The spraying of foliar fertilizers reaches the optimal concentration to achieve a multiplier effect. If the concentration is too high, it will be prone to produce fertilizer or toxins; if the concentration is too low, the purpose of topdressing will not be achieved. Foliar fertilizer on the market has a clear use concentration suitable for control, the other common fertilizer optimum concentration of urea 0.5% -1%, 0.2% -1% diammonium phosphate, calcium chloride 0.3% -0.5%, zinc sulfate 0.05 %-0.2%.
In the best period, the best effect is usually achieved when the foliar fertilizer is sprayed at the seedling stage, the initial flowering stage, or the critical period of the middle and later stages of fertilizer application. Selecting a cloudy or sunny day in the morning and early evening spraying is effective, avoiding the sun burning, causing a large amount of transpiration on the leaves to cause poisoning, and timely spraying after the rain.
The best dosage is 50-60 kilograms of fertilizer solution sprayed per acre, and the sprayer's atomization should be increased as much as possible. Whole plant spraying, new leaves and foliage behind can not be sprayed. It is advisable that the vegetables are sprayed 2-4 times throughout the growing season.
The effect of top dressing on the best part of the leaf surface is related to the speed of movement of the spraying elements in the plant. Nitrogen, potassium, sodium, etc. are the most mobile elements. All the elements that can move but are not strong are phosphorus and sulfur. And so on, some of the moving elements are iron, copper, manganese, molybdenum, and so on. Fertilizers that do not move or have low mobility are good for spraying on new leaves.
The best mixed spray of mixed spraying of various kinds of foliar fertilizers, or mixed spraying of fertilizers and pesticides, can play a role of a multi-effect spray, but when mixing spray should first understand the nature of fertilizers and pesticides. If the nature is opposite, never spray. When preparing the mixed spray solution, it must be mixed evenly, and the existing ones should be prepared. Generally, one kind of fertilizer is first formulated into an aqueous solution, and then the other fertilizers are directly added into the prepared fertilizer solution according to the amount, and the solution is sprayed after shaking.
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