Rooting agents are one type of plant growth regulators whose role is to promote the rooting of plants and play a significant role in the cutting propagation of plants.
The main rooting agents are indole butyric acid, indole acetic acid and naphthaleneacetic acid. Different plants have different sensitivities to rooting agents, so the use of two or more rooting agents is better. The ABT rooting powder developed and promoted by China Forestry University is a mixture of several rooting agents in different proportions, with good rooting effects.
In addition to promoting the rooting of cutting branches, rooting agents in the process of tree transplanting, root rooting or spraying aqueous rooting agent solution, can promote long and new roots of transplanted trees, improve the survival rate of transplanting.
The method of using rooting agents can be roughly classified into three types: The first method is to soak the lower part of the cutting branches with a solution of a low concentration rooting agent, such as the Chinese rose bud cuttings soaked in a solution of 50 mg/kg each of butyric acid and naphthaleneacetic acid. Hours, can significantly promote the rooting of the shoots in the process of cutting seedlings. The second is to treat the cuttings with a high concentration of rooting agent solution for a short period of time. For example, a 1000 mg/kg concentration of indolebutyric acid or other rooting agent alcohol solution is used to dip the cuttings into the lower part for 3 to 5 seconds and after drying Cuttings and rooting are also good. The third method is to dissolve the rooting agent in alcohol first, then mix it with talcum powder, then dry it and grind it into powder. When used, the branches are first moistened with water, and then the powder is picked up and then cut. The biggest advantage of the third treatment method is the saving of medicaments. After being made into a dry powder, the rooting agent has a longer period of viability, and the aqueous rooting agent has a shorter period of time and becomes ineffective after 3 days at room temperature. The rooting agent in the alcoholic solution remains active longer, but it is best to store the solution in the refrigerator at low temperatures.
The rooting agent is not easy to dissolve in water. It is best to use alcohol or a small amount of liquor above 50°C to dissolve, and then dilute it with hot water of about 60°C to match the required concentration.
The following are the treatment concentrations and methods of some cuttings. The rooting effect is influenced by the climate and the environment. These methods are for reference only.
Fir: After dipping the bases with 50 mg/kg aqueous solutions of indole butyric acid and naphthaleneacetic acid for 30 minutes, the rooting survival rate was about 95%.
Taxus: After immersing for 30 minutes in 200 mg/kg aqueous solution of indole butyrate, the rooting survival rate is about 90%.
Ginkgo biloba: After immersing for 2 hours in the disinfectant disinfectant solution, then 500 mg/l ethanol solution of indole butyric acid and naphthaleneacetic acid were used for rapid growth. The rooting survival rate was about 80%.
Toona sinensis: After immersing each 50 mg/kg aqueous solution of indole butyric acid and indole acetic acid for 30 minutes, the rooting survival rate is about 80%.
Pomegranate: After immersing each 25 mg/kg aqueous solution of indolebutyric acid and indole acetic acid for 2 hours, the rooting survival rate is about 90%.
Kiwi fruit: After immersing in 100 mg/kg aqueous solution of indole butyric acid for 1 hour, the rooting survival rate is about 90%.
Osmanthus fragrans: After immersed in 100 mg/kg aqueous solution of indole butyric acid and indole acetic acid for 2 hours, the rooting survival rate was about 85%.
Smile: When immersed in an aqueous solution of naphthaleneacetic acid 100 mg/kg for 8 hours, the rooting survival rate is about 90%.
Jasmine: immersed in 100 mg/kg aqueous solution of indole butyric acid for 120 minutes. The rooting survival rate was about 90%.
Rose: Mixing mealworms with 1,000 mg each of indole butyric acid and naphthalene acetic acid and 1 kg of talcum powder, the rooting survival rate is about 90%.
Other plant branches, treated with rooting agents, have different degrees of promoting effect on cutting rooting. Readers can use a variety of rooting agents and experiment with different concentrations.
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