Naphthaleneacetic acid is a plant growth regulator of the auxin class. In addition to the basic functions of general auxins, it can also promote the formation of adventitious roots and roots of plants. It is used to promote seed rooting, cutting rooting, and fibrous rooting of Solanaceae crops. It can promote the rapid swelling of fruits and tubers, so it can be used as a swelling agent on vegetables and fruit trees. It can increase the flowering and fruiting rate, prevent the falling of flowers and fruits, and has an anti-falling function. It can not only increase yield, improve quality, promote luxuriant branches and leaves, and make plants strong, but also effectively improve the crop's ability to resist drought, cold, waterlogging, disease, salt and alkali, and stress.
1. Promote the formation of adventitious roots and roots
(1) Grapes. Before cutting, dip the branches with 100-200mg/L solution to promote rooting, rapid germination, and strong plant development.
(2) Tree transplanting. Dip the roots with 100-200mg/L solution before transplanting to promote rooting and increase survival rate. For tea, mulberry, oak, metasequoia, etc., dip the base of the cuttings with 10-15mg/L solution for 24 hours to promote rooting.
2. Promote rapid expansion of fruits and tubers
(1) Sweet potato. Bundle the potato vines and soak the base with 10-20mg/L solution to a depth of 1 inch. Transplant the seedlings after 6 hours; or dip the seedlings with 80-100mg/L solution for 1 inch for 3 seconds and transplant them immediately; this can improve survival rate, expand the tubers, and increase yield.
(2) Radish and cabbage. Soak the seeds in 15-30 mg/L solution for 12 hours, remove and rinse with clean water 1-2 times, and sow after drying. This can promote fruit expansion and increase yield.
3. Improve fruit setting rate, preserve flowers and fruits, and prevent fruit drop
(1) Citrus. Spray the fruit pedicle with 40-60 mg/L solution 15 days before harvest to prevent fruit drop before harvest and increase yield.
(2) Apple, pear, and red date. Spray the whole plant with 15-20 mg/L solution during the young fruit stage. Start 45 days before harvest and spray once every 15 days. Spray the whole plant 2-3 times. This can promote growth, prevent fruit drop before harvest, and increase yield.
(3) Watermelon. When the female flowers first open, soak or spray the flowers with 20-30 mg/L solution to increase fruit setting rate.
(4) Cotton. At the beginning of the flowering period, spray the leaves with 1-8 mg/L solution, once every 10-15 days, for a total of three times. This can prevent buds and bells from falling off.
(5) Pepper. Spray the whole plant with 20 mg/L during the flowering period to prevent flowers from falling and promote pepper production.
4. Promote growth, strengthen plants, increase production, and improve quality
(1) Wheat. Soak seeds in 10-20 mg/L solution for 6-12 hours, remove and rinse with clean water 1-2 times, and sow after drying; spray 15-25 mg/L solution before jointing; spray 20-30 mg/L solution on flag leaves and panicles during the tillering period to promote tillering and increase the panicle rate. After application, the salt-alkali resistance can be improved, the yield can be increased, the thousand-grain weight can be increased, the number of grains per panicle can be increased, the resistance to dry hot winds can be increased, and the yield can be increased.
(2) Rice. Soak the seeds in 10-20 mg/L solution for 6 hours before transplanting; spray the flag leaf and panicle with 20-30 mg/L solution to promote greening, make the plant strong and increase yield. Use 3-10 mg/L concentration in rice seedling fields and spray on the leaves to regulate rice growth.
(3) Corn and millet. Soak the seeds in 20-30 mg/L solution for 12 hours, remove and rinse with clean water 1-2 times, and sow after drying; spray 15-20 mg/L solution on the leaves during the growth period to promote growth and increase yield.
(4) Cotton. Spray the stems and leaves with 1-8 mg/L concentration to regulate growth.
(5) Tomato and eggplant. Spray the leaves with 5-12 mg/L solution before planting and at the beginning of flowering, once every 10-15 days, for a total of 3 times, to promote growth and increase yield.
(6) Cucumber. During the growth period, spray the whole plant with 5-20 mg/L solution 1-2 times to increase the density of female flowers and regulate growth.
(7) Beans. Soak the seeds in 10-20 mg/L solution for 0.5-1 hour before sowing; spray 2-3 times with 5-20 mg/L solution during the growth period to promote growth, accelerate maturity and increase yield.
(8) Potatoes. Soak the tubers in 10-20 mg/L solution for 12-24 hours to promote growth.
(9) Pineapple. Spray the leaf buds and flower buds with 10 mg/L solution before flowering. When the fruit is formed, spray the young fruit with 20 mg/L solution 2-3 times. In the late stage of vegetative growth, inject 30 mL of 15-20 mg/L solution from the center of the plant to promote growth and increase yield.
(10) Sugarcane. Spray the leaves with 15-20 mg/L solution 2-3 times during the tillering period to promote growth and increase yield.
(11) Apple. Use a concentration of 30-50 mg/L and spray the leaves 1-2 times to significantly increase yield.
(12) Lemon. Spraying the lemon tree crown with 0.1% solution can accelerate fruit ripening and increase yield.
(13) Tobacco. Spraying the leaves with 10-20 mg/L solution 2-3 times during the growth period can regulate tobacco plant growth and improve tobacco leaf quality.
Precautions
(1) Naphthaleneacetic acid is difficult to dissolve in cold water. When preparing, it can be dissolved in a small amount of alcohol and then diluted with water, or a small amount of water can be added to make a paste and then add an appropriate amount of water, and then sodium bicarbonate (baking soda) can be added and stirred until it is completely dissolved.
(2) Early-maturing apple varieties are prone to phytotoxicity when using flower and fruit thinning. Using 40 mg/L for autumn white pear will cause a reduction in yield, and too high a concentration will cause deformity, dead leaves, and shedding. Using 50 mg/L or more for figs will cause phytotoxicity. Excessive use of watermelon and melon can easily cause phytotoxicity.
(3) It can cause poisoning through the esophagus, and liver and kidney damage can be seen. There is no specific antidote. If symptoms of poisoning occur, go to the hospital immediately for treatment.
