Trace elements have an irreplaceable effect on the growth and development of vegetables. Once a certain trace element is lacking, the vegetables will show the corresponding lack of symptoms, but the critical range of many trace elements from the lack to the excess is very narrow. If the amount of micro-fertilizer applied is too large or uneven, it tends to have a toxic effect on vegetables. Here is the safe amount of commonly used micronutrients in common vegetables:
Iron fertilizer (ferrous sulfate): The application amount of soil is 1-3.75 kg/mu. Foliar spraying concentration is 0.2%-1.0%.
Boron fertilizer (borax or boric acid): The soil application rate is 0.75-1.25 kg/mu. The soaking concentration is 0.02%-0.05%. Foliar spray attempts are 0.3%-0.5%.
Manganese fertilizer (manganese sulfate or manganese chloride): The application amount of soil is 1-2.25 kg/mu. Foliar spraying concentration is 0.05%-0.10%.
Copper fertilizer (copper sulphate): The amount of soil applied is 1.5-2.0 kg/mu. The soaking concentration is 0.01%-0.05%. The foliar spraying concentration is 0.02%-0.04%.
Zinc fertilizer (zinc sulphate): The soil application rate is 0.25-2.50 kg/mu. The soaking concentration is 0.02%-0.05%. Foliar spraying concentration is 0.1%-0.5%.
Molybdenum fertilizer (ammonium molybdate): The application amount of soil is 30-200 g/mu. The soaking concentration is 0.05%-0.10%%. Foliar spraying concentration is 0.02%-0.05%. Seed dressing with 2-6 grams per kilogram.
Iron fertilizer (ferrous sulfate): The application amount of soil is 1-3.75 kg/mu. Foliar spraying concentration is 0.2%-1.0%.
Boron fertilizer (borax or boric acid): The soil application rate is 0.75-1.25 kg/mu. The soaking concentration is 0.02%-0.05%. Foliar spray attempts are 0.3%-0.5%.
Manganese fertilizer (manganese sulfate or manganese chloride): The application amount of soil is 1-2.25 kg/mu. Foliar spraying concentration is 0.05%-0.10%.
Copper fertilizer (copper sulphate): The amount of soil applied is 1.5-2.0 kg/mu. The soaking concentration is 0.01%-0.05%. The foliar spraying concentration is 0.02%-0.04%.
Zinc fertilizer (zinc sulphate): The soil application rate is 0.25-2.50 kg/mu. The soaking concentration is 0.02%-0.05%. Foliar spraying concentration is 0.1%-0.5%.
Molybdenum fertilizer (ammonium molybdate): The application amount of soil is 30-200 g/mu. The soaking concentration is 0.05%-0.10%%. Foliar spraying concentration is 0.02%-0.05%. Seed dressing with 2-6 grams per kilogram.
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