First, the best concentration
Spraying foliar fertilizer to grasp the optimal concentration can achieve a multiplier effect. If the concentration is too high, it is prone to produce fertilizer or toxins; if the concentration is too low, the purpose of fertilization cannot be achieved. The optimum concentration of commonly used fertilizer is urea 0.5-1%, diammonium phosphate 0.2-1%, calcium chloride 0.3-0.5%, and zinc sulfate 0.05-0.2%.
Second, the best period
The most important period for fertility requirements, such as vegetable seedling stage, initial flowering stage or middle or late stage, is the best period for spraying foliar fertilizer. It is better to spray on cloudy or sunny days in the morning and evening. It should be avoided when spraying in the hot sun and spraying in time after the rain.
Third, the best amount
Spray 50-60 kg of fertilizer per acre. Apply as much as possible to increase the atomization of the sprayer. The whole plant sprays, the new leaves and the leaves behind cannot be sprayed. It is advisable that the vegetables are sprayed 2-4 times throughout the growing season.
Fourth, the best part
The effect of foliar dressing is related to the speed of movement of the spraying elements in the plant. Nitrogen, phosphorus, potassium, and sodium are the elements that have strong mobility. All the elements that can move but have low mobility are phosphorus, sulfur, etc. Some of the moving elements are iron, copper, manganese, molybdenum, etc. Fertilizers that do not move or have low mobility are better at spraying on new leaves.
Fifth, the best mixed spray
Mixing sprays of various kinds of foliar fertilizers, or spraying mixed fertilizers and pesticides, can play a role of multiple sprays, but when mixing sprays, the properties of fertilizers and the nature of pesticides should be known. If the nature is opposite, never spray. When preparing the mixed solution, it must be mixed evenly, and it is ready for use. Generally, a fertilizer is first formulated into an aqueous solution, and the other fertilizers are directly added to the prepared fertilizer solution according to the amount, and the solution is sprayed after shaking.
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