The application of synthetic plant hormones to promote the rooting of cuttings, especially on those trees with difficult rooting, plays a great role in promoting rooting and survival.

Main types of rooting plant regulators

1. Indobutyric acid and its homologues indole acetic acid and indole propionic acid have similar effects on stimulating plant growth. At present, the main use of these chemicals is to promote the rooting of branches.

2. Naphthylacetic acid and its derivative sodium naphthylacetate are easy to synthesize and low in cost. Naphthoic acid is insoluble in water, while its sodium salt or potassium salt is easily soluble in water, and sodium salt is generally used in production. Naphthoic acid has a good effect on promoting rooting of cuttings.

3. ABT rooting powder is an efficient and broad-spectrum rooting promoter. It not only supplements the exogenous auxin and other related substances needed for the formation of adventitious roots in cuttings, but also promotes the synthesis of endogenous auxin in cuttings.

Usage of rooting plant conditioner

There are two main dosage forms used in production: powder and water.

1. The powder is easy to use, but it is difficult to prepare, so it is not widely used in production. At present, the ABT film agent rooting powder sold on the market is convenient to use and can be dipped at any time, becoming a commercial powder preparation. In order to evenly apply the medicine at the base of the cuttings, when dipping the medicine in bundles, the branches can be leveled first, the powder can be spread on the plane, and then the cut of the cuttings can be easily stained with the powder.

2. It should be noted that IBA is insoluble in water, its potassium salt can be directly soluble in water, naphthoic acid is only soluble in boiling water or alcohol, and its sodium salt can be directly soluble in water. The preparation method of 1000 ml of 500 μ l/l growth regulator: dissolve 0.5 g of naphthoic acid in 100 ml of 50% alcohol, add 950 ml of distilled water after dissolution, shake well, and put it into a tea-colored grinded bottle for standby.

Dilute solution immersion method: It is an old method. The range of using growth regulators is from 20 μ l/L to 200 μ l/L, and soaking the base of cuttings for 24 hours is time-consuming.

Concentrated solution dipping method: It is a widely used method at present. The concentration of growth regulator used is 500 μ l/L to 1000 μ l/L, rapid dipping, and the effect is very good.

The principle of using the concentration of growth regulator is: the concentration of immersion method is low, and the concentration of quick dip method is high; The concentration of easy-rooted species is low, and that of hard-rooted species is high; The concentration of softwood cutting is low, and that of hardwood cutting is high.

In addition, it should be noted that different growth regulators have different effects on different types of tree species. For example, IBA has a better effect on the rooting of deciduous tree cuttings, while NAA has a better effect on the cutting of evergreen trees.

(The article is from the Internet and is only used for learning and exchange)