Foliar spraying (extra-root dressing) of crops can quickly supplement nutrients, relieve the physiological diseases of crops due to lack of nutrient elements, promote robust growth of crops, and increase yield. The following describes the use of foliar fertilizer concentration:
1. Potassium dihydrogen phosphate: Commonly used concentration is 0.3%. Method: Add 300 kg of potassium dihydrogen phosphate to 100 kg of water and spray thoroughly after dissolving.
2. Urea: The commonly used concentration is 1% to 2%. When using it, be careful that if the content of diuretic urea in the urine exceeds 1.5%, it will have a toxic effect on the crop. Therefore, the foliar spray cannot be performed.
3. Plant ash: commonly used concentrations 5% to 7%. Must be used to add water to plant ash preparation, add water for 15 hours after filtration.
4. Superphosphate: Concentration 2%. After the superphosphate was added with water, the mixture was stirred well and allowed to stand still for 24 hours. After that, the supernatant was sprayed.
5. Boron (or boric acid) is commonly used in concentrations of 0.2% to 0.3%. Method: First use a small amount of hot water soluble borax at 45°C, then dilute with water.
6. Paclobutrazol: Fruit trees were sprayed with 1000-1500 mg/kg solution and crops were sprayed with 50 mg/kg solution.
7. Copper sulfate: commonly used concentration 0.02% ~ 0.05%. When used, a small amount of lime solution is added to the solution to eliminate poisoning.
8. Manganese Sulfate: The common concentration is 0.05% to 0.1%.
9. Zinc Sulfate: The commonly used concentration is 0.1% to 0.2%. Spray a small amount of lime solution in the solution.
10. Rice vinegar: spray with 200-250 ml of water 45-50 kg.
11. Ammonium molybdate: The legume crops were sprayed at a usual concentration of 0.05 to 0.1%.
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