Naphthaleneacetic acid, as an auxin-type plant growth regulator, not only performs the basic functions of general auxins but also plays multiple roles in plant growth. It promotes adventitious root formation and root formation. Whether it’s grape cuttings, tree transplanting, or cuttings of tea, mulberry, oak, or metasequoia, treatment with naphthaleneacetic acid solution significantly increases rooting rates, thereby enhancing plant growth and development.
Naphthaleneacetic acid also effectively promotes rapid enlargement of fruits and tubers. In the cultivation of crops such as sweet potatoes, radishes, and cabbages, soaking or spraying with the solution not only improves crop survival rates but also significantly increases yield and improves quality.
Naphthaleneacetic acid also performs well in increasing fruit set and preserving flowers and fruits. Whether it’s citrus, apples, pears, red dates, watermelons, or cotton, timely treatment with the solution effectively prevents preharvest fruit drop and increases yield.
In addition, NA can also improve the drought resistance, cold resistance, waterlogging resistance, disease resistance, salt and alkali resistance of crops, providing all-round protection for agricultural production.
Promote growth, strengthen plants, increase yield, and improve quality:
(1) Wheat.
In the growth process of wheat, NA plays a vital role. Soaking seeds in 10-20 mg/L solution for 6-12 hours and sowing after washing with clean water can effectively promote tillering and increase the ear formation rate. In addition, timely spraying of solution before jointing and during the tillering period can also enhance the salt and alkali resistance of wheat, increase the thousand-grain weight and the number of grains per ear, and thus significantly increase the yield.
(2) Rice.
Rice also responds positively to NA. Soaking seeds in 10-20 mg/L solution for 6 hours before transplanting, and spraying the solution in time during the growth period can effectively promote the growth of rice, make the plants more robust, and thus increase the yield.
(3) Corn and millet.
For corn and millet, naphthaleneacetic acid also shows a significant promoting effect. By soaking the seeds with 20-30 mg/L solution for 12 hours and spraying the leaves during the growth period, the growth of these two crops can be effectively promoted and the yield can be increased.
(4) Cotton.
Cotton is also very sensitive to naphthaleneacetic acid. Using a concentration of 1-8 mg/L for stem and leaf spraying can effectively regulate the growth of cotton and increase its yield.
(5) Tomato and eggplant.
In the growth process of tomatoes and eggplants, naphthaleneacetic acid also plays an indispensable role. By using 5-12 mg/L solution for foliage spraying before planting and during the flowering period and continuing for three times, the growth of these two crops can be significantly promoted and the yield can be increased.
(6) Cucumber.
Cucumber also responds very positively to naphthaleneacetic acid. Spraying the solution at the right time during the growth period can effectively increase the density of female flowers of cucumber and regulate its growth.
(7) Legumes. Legumes also respond significantly to naphthaleneacetic acid. Soaking seeds in 10-20 mg/L of solution and spraying the solution at the right time during the growth period can effectively promote the growth of legumes, accelerate maturity, and thus increase yield.
(8) Potatoes. Potatoes also respond very positively to naphthaleneacetic acid. Soaking tubers in 10-20 mg/L of solution for 12-24 hours can effectively promote potato growth.
(9) Pineapple. Naphthaleneacetic acid also plays a key role in the growth of pineapples. Spraying or injecting the solution at the right time before flowering, during fruit formation, and in the late vegetative growth period can effectively promote pineapple growth and increase yield.
(10) Sugarcane. Sugarcane also responds very positively to naphthaleneacetic acid. Spraying the solution at the right time during the tillering period can effectively promote sugarcane growth and increase yield.
(11) Apples and lemons. For fruit trees such as apples and lemons, naphthaleneacetic acid also shows a significant yield-increasing effect. By spraying the leaves at the right time, the yield of these two fruit trees can be significantly increased. At the same time, for lemons, spraying 1% of the solution can accelerate the ripening of the fruit and further increase the yield.
(12) Tobacco.
During the growth of tobacco, using 10-20 mg/L of the solution for foliar spraying, and continuing for 2-3 times, can effectively regulate the growth of tobacco plants and significantly improve the quality of tobacco leaves.
Notes:
(1) Since naphthaleneacetic acid has a low solubility in cold water, when preparing it, it can be dissolved in a small amount of alcohol and then diluted with water. Alternatively, a small amount of water can be added to make a paste, and then an appropriate amount of water can be added, and sodium bicarbonate (baking soda) can be added and stirred until it is completely dissolved.
(2) When using naphthaleneacetic acid, it is necessary to pay attention to the particularity of certain fruit varieties. For example, early-maturing apple varieties are prone to drug damage when using flower and fruit thinning. Similarly, the use of 40 mg/L concentrations in autumn white pears can cause yield reduction, and higher concentrations can even lead to adverse effects such as deformity, leaf dryness, and falling. In addition, the use of concentrations above 50 mg/L in figs can also cause phytotoxicity. For watermelons and melons, using too high a concentration is also likely to cause phytotoxicity.
(3) It should be noted that naphthaleneacetic acid has a certain degree of toxicity. Although it does not usually cause poisoning through the esophagus, caution should still be exercised during use. If any symptoms of poisoning occur, seek medical attention immediately.
