Preparation and use of growth regulators (1)

Some growth regulators are insoluble in water, so different dissolution methods should be used. Indoleacetic acid, indolebutyric acid, naphthylacetic acid and gibberellin can be dissolved in a small amount of 95% alcohol, and then a certain amount of water is added to reach the desired concentration. For the preparation of different concentrations of naphthylacetic acid, please refer to Table 8. Cytokinins such as kinetin and 6-benzyladenine can be dissolved in a small amount of 1 mole of hydrochloric acid, and then a certain amount of water is added to reach the desired concentration. The raw powder of penicillin is insoluble in water, but it should be heated when it is dissolved in triethanolamine, and then diluted with water. The prepared solution should be stored in a 2-4 ℃ refrigerator and then taken out for dilution. Temporarily unused hormone solutions should be preserved in a low temperature and dark place.

There are many ways to use growth regulators, depending on whether they are liquids or powders.

① spraying method

The medicine has a wide contact area, high efficacy and good effect, so it is a very common method to be used.

② dipping method

Used in local treatment, such as to promote the rooting of cuttings, soak them with auxin at the base of cuttings, there are

The advantages of concentrated action and saving medicine.

③ smear method

The use site of the agent can be strictly controlled to avoid diffusion, and it also has the advantage of saving medicine.

④ irrigation method

Using the method of soil irrigation to deal with flowers, because it is easy to disperse and lose, so the medicament is more wasteful.

In the cuttage propagation of flowers, hormones are often used to promote the rooting of cuttings, improve the survival rate, speed up propagation and cultivate strong seedlings.

Deal with it. The hormones that promote rooting include indolebutyric acid (IBA), indoleacetic acid (LAA) and naphthylacetic acid (NAA).

Naphthylacetic acid with stable performance and strong effect is widely used.

There are two treatment methods: soaking in aqueous solution and smearing with powder. Immersion in aqueous solution can be divided into low concentration and high concentration. Low concentration

Soaking in aqueous solution is to soak the cuttings for a long time before cutting. The concentration of all naphthylacetic acid is 10-200 mg.

/ L, the processing time is from 8 hours to 24 hours. Soak the cuttings at 1-2 cm of the incision without soaking the whole cuttings.

Young shoots were treated with weak indole acetic acid, and mature shoots were treated with indolebutyric acid or naphthylacetic acid. High concentration and fast

Dipping treatment can improve work efficiency, the commonly used concentration is 1000-10000 mg / L, dipping for 2-5 minutes. Powder treatment is

First dissolve the agent in a small amount of 95% alcohol, then spread the solution evenly in inert powder such as talcum powder, and then heat it slightly.

To evaporate the alcohol into a powder. Usually 1 gram of talc powder is mixed with 1-20 mg auxin. It will be soaked in water during treatment.

The base of the cuttings can be dipped in the powder, but the concentration of the treatment is 10 times higher than that of solution impregnation.

There are many kinds of flowers, and a small amount of hormones can be used to test them first. In general, the concentration of plants and flowers should be lower.

Woody flowers can be taller. The concentration of soaking for a long time should be lower, and the concentration of rapid soaking should be higher.

The treatment of short and sturdy flowers in flower cultivation is often due to the vegetative growth of the plant is too prosperous, the plant is tall, the branches and leaves are too luxuriant, which affects the reproductive growth such as flowering and fruiting, and greatly affects the ornamental value and the arrangement of flower beds. Therefore, in the cultivation, we all hope that the plants are short and strong, the flowers are dense, and the plants are plump, so as to achieve the desired results. Usually, a variety of growth inhibitors or retarders can be used to inhibit elongation growth and dwarf plant types, so as to improve disease resistance, drought resistance and cold resistance, and promote branching and flower bud differentiation.

After treatment, the chrysanthemum can dwarf the plant, promote branching and concentrate the flowers. The vegetative growth of rhododendron can be delayed after treatment.

To accelerate flower bud formation. After the treatment of pelargonium, the plant height could be reduced by 10 cm, and the flowering was 2 weeks earlier. After dahlia treatment

It can also dwarf the plant and blossom earlier. (Jiang Chengzi)