Gibberellic acid GA3

【1】Chinese common name  Gibberellic acid GA3

【2】English common name  gibberelic acid , berelex , Pro – Gibb (ICI), GA3

【3】Commodity name  GA3, Qibao, 920

【4】Chemical name  2,4α,7﹣trihydroxy﹣1﹣methyl﹣8﹣methylene gibberellin﹣3﹣ene﹣1,10﹣dicarboxylic acid﹣1,4α﹣lactone

【5】CAS No.  77-06-5

【6】Molecular formula  C₁₉H₂₂O₆

【7】Relative molecular mass  346.38

【8】Physical and chemical properties

Pure product is white crystal, melting point is 233~235℃, easily soluble in alcohol, acetone, ethyl acetate, sodium bicarbonate solution and pH=6.2 phosphate buffer, insoluble in water and ether. The aqueous solution is acidic, unstable and easy to fail, and easy to decompose in case of alkali.

【9】 Toxicity Low toxicity

【10】Main dosage forms

90%, 95% Gibberellic Acid Original Drug, 75%, 85% Gibberellic Acid Crystalline Powder, 4%, 10%, 20%, 40% Gibberellic Acid Soluble Powder, 2.7%, 3%, 4.1% Gibberellic Acid Acid cream, 40% gibberellic acid water-soluble tablet, 70% gibberellic acid wettable powder, 4% gibberellic acid EC, etc.

【11】Features

Gibberellic acid, a kaurine compound, is a broad-spectrum and efficient plant growth regulator. It is ubiquitous in plants and is one of the important endogenous hormones that promote plant growth and development. Gibberellic acid mainly enters the plant body through leaves, twigs, flowers, seeds and fruits, and then conducts to the active parts of growth. Gibberellic acid has a variety of physiological functions: promote cell and stem elongation, leaf expansion, parthenocarpy, fruit growth, break seed dormancy, change the ratio of male and female flowers, affect flowering time, and reduce flower and fruit shedding.

【12】Applied technology

Break dormancy and promote germination

Rice

Soak the seeds with 10~50mg/L gibberellic acid solution for 24h before sowing, the ratio of the solution volume to the seed volume is 1:0.8, and turning it several times during this period can improve the germination rate and germination potential of rice, and the germination is neat.

Wheat

Soak the seeds with 10~50mg/L gibberellic acid liquid for 6~12h before sowing, the ratio of liquid to planting quantity is 130.8, and sowing after drying in a cool place can improve the germination rate and germination potential of wheat, and the germination is neat.

Corn

Soak the seeds with 10~20mg/L gibberellic acid solution for 2 hours before sowing. After soaking, dry the seeds in a cool place for 10 days before sowing, which can make the seedlings emerge early and homogeneous, and increase the dry weight and emergence rate of seedlings.

Sorghum

Soaking seeds with 5~10mg/L gibberellic acid solution for 12~24h can promote germination, stimulate hypocotyl elongation and increase dry weight, and seedlings emerge significantly earlier.

Potato

Potato cut into pieces and soaked in 0.5~2mg/L gibberellic acid solution for 10~15min, or soaked whole potato in 5~15mg/gibberellic acid solution for 30min, can relieve the dormant period of potato tubers, germinate early, and induce lateral buds. The growth of young shoots is accelerated, stolons occur earlier, and the expansion period of tubers is prolonged, which can increase yield by 15% to 30%. (Note: varieties with short dormancy periods use lower concentrations, while varieties with long dormancy periods use higher concentrations.)

Sweet potato

Soak the potato pieces in 10~15mg/L gibberellic acid dilution solution for 10 minutes, remove them and dry them, and then raise seedlings in hotbeds, which can break the dormancy period and emerge early.

Soybean

Soaking seeds with 3.5mg/L gibberellic acid solution for 2 hours can effectively speed up the initial germination rate of spring sowing soybeans at 10~15℃, significantly accelerate the growth rate of young roots, and increase the fresh and dry weights of young roots.

Rape

Before transplanting rapeseed, dip the seedling roots with 20mg/L gibberellic acid liquid, which can promote the early development of plants and increase the yield; spray 20-25mg/L gibberellic acid liquid on the leaves at the full flowering stage, which can improve rapeseed rate.

Cotton

Soaking seeds with 20mg/L gibberellic acid solution for 6-8 hours can reduce the phenomenon of delayed germination or rotten seeds caused by adversity such as low temperature, and promote seed germination.

Camellia

Soaking seeds with 20mg/L gibberellic acid solution for 4 hours can speed up the germination rate.

