【1】Functional Characteristics
Naphthylacetamide (NAD)
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Absorption: Slowly absorbed via plant stems and leaves with limited translocation.
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Mechanism:
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Induces abscission layer formation in fruit peduncles → fruit thinning agent.
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Promotes root initiation (typically combined with other rooting agents).
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【2】Application Techniques
Apple
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Fruit Thinning:
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Early-season varieties: Apply 25–50 mg/L NAD within 10 days after full bloom (optimal: petal fall stage).
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Mid-/Late-season varieties: Spray 10–25 days after full bloom.
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Recommended Varieties:
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Jonathan,Early McIntosh,McIntosh,Red Dragon,Weijing: 25–50 mg/L. -
Biennial-bearing varieties: Use 50 mg/L under warm, windless conditions.
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Anti-Preharvest Drop: Apply during late growth stages.
Pear
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Method: Whole-plant spray with 25–50 mg/L NAD 5–7 days after flowering.
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Effect: Thins excess small fruits.
【3】Precautions
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❌ Avoid on “Red Delicious” and “Starkrimson” apples:
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NAD’s prolonged action increases risk of undersized fruits compared to NAA.
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⚠️ Critical Parameters:
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Strictly control spray timing and concentration.
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🚫 Contraindicated Conditions:
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Avoid in orchards with nutrient/water deficiencies or high-density planting.
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