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Second, time: in order to reduce the loss of micro-fertilizer in the spraying process, it is best to choose cloudy spray, sunny day should be sprayed in the evening to extend the wet time of fertilizer on the stems and leaves of the crop as much as possible to absorb .
Third, the amount: the amount of trace elements required for vegetables is small, and the critical range of various trace elements from lack to excess is very narrow, a slight lack or excess may cause harm. Generally, spraying 40-75 kilograms of fertilizer per acre can make the stems and leaves of vegetables evenly wet, avoiding repeated application.
Fourth, the number: according to the growth and development of vegetables, usually 2-4 times.
5. Mixed spraying: reasonable mixing and spraying between micro-fertilizers, or mixed with other fertilizers or pesticides, can play the role of “one spray and multiple effectsâ€, but it is necessary to clarify the physical and chemical properties of fertilizers and pesticides to prevent chemical reactions. And reduce the fat (medicine) effect.
First, the concentration: micro-fertilizer spray concentration is appropriate to receive good results, the concentration is too high, not only beneficial but harmful. Usually, the concentration is boric acid or borax 0.05-0.25%, ammonium molybdate 0.02-0.05%, and copper sulfate 0.01-0.02%. If high concentration is required, it should not exceed 20% of the specified concentration. If the specified concentration is 1%, the highest concentration should not exceed 1.2%.
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