1. Concentration
Appropriate concentration can receive good results. If the application concentration is too high, it is not only useless but harmful. Under normal circumstances, the appropriate spraying concentration of various fertilizers are as follows: boric acid or borax solution 0.05% ~ 0.25%; ammonium molybdate solution 0.02% ~ 0.05%; zinc sulfate solution 0.05% ~ 0.2%; copper sulfate solution 0.01% ~ 0.02%; ferrous sulfate solution 0.2% to 1%. If you really need a high concentration, do not exceed 20% of the specified concentration.
2. Period
The period of spraying fertilizer must be determined according to different vegetable varieties and different types of micro-fertilizers, and it is generally appropriate to spray before flowering.
3. Dosage
The amount of trace elements required for vegetable crops is very small, and various trace elements are very narrow from the missing to the excessive critical areas. A slight lack or excessive amount can cause damage. Therefore, it should be applied with dignity in accordance with the standard amount. Reduce the amount. The amount of sprayed fertilizer should vary according to the growth conditions. General 40-75 kilograms of mu fertilizer solution, which can wet the stems and leaves of vegetables to avoid repeated use
4. Times
Foliar spray application of fertilizer is less, so it is difficult to meet the needs of the entire growth and development process. Therefore, it should be based on the length of the growing period of vegetables, spraying 2 to 4 times is appropriate.
5. Time
Spraying should be done on a cloudy or sunny day from afternoon to evening. This can extend the residence time of the fertilizer solution on the leaves of the vegetables and help to improve the spraying effect.
6. Mixed spray
Reasonable mixing and spraying between trace fertilizers or mixed spraying with other fertilizers or pesticides can play a role of multiple effects. All kinds of trace element fertilizers are not allowed to be mixed with alkaline fertilizers such as grass ash and lime. For example, zinc fertilizers must not be mixed with superphosphate; copper fertilizers must not be mixed with potassium dihydrogen phosphate solutions. When spraying with pesticides, consider the dual effects of fertilizer efficiency and drug efficacy. For prudent reasons, the micro fertilizer and the pesticide should be placed in the same container before the mixture is mixed. If there is no turbidity, precipitation, and bubbles, then it can be mixed; if any of the above phenomena, it shows that Can not be mixed use. In general, all kinds of micro fertilizers should not be mixed with alkaline pesticides. When preparing a mixed solution, it is usually first formulated with a micro-fertilizer into an aqueous solution, and then the other drugs and fertilizers are directly added to the prepared micro-manure solution to dissolve.
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