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Concentration: The concentration is suitable to receive a good fertilization effect, and the application concentration is too high, which is not only useless, but harmful. Suitable spraying concentrations of various micro-fertilizers are: boric acid or borax solution 0.05% to 0.25%; ammonium molybdate solution 0.02% to 0.05%; zinc sulfate solution 0.05% to 0.2%; copper sulfate solution 0.01% to 0.02%; sulfuric acid The iron solution is 0.2% to 1%.
Period: The period of spraying micro-fertilizer must be determined according to different vegetable varieties and different micro-fertilizer varieties, and it is generally appropriate to spray at the time of flowering.
Dosage: 40-70 kg of fertilizing liquid in general, so that the stems and leaves of vegetables should be wet.
Number of times: The amount of fertilizer used in the blade is generally small, so it is difficult to meet the needs of all growth and development processes at one time. Therefore, it is generally appropriate to spray 2 to 4 times according to the length of the vegetable growth period.
Time: In order to reduce the loss of micro-fertilizer during spraying, it is beneficial to absorb the leaves. It should be sprayed in the afternoon or evening in cloudy or sunny days, which can prolong the residence time of fertilizer solution on vegetable leaves, which is beneficial to increase the spraying time. Apply the effect.
In addition, when mixing with pesticides, the dual effects of fertilizer efficiency and efficacy should be considered.
Generally speaking, all kinds of micro-fertilizers cannot be mixed with alkaline pesticides. When preparing the mixed spraying solution, a micro-fertilizer is first formulated into an aqueous solution, and then other drugs and fertilizers are directly added to the prepared micro-fertilizer solution for dissolution.
Greenhouse Vegetable Spraying Tips
Fertilizing greenhouse vegetables Try to dilute the micro-fertilizer and spray the leaves of the vegetables, which is more economical and effective. However, you should pay attention to the following techniques during the spraying process:
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