Fertilize greenhouse vegetables in the low temperature season. It is more economical and effective to spray the vegetable leaves after diluting the micro-fertilizer. However, you should pay attention to the following five skills during the spraying process:
The concentration is suitable to receive good results, and the application 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 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.
The dosage is generally 40 to 70 kilograms of fertilization solution, which makes it possible to wet the stems and leaves of vegetables.
The number of blade sprays generally uses less fertilizer, 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 is to reduce the loss of micro-fertilizer in 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, which is beneficial to increase the spraying time. effect.
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