1. Application Techniques
a. Breaking Dormancy and Enhancing Germination
- Wheat: Soaking seeds in 1.67% fulvic acid solution for 30 minutes increases germination rate by approximately 4.87% compared to control groups, promoting seedling growth.
- Rapeseed, Millet, Sesame, Rice, Corn, Peanuts: Soaking seeds in 0.5% fulvic acid solution for 2 hours before sowing improves germination potential, germination rate, and seedling stress resistance.
- Melons, Watermelon, Cucumber, Sunflower: Soaking seeds in 0.5% fulvic acid solution for 10–20 hours enhances germination potential, germination rate, and seedling resilience.
- Alfalfa: Soaking seeds in 0.05% fulvic acid solution for 10–20 hours boosts germination potential and seedling stress tolerance.
b. Enhancing Stress Resistance and Increasing Yield
- Wheat: Field irrigation with 0.2% fulvic acid solution significantly elevates chlorophyll content during seedling and tillering stages, improving growth quality and stress resistance.
- Soybean: Foliar spraying with 0.16% fulvic acid solution at initial flowering stage enhances stress resistance and yield.
- Tomato: Foliar application of 0.04% fulvic acid solution during seedling, flowering, and fruiting stages significantly increases yield.
- Strawberry: Applying 3 kg of fulvic acid per acre after transplanting boosts production.
- Potato: Irrigation with 0.05% fulvic acid in continuous cropping fields mitigates declines in chlorophyll, proline, and soluble sugar content. It also raises starch, vitamin C, and soluble protein levels in tubers, enhances superoxide dismutase and catalase activity, and reduces malondialdehyde and reactive oxygen levels.
- Cabbage, Fennel, Cilantro, Radish: Foliar spraying with 0.25%–0.34% fulvic acid solution during mid-growth stage significantly improves yield.
- Apple: Root irrigation with 500 mg/L solution or foliar spraying with 1000 mg/L solution before drought stress enhances drought resistance and sugar content.
- Sugarcane: Foliar spraying with 1000 mg/L fulvic acid solution in late growth stages significantly increases yield.
- Peanut: Foliar application of 1000 mg/L solution at seedling, flowering, and pod-setting stages improves drought resistance and yield.
- Corn: Spraying 133 mg/L fulvic acid (potassium) solution at the 7-leaf stage increases grain count, 1000-grain weight, and overall yield.
2. Precautions
Fulvic acid is a broad-spectrum plant growth regulator primarily used for drought resistance, disease prevention, and yield enhancement. Its dosage is flexible, and it generally has no toxic or adverse effects.
