According to reports, it is appropriate to spray the micro-fertilizer concentration on vegetables. Generally speaking, the suitable spraying concentration of various micro-fertilizers is: boric acid or borax solution 0.05% to 0.2%, ammonium molybdate solution 0.02% to 0.05%, zinc sulfate solution 0.05% to 0.2%, sulfuric acid tong solution 0.01%~ 0.02%, iron sulfate solution 0.2% to 1%. Spraying 40-75 kilograms of fertilized liquid on one acre of land can make the stems and leaves of vegetables suitable for wet. Generally, it should be sprayed 2 to 4 times according to the length of the vegetable growth period. When spraying, it should be noted that 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 superphosphate. Copper fertilizer should not be mixed with potassium dihydrogen phosphate solution.
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