Eggplant

The low-concentration gibberellic acid solution can break the shallow dormancy of eggplant seeds and improve the germination potential and germination rate of the seeds; among them, 50~100mg/L gibberellic acid solution at room temperature for 8 hours has the best effect. For eggplant varieties with moderate dormancy, such as “Liaojiao No. 1”, “Liaojiao No. 5” and “Xi’an Green Eggplant”, hormones must be used to break seed dormancy regardless of germination test or seedling raising. Gibberellic acid liquid treatment for 24h can achieve better results.

Lettuce

Planting with 200mg/L gibberellic acid solution for 24h can promote the lettuce to go dormant and germinate earlier.

Wolfberry

Soaking seeds with 300mg/L gibberellic acid solution for 24 hours, and then washing and sterilizing treatment, can improve the germination rate of seeds, and has a significant promoting effect on seedling height, leaf number, leaf length, soluble protein content, etc.

Strawberry

In strawberry semi-promoting cultivation, spraying 8~10mg/L gibberellic acid liquid in the early stage of growth can make the first inflorescence bloom earlier: in strawberry greenhouse cultivation, after 3 days of heat preservation (that is, more than 30% of flower buds appear) time) spray gibberellic acid liquid 1-2 times, spray the first time when the two leaves are not unfolded, and spray the second time in the budding stage as appropriate. The concentration of the liquid is 5~10mg/L. The spray heart leaves can make the top inflorescence bloom in advance, promote growth, and mature earlier. (Note: The concentration is different for different varieties. The varieties with shallow dormancy use low concentration, the varieties with deep dormancy use high concentration, and the varieties that grow normally in the early stage of growth do not need to be sprayed.)

Ulam

Using 50~200mg/L gibberellic acid liquid to treat the seeds of Wulan for 4 hours has a good effect on breaking the shallow dormancy of Wulan, and can shorten the germination days, improve the germination rate, and make the germination uniform and treated Wulan seeds. The growth and development of seedlings were not adversely affected.

Sanqi

Irrigation with 10-20mg/L gibberellic acid on the day after transplanting can shorten the dormancy time of the dormant buds of Panax notoginseng and improve the emergence rate, but the emerging plants are prone to leggy phenomenon.

Ginseng

Soaking seeds with 20mg/L gibberellic acid solution for 15min can increase the germination rate of ginseng.

Nasturtium

Seeds soaked in 100mg/L gibberellic acid solution for 3~4d at room temperature can promote germination.

Rose

Dip the roots with 100~300mg/L gibberellic acid solution for 5s before planting roses, which can improve the germination rate and increase the growth of single branch and single plant.

Peony

If the peony still does not germinate or germinate about 20 days after entering the greenhouse, it means that it has not been able to release dormancy naturally. At this time, it can be treated with gibberellic acid to promote its germination and germination, and achieve the purpose of early flowering (do not use it when the peony first enters the greenhouse. All plants were treated with gibberellic acid). The appropriate concentration of gibberellic acid is 800~1000mg/L. The method is to wrap the flower buds with absorbent cotton first, then drip gibberellic acid on the absorbent cotton with a brush, and treat it once a day at 5-6 pm for 3-4 consecutive times. The number of times should not be too much, otherwise it is easy to develop into deformities.

Cyclamen

Soak cyclamen seeds with 100mg/L gibberellic acid solution for 24h, which can germinate early and make them germinate neatly.

Cuckoo

Soaking seeds with 100mg/L gibberellic acid solution for 24 hours can break the dormancy of Rhododendron (light-loving) seeds.

Mulberry

In the hibernation period, treatment with 1~50mg/L gibberellic acid liquid can make germination and flowering 2~6d earlier, can significantly earlier germinate and open leaves, increase the germination rate and flowering number, can relieve mulberry dormancy, and make winter buds appear early.

Qinghai Spruce

Soaking seeds with 500mg/L gibberellic acid solution for 24 hours can relieve Qinghai spruce seed dormancy and promote seed germination and growth.

bermudagrass

The seeds of Bermudagrass were soaked with 5mg/L gibberellic acid solution for 24h, which could significantly promote the germination.

Zoysia

Soaking seeds with 40~160mg/L gibberellic acid solution for 24h can effectively relieve the dormancy of Zoysia seeds and significantly improve their germination rate.

Lavender

Soaking lavender seeds with 550mg/L gibberellic acid for 4h can increase their germination rate and germination potential.

Protect flowers and fruits, and promote the development of flowers and fruits

Tomato

Using 30～35mg/L gibberellic acid liquid to spray flowers once during the flowering period can improve the fruit set rate and make the fruit in air-raid shelters.

The eggplant is sprayed with 25-35mg/L gibberellic acid liquid once during the flowering period, which can prevent flower drop, promote fruit setting and increase yield.

