If the concentration is too high, it is not only useless but harmful. In general, the suitable spraying concentration of various fertilizers is: 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%, iron sulfate solution 0.2% ~ 1%.
The period of spraying the fertilizer must be determined according to different vegetable varieties and different varieties of micro-fertilizers, and it is generally appropriate to spray the flowers.
The amount of general mu fertilizer solution 40 to 70 kg, can make the stems and leaves of vegetables wet.
Frequent application of leaf fertilizer is less, so it is difficult to meet the needs of the entire growth and development process at a time. Therefore, it should generally be based on the length of the vegetable growth period, spraying 2 to 4 times is appropriate.
The time is to reduce the losses of trace fertilizers during the spraying process, which is beneficial to the absorption of leaves. Spraying should be performed in cloudy or sunny afternoons from the afternoon to the evening. This can extend the residence time of the fertilizer solution on the leaves of the vegetables and improve the spraying effect. .
In addition, the dual effects of fertilizer efficiency and drug efficacy should be considered when spraying with pesticides. In general, all kinds of micro fertilizers should not be mixed with alkaline pesticides. When preparing a mixed spraying solution, generally, a kind of micro-fertilizer is first formulated into an aqueous solution, and then other drugs and fertilizers are directly added into the prepared micro-manure solution according to the amount and dissolved.
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