How to use plant growth regulators?
Main text core introduction: Knowledge about home flower cultivation, how to use plant growth regulators? The following is a specific introduction:
Plant growth regulators are a type of chemically synthesized substances that regulate and control plant growth. They can alter the development and flowering process of ornamental plants. Currently, the widely used growth regulators in flower cultivation are divided into three categories:
(1) Auxin-type growth regulators. These agents can promote growth at low concentrations and inhibit growth at high concentrations. They are widely used in flowers to promote asexual propagation and root formation in cuttings. Common agents include indolebutyric acid (IBA) and naphthylacetic acid (NAA). There are two methods of application: one is a solution, where IBA is first dissolved in a small amount of alcohol and then diluted with water to make a 5000ppm solution, which is further diluted to the required concentration for use. The other is a dry powder, where IBA is mixed with talcum powder at a ratio of 0.1% to 1%, and the base of the cutting is dipped in this mixture before planting.
(2) Gibberellin-type growth regulators. These agents have the effects of promoting germination, growth, and preventing the shedding of flowers and fruits in various flowers. Gibberellin is easily soluble in water and should be prepared as needed, otherwise it may become ineffective. Using a concentration of 30ppm to 100ppm of gibberellin can promote the stem and leaf elongation of many annual and biennial herbaceous flowers (such as snapdragons, marigolds, etc.) and perennial flowers (such as chrysanthemums, peonies, etc.). Experiments have shown that gibberellin can effectively break the dormancy patterns of seeds, perennial roots, and bulbous flowers, promoting germination. Spraying gibberellin on ornamental trees can also have the effects of rapid sprouting, vigorous growth of branches and leaves, and early flowering.
(3) Growth inhibitors. These agents can control the synthesis or metabolism of hormones in flowering plants, alter the distribution of assimilates, and regulate the growth and development of flowers. Their effects can make the flower stems thicker and shorter, leaves darker green, and leaf blades thicker. Since the growth of the stems is inhibited, it reduces the competition for nutrients during the germination of flower buds, thus enabling flowers to bloom earlier. Common inhibitors used are Chlormequat and B9. The concentration range varies depending on the type of flower. Using Chlormequat or B9 can not only significantly reduce the height of flowers but also extend the vase life or pot life of cut flowers. For example, using 50ppm (summer) or 10ppm to 25ppm (winter) of Chlormequat, or soaking overnight in 500ppm B9 at the base of the cut stems of carnations can extend the viewing time by 2 to 3 days.
After using the growth regulator, it is necessary to strengthen lighting and water and fertilizer management, otherwise it is difficult to achieve the expected results.
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