Grape

Generally, before flowering (inflorescence length is 5-7cm), the inflorescence of the varieties that need to be stretched is dipped in 5-10mg/L gibberellic acid liquid, which can significantly lengthen the grape inflorescence, reduce fruit thinning labor, and shape the panicle shape; 3 days after flowering, dipping or spraying fruit ears with 10-25mg/L gibberellic acid can significantly improve the fruit setting rate, reduce flower and fruit drop, and promote the seedless grapes; about 10 days after flowering, when the size of peanut grains in some varieties, choose 13 ～50mg/L gibberellic acid and other chemical combination dipping or spraying the ear can significantly promote the expansion of grape fruit and increase the yield. Different grape varieties use different techniques. For example, “Kyoho” grape varieties (“Kyoho”, “Jingya”, “Hutai No. 8″), before flowering (inflorescence length 5-7cm), can use no more than 5mg/L gibberellic acid solution to dip the fruit ear, which can help Effectively promote inflorescence elongation; 10-25mg/L gibberellic acid solution can be used for ear spraying or ear dip treatment during the full bloom period to the end of full bloom, which can improve the fruit setting rate by 10% to 20%, and can increase the seedless rate by about 30%, reaching 66%. %, which has little effect on later coloring and quality; when the size of young fruit soybeans, 16-30mg/L gibberellic acid solution is selected to soak the ear, which can effectively promote cell expansion, increase the weight of fruit grains, and improve the commercial characters of grapes.”Xiahei” grape varieties, before flowering (inflorescence length 5-7cm), can use 5-10mg/L gibberellic acid solution to dip the fruit ear, which can effectively promote inflorescence elongation; 10-25mg can be selected from full bloom to full bloom ／L gibberellic acid solution spraying or dipping the ear can improve the fruit setting rate by about 20%, effectively preventing the flower and fruit from falling; when the young fruit is the size of soybean, choose 20～50mg/L gibberellic acid solution to dip the ear, which can effectively promote cell expansion , increase the weight of fruit and improve the commodity characters of grapes. “Hongti” grape varieties, when the young fruit soybeans are up to the size of peanuts, can be dipped or sprayed with gibberellic acid solution with a concentration of no more than 15mg/L, which can effectively promote fruit expansion. “Rose Fragrance” grape variety, before flowering (inflorescence length 5-7cm), the concentration of gibberellic acid can be dipped in the fruit ear with a concentration of no more than 5mg/L, which can effectively promote inflorescence elongation; 15-22mg can be selected about 5 days after full bloom 10-30mg/L gibberellic acid solution dipped in the ear to promote fruit preservation and effectively prevent fruit drop; when the young fruit is the size of soybean, choose 10-30mg/L gibberellic acid solution to dip the ear, which can effectively promote the expansion of fruit grains and improve the commercial character of grapes ,increase output.

Tangerine

Spraying 25-50mg/L gibberellic acid liquid 7d after flowering and after the first early physiological fruit drop to before the second physiological fruit drop can promote the preservation of flowers and fruits. (Note: ① It can be mixed with cytokinin to improve the fruit retention rate of the first physiological fruit drop; ② When using gibberellic acid in Wenzhou mandarin, it should be sprayed in advance from the end of full bloom to the time when the flowers are withered; ③ When spraying, in red Adding 0.2% urea, 0.2% potassium dihydrogen phosphate and 0.2% borax to the mycolic acid solution can improve the effect of preserving flowers and fruits; ④ In case of high temperature and dry weather during the flowering and fruit period, the use of gibberellic acid should be combined with proper watering of the orchard to prevent Improve the effect of preserving flowers and fruits.)

Kiwi

2% gibberellic acid lanolin coated pedicels can significantly reduce the number of seeds of kiwi fruit, induce the formation of seedless fruit, and reduce the rate of fruit abscission.

Chili

Using 20-40mg/L gibberellic acid liquid to spray flowers once during the flowering period can promote fruit setting and increase yield.

Watermelon, Winter Melon, Pumpkin, Cucumber

Spraying 20～50mg/L gibberellic acid liquid once in flowering period or once in young melon stage can promote the growth and yield of young melon.

Jujube

During the full bloom period (40% to 50% of the flowers), spray 20-25mg/L gibberellic acid liquid 1-2 times with an interval of 5-7 days, which can promote fruit setting and make fruit set neatly. (Note: ①When spraying, it is required to spray evenly on the whole tree, and the amount of spraying is about the degree of dripping water from jujube leaves; ②If it is mixed with naphthalene acetic acid and urea, the effect is better; ③For different varieties, the use period, concentration and frequency of use are different. difference.)

Apple

Spraying with 10-30mg/L gibberellic acid solution in the flowering period of “Red Fuji”, “Guoguang”, “Marshal” and other varieties can improve the fruit setting rate of apples in the current year and effectively inhibit the excessive formation of flower buds in the next year.

