It was determined that the most suitable spray site was different in the mobility of different nutrient elements. Nitrogen, phosphorus, and potassium were highly mobile elements, followed by sulfur and chlorine. Iron, manganese, zinc, molybdenum, and copper, which hardly move, hardly move, are boron, magnesium, and calcium. Therefore, the spraying site should be different, especially the trace elements in the tree body fluidity is poor, it is best to spray directly on the desired organ. In addition, the leaf back absorbs more quickly than the leaf surface, and the spraying of fertilizer should focus on spraying the leaf back.
Determining a reasonable spray fertilizer concentration 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 mature leaves should be high; areas and seasons with more rainfall can be higher, and vice versa.
The amount of spray should be adequate to spray, leaf moist, no drops for the degree, while the foliar spray fertilizer concentration is generally lower, less fertilizer, in order to improve the spray effect, the best continuous spraying 2 to 3 times Above, interval 10~15 days.
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