There are many kinds of gibberellins, which are often used in agricultural production and have a good effect on stimulating leaves and buds. This article has made an in-depth introduction from the two aspects of the role and use of gibberellin, we can refer to it. The role of gibberellin The most prominent role of gibberellin is to accelerate cell elongation (gibberellin can increase the amount of auxin in plants, while auxin directly regulates cell elongation), which also promotes cell division, which promotes cell Expanded (but does not cause acidification of the cell wall), in addition, gibberellin also has physiological effects of inhibiting maturation, lateral bud dormancy, aging, and tuber formation. Promote the transformation of maltose (inducing the formation of α-amylase); promote vegetative growth (no promotion to root growth, but significantly promote the growth of stems and leaves), prevent organ shedding and break dormancy. 1, the effect of gibberellin on orchids The main function of gibberellin (GA3) is to promote cell elongation, thereby causing the stem to elongate, the plant to increase, and to promote flowering, fruiting and the like. Studies have shown that low concentrations of gibberellin can also effectively regulate orchid flowering, especially for Chunlan. Using 100 mg / liter of gibberellin solution to spray orchid seedlings from May to June, once every 5 to 6 days, for 2 to 3 times, can promote the growth of orchid seedlings. If 2O0 mg / liter of gibberellin solution is used to spray blue plants 3 to 4 times between August and September, each time interval is about 1 week, which can promote the growth of spring orchid buds, and flowering 10 to 30 days earlier than normal, and flowers The posture, color, and floral fragrance are not affected at all. If auxin and cytokinin are combined, the effect will be more obvious. 2, the effect of gibberellin on tomato Gibberellin is sprayed on the top of the tomato (seventh spike) and sprayed with the size of the bean (not suitable for spraying at the flowering stage to prevent the fruit from being poor or the plant length). At this time, the tomato is in the color changing period. The tomato in the middle ear position is in the period of fruit expansion. Spraying gibberellin can play the role of stretching the pericarp cells and promoting the growth of the peel, thus achieving the purpose of preventing cracking. 3. The effect of gibberellin on cotton 1. Promote growth and development to break seed dormancy and promote germination. Soaking cotton with 10~100ppm solution can increase the germination rate and make the cotton seed germination and tidy. The Cotton Research Institute of Shandong Province diluted 90% of the gibberellin powder into 20~100ppm solution for 24 hours, and both emerged 2 days earlier. After 6 days of bud spraying, the height of cotton seedlings increased by 1 cm compared with the control, and the true leaves increased by 0.13. The stems of cotton seedlings were tall and thin. The cotton buds were applied with the drug night, and the average flowering was 3 days earlier than the non-smear. Using 20ppm solution to spread the flowers opened on September 10 (2 days after the white dew), the growth rate of the cotton bolls was accelerated. On November 16th, the average single bell could receive 2.1 grams of seed cotton, while the control cotton bolls with gibberellin were not harvested. 2. Anti-falling bells can be prevented from falling off by using gibberellin spotting or spraying. Install the injection needle with a brush or plastic bottle, apply 20ppm solution to the flower or baby bell, or spray it 3~4 times during the flowering period (spray every 7~10 days), spray it on the flower bell. It can be obvious Reduce boll detachment. The experimental research of the Cotton Research Institute of Shandong Province has the best effect of spot coating. The cost-effective dosage is to prepare 90% gibberellin powder into 10~20ppm solution, first remove the corolla that has just been opened the day before, in the young bell. Apply a drop of solution on the spot, or click on the flower that blooms on the same day, or the big bud that will bloom tomorrow, and apply the young bell handle. Using gibberellin to stimulate cotton flowers and young bells can regulate the movement of nutrients and concentrate more nutrients on the flower bells. From July 10th to September 5th, all the bells were applied with a total of 6.4 bells per plant. According to the test, the high-yield cotton field with a yield of 100 kg of lint per mu was spent 10 times in the flowering and boll period on the same day, and the cotton yield increased by 3 to 5%. The test results show that the cotton field with good fertilizer and water conditions has good coating effect and the effect of thin application is more obvious. If the coated drugs are combined with the management of the enhanced fertilizer and water, the effect of preventing the falling of the bell, increasing the clothing, increasing the fiber, and increasing the yield can be better achieved. However, if the concentration is too large, the amount of coating or spraying solution will be too large, which will result in small bolls, thick bells, late maturity, and poor puncturing. 3. Rescue and control overweight cotton fields using growth inhibitors such as Zhuangsu, causing cotton plants to inhibit excessive weight, slow growth, fruit branches do not stretch, plant type is too compact, flower buds are severely shed, and 30~50ppm gibberellin can be sprayed. Solution, at the same time, strengthen the management of fertilizer and water, can alleviate or reduce the inhibition and restore normal growth. Effect of gibberellin on citrus The gibberellin is used for the preservation of the sugar orange fruit tree, mainly starting about 15 days before the start of the second physiological fruit drop, and then spraying once every 15 days, and spraying continuously for about 2-3 times. It is 20 mg / liter. The second physiological drop generally occurs in mid-May and ends until about the end of June. The principle of using gibberellin is to supplement the deficiency of gibberellin in the plant, thereby inhibiting the synthesis of abscisic acid in the second physiological drop, which forms the separation layer between the fruit pedicle and the fruit stalk. Effect. As for the summer shoots, it is usually taken after mid-May. Because spring shoots, flowers, and young fruits consume a lot of organic nutrients in the tree, if the number of fruits is reasonable (generally 70-80:1 according to leaf-to-fruit ratio), there is no excessive nitrogen in the soil, trees If the potential grows moderately rather than too strong, the summer shoots are generally difficult to extract. Gibberellin use 1. This product can be mixed with common pesticides and can synergistically increase each other. If gibberellin is used in excess, side effects can cause lodging, so it is often adjusted with the helper. Note: It can not be mixed with alkaline substances, but it can be mixed with acidic, neutral fertilizers and pesticides. 2, spraying time is best before 10:00 am, after 3:00 pm, within 4 hours after spraying, it is necessary to re-spray 3. The concentration of the product is high, please prepare according to the dosage. If the concentration is too high, it will appear long and white, until it is deformed or dead, and the effect of too low concentration is not obvious. The amount of liquid used for leafy vegetables varies depending on the size and density of the crop plants, and the amount of liquid per acre is generally not less than 50 kg. 4, gibberellin aqueous solution is easy to decompose, should not be placed for a long time, should be used now. 5, the use of gibberellin can only play a good effect under the conditions of sufficient supply of fertilizer and water, can not replace fertilizer. These items are suitable for Pulbic places. 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