The safe dosage of micro-fertilizer on vegetables is a substitute for a large number of elements (such as nitrogen, phosphorus, potassium, etc.) for the growth and development of vegetables. Once a trace element is lacking, vegetables will show corresponding symptoms of deficiency. However, the critical range between many trace elements from lack to excess is very narrow. If the amount of micro-fertilizer applied is too large or uneven, it will often have a toxic effect on vegetables. The following is the safe use of commonly used micro-fertilizers on general vegetables:
Iron fertilizer (ferrous sulfate): The soil application rate is 1-3.75 kg/mu, and the foliar spray 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%, and the foliar spray concentration is 0.3%-0.5%.
Manganese fertilizer (manganese sulfate or manganese chloride): The soil application rate is 1-2.25 kg/mu, the soaking concentration is 0.05%-0.10%, and the foliar spray concentration is 0.05%-0.10%.
Copper fertilizer (copper sulfate): The soil application rate is 1.5-2.0 kg/mu, the soaking concentration is 0.01%-0.05%, and the foliar spray concentration is 0.02%-0.04%.
Zinc fertilizer (zinc sulfate): soil application rate 0.25-2.50 kg / mu, soaking seeds. 02% -0.05%, foliar spray concentration 0.1% -0.5%.
Molybdenum fertilizer (ammonium molybdate): The soil application rate is 30-200 g/mu, the soaking concentration is 0.05%-0.10%, the foliar spray concentration is 0.02%-0.05%, and the seed dressing is 2-6 g per kg of seed.
Iron fertilizer (ferrous sulfate): The soil application rate is 1-3.75 kg/mu, and the foliar spray 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%, and the foliar spray concentration is 0.3%-0.5%.
Manganese fertilizer (manganese sulfate or manganese chloride): The soil application rate is 1-2.25 kg/mu, the soaking concentration is 0.05%-0.10%, and the foliar spray concentration is 0.05%-0.10%.
Copper fertilizer (copper sulfate): The soil application rate is 1.5-2.0 kg/mu, the soaking concentration is 0.01%-0.05%, and the foliar spray concentration is 0.02%-0.04%.
Zinc fertilizer (zinc sulfate): soil application rate 0.25-2.50 kg / mu, soaking seeds. 02% -0.05%, foliar spray concentration 0.1% -0.5%.
Molybdenum fertilizer (ammonium molybdate): The soil application rate is 30-200 g/mu, the soaking concentration is 0.05%-0.10%, the foliar spray concentration is 0.02%-0.05%, and the seed dressing is 2-6 g per kg of seed.
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