1 concentration. The proper concentration can receive a good fertilization effect. If the application concentration is too high, it will not only be useless, but it will be harmful. Appropriate 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%, sulfuric acid Iron solution 0.2% to 1%.
2 periods. 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 when flowering.
3 dosage. General mu fertilizer solution 40 ~ 70 kg, so that the stems and leaves of vegetables wet is appropriate.
4 times. The amount of fertilizer used for leaf spraying is generally less, so it is difficult to meet the needs of the entire growth and development process at one time. Therefore, it should generally be based on the length of the vegetable growth period, spraying 2 to 4 times is appropriate.
5 times. In order to reduce the loss of trace fertilizer in the spraying process, it is beneficial for the blade to absorb, and it should be sprayed on cloudy or sunny days 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. .
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