Boric Acid (H₃BO₃) containing 17.5% water-soluble boron is the primary and most widely used boron source in agriculture. It is the reference standard against which all other boron fertilizers are measured for efficiency and solubility.
Boron's role in plants: Boron is essential for cell wall formation (cross-linking of pectic polysaccharides in the primary cell wall), pollen germination and tube growth (pollen cannot germinate or grow without adequate boron), sugar transport across cell membranes, and reproductive organ development. Deficiency causes: hollow stem in cauliflower and broccoli, internal browning in beet and turnip, cracked stem in celery, poor berry set in grapes, fruit cracking in pomegranate, and suppressed pollen viability in all crops.
Boron deficiency is the second most common micronutrient deficiency in India after zinc — most common in light sandy soils, leached tropical soils and high-rainfall areas. Boric acid is approved under FCO for agricultural use and is also widely used in glass manufacturing, pharmaceuticals, cosmetics and as a pH buffer in laboratory applications.
| Boron (B) | 17.5% min |
| Chemical Formula | H₃BO₃ |
| Purity (as H₃BO₃) | 99.5% min |
| Moisture | 0.5% max |
| pH (1% solution) | 4.8–5.5 |
| Solubility at 25°C | 50 g/L |
| Solubility at 80°C | 270 g/L |
| Heavy Metals | <10 ppm |
| Foliar Spray | 1–2 g per litre of water |
| Soil Application | 1–3 kg per acre — broadcast or band |
| Critical Stage | Apply at pre-flowering, full flowering and fruit set |
| Frequency | 2–3 applications per season |
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