Naphthaleneacetic acid: an excellent plant growth regulator
Naphthaleneacetic acid, as an auxin-type plant growth regulator, not only has the basic functions of auxin, but also shows unique advantages in promoting plant growth. It can effectively stimulate the formation of adventitious roots and roots of plants. Whether it is seed rooting, cutting rooting, or fibrous rooting of Solanaceae crops, it can be significantly promoted by naphthaleneacetic acid.
In addition, naphthaleneacetic acid can also accelerate the rapid expansion of fruits and tubers, becoming a leader among vegetable and fruit tree growth regulators. It can also increase the flowering and fruiting rate, effectively prevent the falling of flowers and fruits, and has an anti-drop function. By using naphthaleneacetic acid, not only can the crop yield be increased and the quality be improved, but also the branches and leaves can be lush and the plants can be strong, while at the same time, the resistance of crops to drought, cold, waterlogging, disease, salinity and other adversities can be enhanced.
A. Accelerate the formation of adventitious roots and roots
(1) Grape cuttings. Soaking branches with 100 to 200 mg/L of liquid can stimulate their rapid rooting, promote germination and plant strength.
(2) Tree transplanting. Before transplanting, treating the roots with the same concentration of the drug solution can increase the rooting rate and thus increase the survival rate of the tree. For species such as tea, mulberry, oak and metasequoia, soaking the base of the cuttings in 10 to 15 mg/L of the drug solution for 24 hours can also promote rooting.
B. Promote the rapid expansion of fruits and tubers
(1) Sweet potato. After tying the potato vines, soak the base of the cuttings in 10 to 20 mg/L of the drug solution to a depth of 1 inch, or briefly dip the vines in 80 to 100 mg/L of the drug solution and then immediately transplant them. This can effectively improve the survival rate and promote the expansion of the tubers, ultimately increasing the yield.
(2) Radish and cabbage. Soaking the seeds in 15 to 30 mg/L of the drug solution for 12 hours, then rinsing and sowing can stimulate the expansion of the fruit and thus increase the yield.
C. Improve fruit setting rate and ensure stable fruit growth
(1) Citrus. Spray the fruit stems with 40 to 60 mg/L of the 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 to 20 mg/L of the solution every 15 days starting from the young fruit stage and 45 days before harvest to promote fruit growth, prevent fruit drop before harvest and increase yield.
(3) Watermelon. When the female flowers first open, soak or spray the flowers with 20 to 30 mg/L of the solution to significantly increase the fruit setting rate.
(4) Cotton. Starting from the peak flowering period of the plant, spray the leaves with 1 to 8 mg/L of the solution every 10 to 15 days for three consecutive times to effectively prevent buds and bolls from falling off.
(5) Pepper. Spray the whole plant with 20 mg/L of the solution during the flowering period to prevent flower drop and promote pepper setting.
D. Promote overall growth, enhance plant health, and improve yield and quality
(1) Wheat. Soak the seeds in 10 to 20 mg/L of solution for 6 to 12 hours before sowing, or spray before jointing and tillering. This can promote tillering, increase the ear formation rate, and enhance salt and alkali resistance, ultimately increasing yield.
(2) Rice. Soak rice seeds in 10 to 20 mg/L of solution for 6 hours before transplanting. This can promote greening and plant growth, thereby increasing yield. During the growth period, spraying the flag leaves and ears with 20 to 30 mg/L of solution can also help enhance plant health and increase yield. In addition, during the seedling field period, spraying the leaves with 3 to 10 mg/L of solution can effectively regulate rice growth.
(3) Corn and millet. Soak corn and millet seeds in 20 to 30 mg/L of the solution for 12 hours, then remove and rinse with clean water 1 to 2 times and dry before sowing. During the growing season, spraying with 15 to 20 mg/L of the solution on the leaves can promote the growth of these crops and increase yield.
(4) Cotton. Spraying the stems and leaves of cotton with a concentration of 1 to 8 mg/L helps regulate its growth.
(5) Tomato and eggplant. Before the establishment of the plant and the beginning of the flowering period, spray the leaves with 5 to 12 mg/L of the solution, spraying once every 10 to 15 days for three consecutive times, which can stimulate the growth of the crop and increase yield.
(6) Cucumber. During the growing season of cucumber, spray the whole plant with 5 to 20 mg/L of the solution 1 to 2 times, which can increase the density of female flowers and effectively regulate the growth of cucumber.
(7) Beans. Soak bean seeds in 10 to 20 mg/L of the solution for 5 to 1 hour before sowing. During the growing season, spray again with 5 to 20 mg/L solution 2 to 3 times. This can promote the growth of beans, accelerate maturity and increase yield.
(8) Potatoes. Soak the potato tubers in 10 to 20 mg/L solution for 12 to 24 hours, then sow them. This can effectively promote the growth of potatoes.
(9) Pineapple. Before the pineapple blooms, spray the leaf buds and flower buds with 10 mg/L solution; during the fruit formation period, spray the young fruits with 20 mg/L solution 2 to 3 times; and in the late vegetative growth period, inject 30 ml of 15 to 20 mg/L solution from the heart of the plant. This can promote the growth of pineapples and increase yield.
(10) Sugarcane. During the tillering period of sugarcane, spray the leaves with 15 to 20 mg/L solution 2 to 3 times. This can effectively promote the growth of sugarcane and increase yield.
(11) Apple. Using a concentration of 30 to 50 mg/L for foliar spraying 1 to 2 times can significantly increase apple yield.
(12) Lemon. Spraying the lemon crown with a 1% solution can accelerate the ripening of lemon fruit and increase yield.
(13) Tobacco. During the tobacco growth period, spraying the leaves with a concentration of 10 to 20 mg/L for 2 to 3 times can effectively regulate the growth of tobacco plants and improve the quality of tobacco leaves.
E. Precautions
(1) Since naphthaleneacetic acid has a low solubility in cold water, it is recommended to dissolve it in a small amount of alcohol first and then gradually dilute it with water, or add a small amount of water to make a paste, then add an appropriate amount of water and add sodium bicarbonate (baking soda) and stir until it is completely dissolved.
(2) For early-maturing apple varieties, be cautious when thinning flowers or fruits to avoid drug damage. Using a concentration of 40mg/L on autumn white pears may result in yield reduction, and higher concentrations can also cause adverse effects such as deformities, leaf dryness, and shedding. Figs can also be harmed by the phytosanitary agent at concentrations exceeding 50mg/L. Furthermore, careful dosage should be used on watermelons and melons to avoid phytosanitary effects.
