The concentration of the applied concentration is too high, not only unhelpful, but harmful. Generally speaking, the suitable spraying concentration of various micro-fertilizers is: 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%~ 0.02%, iron sulfate solution 0.2% to 1%.
The period of spraying the micro-fertilizer during the period must be determined according to different vegetable varieties and different micro-fertilizer varieties, and it is generally appropriate to spray before flowering.
The dosage is 40 to 75 kilograms of the general fertilization solution, which makes it possible to wet the stems and leaves of vegetables.
The number of times of spraying on the leaf surface is generally less than the amount of fertilizer used, and 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.
The time is to reduce the loss of micro-fertilizer during the spraying process, which is beneficial to the absorption of the leaves. It should be sprayed on the cloudy or sunny afternoon to the evening, which can prolong the residence time of the fertilizer solution on the vegetable leaves and improve the spraying effect.
Mixed spray two or more kinds of micro-fertilizer mixed spraying, or mixed with pesticides, can save the process, play a multi-effect, but to clear the fat and medicinal properties, such as the opposite nature, mutual Obstruction, never mix and spray. All kinds of micro-fertilizers should not be mixed with alkaline fertilizers such as grass ash and lime; zinc fertilizer should not be mixed with super-calcium phosphate; copper fertilizer should not be mixed with potassium dihydrogen phosphate solution. 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 a mixed spraying solution, generally, a micro-fertilizer is first formulated into an aqueous solution, and then other medicines and fertilizers are directly added to the prepared micro-fertilizer solution for dissolution.
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