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Determining a reasonable concentration of fertilizer must be based on different growth periods and climatic conditions and different concentrations of tree species. The concentration of young leaves should be low, and the age-old leaves should be high; the areas and seasons with more rainfall can be higher, and vice versa.
The amount of spray should be adequately sprayed, with the leaves moist and not dripping, and the foliar spray fertilizer concentration is generally low, and the fertilizer content is less. In order to improve the spray effect, it is best to spray 2~3 times continuously. Above, the interval is 10~15 days.
Determining the optimum spray site Different nutrients are different in the mobility of the tree. Nitrogen, phosphorus and potassium are extremely mobile elements, followed by sulfur and chlorine. Iron, manganese, zinc, molybdenum, and copper are not easily moved, and boron, magnesium, and calcium are hardly moved. Therefore, the spraying parts should be different, especially the trace elements in the tree body with poor fluidity, it is best to spray directly on the desired organs. In addition, the leaf back absorbs faster than the leaf surface, and the spray back should focus on the leaf back.
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