What is the commonly used concentration of foliar fertilization?

Which fertilizers can be used as foliar fertilizers? What is the appropriate concentration? Experienced netizens are also asked to introduce manganese sulfate, zinc sulfate, rice vinegar, ammonium molybdate, potassium dihydrogen phosphate, urea, copper sulfate, plant ash, calcium superphosphate and borax, which are often used as foliar spraying fertilizer for crops. the above fertilizers used as foliar fertilization can quickly supplement nutrients for crops, relieve the physiological diseases caused by lack of nutrients, promote the healthy growth of crops and increase yield. Therefore, the farming network has sorted out the above fertilizers as the best concentration of foliar fertilization, which is listed in detail below for netizens' reference. Manganese sulfate: the best solution for foliar fertilization is 0.05% 0.1%. Zinc sulfate: can be sprayed after adding a small amount of lime liquid to the solution, and the best spraying concentration is 0.1% 0.2%. Rice vinegar: 2005ml rice vinegar is sprayed on crops with water of 40kg and 50kg. Ammonium molybdate: suitable for foliar spraying of legume crops, the best concentration is 0.05-0.1%. Potassium dihydrogen phosphate: the best concentration for foliar spraying of crops is 0.3%, and the fertilizer is fully dissolved before spraying. Urea: the best concentration of foliar spraying with urea is 1%-2%. When using, it must be noted that if the content of diuretic in urea is more than 1.5%, it will be toxic to crops. Therefore, the content of biuretic should not exceed 1.5%. Copper sulfate: the best concentration of spraying on the leaves of crops is 0.02%-0.05%. When in use, a small amount of lime liquid is added to the solution to avoid toxicity. Plant ash: commonly used concentration of 5% to 7%. Must be used for plant ash and water preparation, add water static filter for 15 hours before spraying. Calcium superphosphate: the best concentration of spraying on the leaves of crops is 2%. When in use, the calcium superphosphate is fully stirred after adding water, and then placed for 24 hours and filtered, the clear liquid is sprayed. Borax (or boric acid): the best concentration of spraying on crops is 0.2%-0.3%. Borax can be dissolved in a small amount of 45 ℃ hot water and then diluted with water. What foliar fertilizer can be used for vegetables? what are the advantages of foliar fertilizer?