Concentration 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%.
Period The period of spraying micro-fertilizer must be determined according to different vegetable varieties and different micro-fertilizer varieties, and it is generally suitable for flowering spraying.
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 leaves is generally less than the amount of fertilizer used, so it is difficult to meet the needs of all growth and development of vegetables. 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 during spraying, which is good for leaf absorption. It should be sprayed on cloudy or sunny afternoon to evening, which can prolong the residence time of fertilizer solution on vegetable leaves, which is beneficial to improve spraying effect. .
Source: Agricultural Science and Technology News
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