Naphthalene Acetic Acid (NAA) 4.5% SL is a synthetic auxin-type plant growth regulator with one of the broadest registration profiles under CIB in India. Auxins control cell elongation, root initiation, apical dominance and fruit development through interaction with the TIR1/AFB co-receptor system that regulates gene expression.
Primary agricultural uses: Fruit thinning (apple, pear) — applied early post-bloom at low concentration (5–20 ppm) causes selective abscission of weakly attached fruitlets, improving size and quality of remaining fruit while reducing biennial bearing. Prevention of pre-harvest drop (apple, mango) — applied 2–4 weeks before anticipated harvest strengthens the abscission zone and reduces drop losses significantly. Rooting of cuttings — high concentration dip treatment (1000–3000 ppm) in nursery settings induces adventitious root formation on difficult-to-root cuttings. Promotion of fruit set in parthenocarpic varieties of tomato, capsicum and cucumber under cold/hot weather conditions.
| NAA Content | 4.5% w/v |
| Formulation | Soluble Liquid (SL) |
| pH | 8.5–10.5 (alkaline) |
| Specific Gravity | 1.01–1.05 |
| CIB Registration | Valid — multiple crops |
| Mode of Action | Synthetic auxin — TIR1 receptor |
| PHI | Variable by use — see label |
| Shelf Life | 2 years |
| Fruit Thinning (Apple) | 10–20 ppm spray 2–4 weeks post-bloom |
| Drop Prevention (Apple) | 20–40 ppm spray 2–4 weeks pre-harvest |
| Drop Prevention (Mango) | 20–30 ppm spray at marble size |
| Rooting (Cuttings) | 1000–3000 ppm quick dip (0.5–2 sec) |
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