Gibberellic Acid CAS 77-06-5 GA3

One of the most famous impact of gibberellin is to increase cell prolongation (gibberellin can enhance the content of auxin in plants, as well as auxin directly controls cell elongation), and also it can additionally promote cellular division. It can advertise cell growth Expand (however not trigger acidification of cell wall surface), additionally, gibberellins also have physiological results of preventing maturation, lateral bud inactivity, senescence, as well as tuber development. Advertise the conversion of maltose (induce the development of α-amylase); advertise vegetative growth (do not advertise the development of origins, however considerably promote the development of stems and also leaves), protect against body organ losing and break dormancy, etc.

The main function of gibberellin (GA3) is to promote cell elongation, thereby elongating the stem, increasing the height of the plant, and promoting flowering and fruiting. Studies have shown that low concentrations of gibberellin can also effectively regulate the flowering period of orchids, especially for spring orchids. Use 100 mg/L gibberellin solution to spray the orchid seedlings between 5 and 6 months, once every 5 to 6 days, 2 or 3 times in a row, which can promote the growth of orchid seedlings. If 200 mg/L gibberellin solution is used to spray orchid plants 3 to 4 times during August to September, with an interval of about 1 week each time, it can promote the growth of spring orchid flower buds, and bloom 10 to 30 days earlier than normal, and the flower The appearance, color and fragrance of flowers will not be affected in any way. If auxin and cytokinin can be used in combination, the effect will be more obvious.

Gibberellin is sprayed when the top ear fruit (the seventh ear fruit) of the tomato is sitting and has the size of a bean (it is not suitable to spray during the flowering period to prevent poor fruit setting or excessive plant growth), and the bottom ear tomato is in the veraison period. Tomatoes in the middle ear position are in the fruit expansion stage. Spraying gibberellin can stretch the pericarp cells and promote the growth of the pericarp, thereby achieving the purpose of preventing fruit cracking.

1. Promote growth and development Break seed dormancy and promote germination. Soaking cotton seeds with a solution of 10-100ppm can increase the germination rate and make the cotton seeds germinate and emerge neatly. Shandong Cotton Research Institute diluted 90% gibberellin raw powder into 20-100ppm solution to soak cotton seeds for 24 hours, and seedlings emerged 2 days in advance. 6 days after spraying at the bud stage, the height of cotton seedlings increased by 1 cm compared with the control, the number of true leaves increased by 0.13, and the stems of cotton seedlings were tall and thin. Cotton buds were smeared with medicine at night, and they bloomed 3 days earlier on average than those without smearing. Use 20ppm solution to smear the flowers that bloomed on September 10 (2 days after Bailu), the growth rate of cotton bolls is accelerated, and the average single boll can harvest 2.1 grams of seed cotton on November 16, while the control cotton bolls that do not apply gibberellin have no harvest.
2. Anti-falling bolls Use gibberellin to spot or spray to prevent cotton buds from falling off. Install the injection needle with a brush or plastic bottle, apply 20ppm solution on the flowers or young bolls, or spray 3~4 times during the flowering and boll stage (spray once every 7~10 days), and spray on the flowering bolls. It can significantly reduce the shedding of cotton bolls. According to the experimental research of Shandong Cotton Research Institute, spot coating has the best effect, and the economical and effective dosage is to prepare 10-20ppm solution of 90% gibberellin raw powder, remove the corolla that just opened the day before, Apply a drop of the solution on it, or you can spot the flowers that bloom that day, or the big buds that will bloom tomorrow, or apply some young bell handles. Using gibberellin to stimulate the flowers and young bolls of cotton can regulate the operation of nutrients, so that more nutrients can be concentrated on the flower bolls. From July 10th to September 5th, the young bolls were sprayed all over, and each plant produced 6.4 more bolls than the control on average. According to experiments, in a high-yield cotton field with a yield of 100 kilograms of lint per mu, if flowers are bloomed 10 times a day during the flowering and boll stage, the cotton yield will increase by 3-5%. The test results prove that the cotton field with good fertilizer and water conditions has a good effect of spot application, and the effect of application on thin land is more obvious. If some medicine is applied in conjunction with strengthening fertilizer and water management, the effects of preventing bolls from falling, improving clothing percentage, increasing fiber and increasing yield can be better exerted. However, if the concentration is too high, too much solution is applied or sprayed, it will also cause small cotton bolls, thick boll skin, late maturity, and poor boll opening.
3. Rescue excessive chemical control of cotton fields using growth inhibitors such as booster, resulting in excessive inhibition of cotton plants, slow growth, fruit branches not elongated, overly compact plant type, severe flower bud shedding, you can spray 30~50ppm gibberellin solution, At the same time, strengthening fertilizer and water management can alleviate or reduce the inhibitory effect and restore normal growth.

Gibberellin is used to preserve the fruit of Shatangju fruit trees, mainly starting about 15 days before the second physiological fruit drop, and then spraying once every 15 days, continuous spraying about 2-3 times, the use concentration is general 20 mg/L. The second physiological fruit drop generally occurs in early and mid-May, and basically ends at the beginning of late June. The principle of using gibberellin is to supplement the insufficient amount of gibberellin synthesis in the plant, thereby inhibiting the synthesis of abscisic acid that causes the second physiological fruit drop, the fruit pedicle and the fruit stalk form a separation layer, so as to preserve the fruit. Effect. As for the summer shoots, they are usually drawn after mid-May. Because spring shoots, flowers, and young fruits consume a lot of organic nutrients in the tree, if the number of remaining fruits is reasonable (generally according to the leaf-to-fruit ratio of 70-80:1), and there is no excessive nitrogen retention in the soil, the tree will If the potential growth is moderate and not too vigorous, the summer shoots are generally difficult to extract.