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[1] Application Techniques
a. Promoting Seed Germination and Regulating Seedling Growth
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Corn: Treat seeds with 10-30 mg/L IAA to promote seed germination and seedling growth.
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Soybean: Treat seeds with 10-15 mg/L solution; spray seedlings and flowering plants with 10-15 mg/L solution. This regulates vegetative and reproductive growth, enhances stress resistance, and increases yield.
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Wheat: Treat seeds with 10-15 mg/L solution; spray during the jointing stage with 10-15 mg/L solution. Promotes growth, enhances stress resistance, and increases yield.
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Rice: Treat seeds with 10-15 mg/L solution; spray during the jointing stage with 10-15 mg/L solution. Promotes growth, enhances stress resistance, and increases yield.
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Tomato, Cucumber: Treat seeds with 0.75-1 mg IAA per kg of seeds. Spray foliage during seedling and flowering stages with 6-12 mg/L solution. Promotes growth, enhances stress resistance, and increases yield.
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Radish: Soak radish seeds in 50-100 mg/L IAA solution for 3 hours. Significantly improves germination rate, germination vigor, and vigor index, resulting in seedlings emerging 2-3 days earlier.
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Chive (Jiu Cong): Soak seeds in 2-5 mg/L IAA solution for 24 hours to improve germination rate and germination vigor. The 3 mg/L treatment is most effective, increasing germination vigor and germination rate by 29%.
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Broad Bean (Fava Bean): Soak seeds in 10-100 mg/L IAA solution for 24 hours. Increases pod number and seed weight, increases seed polysaccharide content, and improves quality and yield.
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Garlic: Cultivating garlic cloves in a 0.18×10^{-3} mg/L IAA solution promotes root growth and development. However, further increases in concentration inhibit root growth and development.
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Betel Nut (Areca): Soak seeds in 150 mg/L IAA for 24 hours to improve germination rate and promote root system development.
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Chinese Angelica (Dang Gui): Soak seeds in 50 mg/L IAA solution for 3 hours to significantly increase germination rate.
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Hydrilla verticillata: Treat turions with 100-150 mg/L IAA for 12 hours to promote turion germination, increase seedling height and dry weight, and increase the number of seedling roots.
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Vallisneria natans (Eelgrass): Treating seeds with 50 mg/L IAA for 24 hours provides the best promotion effect on seed germination and seedling height.
b. Regulating Growth, Increasing Yield, and Improving Quality
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Cucumber: Spray leaves with 500 mg/L IAA when seedlings have 1-3 true leaves. Increases the number of female flowers and reduces the number of male flowers.
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Watermelon: Spray with 15 mg/L IAA after flowering, repeating once after 7 days. Effectively reduces fruit cracking. (Note: The phrase about summer squash appears misplaced in the original and is omitted here as context is unclear.)
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Strawberry: Foliar spray with 50 mg/L IAA after transplanting effectively increases photosynthetic rate and dry weight of leaves, stems, roots, and other organs.
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Tobacco: Applying 45 mg/L or 60 mg/L IAA results in higher economic benefits per unit area, effectively reduces nicotine content, and improves flue-cured tobacco quality.
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Tea: Foliar spray with 0.09 mg/L IAA promotes earlier bud break, increases bud density, and significantly increases yield.
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Shiitake Mushroom: Spraying with 0.5-2.0 mg/L IAA significantly increases mycelial elongation and improves yield.
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Wood Ear Mushroom (Auricularia): Spray twice during the primordia formation stage with 0.02 mg/L IAA to effectively promote primordia formation and fruiting body differentiation, increasing yield by over 20%.
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Cordyceps sinensis: Adding 2.5 mg/L IAA to the culture medium increases Cordyceps biomass and extracellular polysaccharide yield.
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Chrysanthemum: Spraying once with 25-400 mg/L solution (under 9-hour photoperiod) inhibits flower bud emergence and delays flowering.
c. Rooting Cuttings and Promoting Survival
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Cabbage (Gan Lan): Dip roots in 1000-2000 mg/L IAA solution before transplanting to promote rooting and shorten the recovery time.
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Rose: Soak rose cuttings in 175 mg/L IAA for 1 minute to achieve the highest rooting rate and root number.
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Sea Buckthorn: Soak cuttings in 100-300 mg/L IAA solution for 30 minutes to promote rooting of hardwood cuttings.
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Poplar: Quick-dip cuttings in 200 mg/L IAA solution can increase the rooting rate to 86%.
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Sarcozygium xanthoxylon (Ba Wang): Soak hardwood cuttings in 50-100 mg/L IAA for 3 hours to improve rooting effectiveness.
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Zamioculcas zamiifolia (ZZ Plant / Money Tree): Treat cuttings with 150 mg/L IAA for 1 hour to significantly increase root number and length.
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Lindera communis (Spicewood / Xiang Ye Shu): Soak cuttings in 100-300 mg/L IAA solution for 24 hours to promote rooting.
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Pothos (Epipremnum aureum): Using a 4×10^{-5} mg/L IAA solution as the hydroponic nutrient promotes growth, resulting in thicker roots and a greater number of roots.
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Lilac: Soak cuttings in 150 mg/L IAA for 2 hours for a good rooting promotion effect.
[2] Precautions
IAA is photosensitive and decomposes easily when exposed to light. Products must be packaged in black material and stored in a cool, dry place.
