertilizer application. This not only meets the nutrient requirements of fruit trees, but the higher the concentration, the faster it enters the leaves. At the same time, the appropriate concentration should be used according to the weather and the growth of fruit trees, generally urea 0.3%-0.5%, superphosphate 0.5%-1.2%.
Focus on spraying the back of the leaves. Nutrients are absorbed into the fruit tree through the stomata of the leaf. The stomata of the leaf are mainly on the back of the leaf. Therefore, when spraying fertilizer on the leaf, the back of the leaf is mainly sprayed. At the same time, the amount of spraying should not be too large, and it is advisable not to drip the leaves to prevent the accumulation of fertilizer solution and the tip of the leaf to produce fat burning tips.
Fertilize symptomatically. Depends on the growth of fruit trees sprayed with foliar fertilizer. If the fruit tree is weak, the branches and leaves are elongated slowly, and the leaves are yellow or light yellow, this indicates that the fruit tree is deficient in nitrogen and iron. Spraying nitrogen fertilizer should be the main method, and ferrous sulfate, phosphate fertilizer, and potassium fertilizer should be sprayed appropriately. If the leaves are large and green, and the internodes are too long, it indicates that the nitrogen fertilizer is sufficient. Spraying phosphorus and potassium fertilizers should be the main method, and some trace elements should be sprayed appropriately. For trace elements, foliar fertilization is the main method, and its effect is better than soil fertilization.
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