Pears Spraying 10-25mg/L gibberellic acid liquid in the pear blooming stage and young fruit stage can improve the fruit setting rate of pears, and can increase the yield of pear varieties such as “Jingbai pear”, “Yang pear” and “Dangshansu pear”. Function; spray 50-100mg/L gibberellic acid liquid on the crowns of “Mantianhong Pear” and “Meirensu Pear” one month before harvest, which can effectively prevent fruit drop before harvest.

Peach

Spraying 10-80mg/L gibberellic acid solution 15-20d after flowering can improve the fruit set rate and promote fruit enlargement for old and weak trees. Young fruit trees and prosperous trees should not be used, otherwise it is easy to cause prosperous new shoots and aggravate physiological fruit drop.

Cherry

Spraying 20-40mg/L gibberellic acid liquid in full bloom, or spraying 10mg/L gibberellic acid liquid 10 days after flowering can significantly improve the fruit set rate. Spraying 5-10mg/L gibberellic acid liquid once 20 days before harvest can significantly reduce cherry fruit rot and peel cracking, and improve the quality of fruit products.

Apricot

5 to 10 days after flowering, spraying 10-50mg/L gibberellic acid liquid can improve the fruit setting rate of most apricots, and spraying with 1% sucrose and 0.2% potassium dihydrogen phosphate liquid has better effect.

Bayberry

When the young trees are in full bloom or withered, spray 15-30mg/L gibberellic acid liquid once on the crown of the tree, which can increase the fruit setting rate by 20%-30%.

Mango

When the young mango fruit is as big as an olive, spraying with 25-40 mg/L gibberellic acid twice, with an interval of 10-15 days, can promote the fruit set rate, increase the single fruit weight and the vertical and horizontal diameter of the fruit, and increase the yield.

Loquat

In the young fruit stage, spraying 10mg/L gibberellic acid solution on foliage and fruit can increase the fruit set rate by 40%, and after spraying gibberellic acid, some seedless fruits can be formed and the fruit quality can be improved.

Hawthorn

Spraying 50～60mg/L gibberellic acid liquid in flowering period can greatly improve the fruit set rate, at the same time increase fruit vitamin C, reduce fruit firmness, and advance the coloring period and ripening period by 5 to 10 days. When spraying 20-50mg/L gibberellic acid liquid in full bloom and young fruit stage, the average fruit weight increases by 20%-25%.

Persimmon

In the flowering stage and young fruit stage, spraying 30-50mg/L gibberellic acid liquid can significantly improve the fruit setting rate and reduce fruit drop.

Pineapple

Generally, gibberellic acid is used to spray fruit twice. The first time is to spray 40-50 mg/L gibberellic acid liquid when the florets are half open, and the second time is to spray 70-80 mg/L gibberellic acid liquid after the flowers are withered. It can significantly increase the yield and delay the maturity period by 7-10d.

Litchi

Spraying with 20mg/L gibberellic acid solution 30d after blooming can reduce fruit drop, increase fruit set and increase yield.

Enoki mushroom

When each flush mushroom grows to the stage of fruiting body formation, spraying with 10 mg/L gibberellic acid solution at the budding, Qiying and mushroom stalk elongation stages can promote early fruiting, increase the number and yield of fruiting bodies, and improve the color and luster. The uniformity is improved, and the compounding effect with 0.5mg/L triacontanol is better.

Cineraria

When the diameter of potted cineraria chrysanthemum buds is 4-5mm, spraying 500-1000mg/L gibberellic acid liquid can significantly speed up the opening of the top buds, and spraying 100mg/L gibberellic acid liquid during color development can make the whole plant bloom. significantly earlier.

Chunlan

From late August to early September, spray the whole plant of Chunlan with 200mg/L gibberellic acid 3 to 4 times (7d interval), which can promote the growth of flower buds and bloom earlier (10 to 15d earlier than the normal flowering period).

Peony

After some peony varieties germinate in the greenhouse, the leaves grow faster than the flower buds, such as “Yingluo Baozhu”, “Oolong Pengsheng”, “Zi Erqiao”, “No. The phenomenon of “leaf eating flowers” causes flower buds to be aborted. When the peony stem is elongated to 1-10cm, apply 100-300mg/L gibberellic acid solution (preferably mixed with spreading agent) on the young buds and the tender stems at the base, once a day in the morning and evening, continuously. 3 ~ 5d can be. The growth rate of flower buds of some varieties may be faster than that of leaves, such as “Dahuhong”, “Pingshiyan”, “Linghua Zhanlu”, “Zhaofen”, “Meat Hibiscus”, etc. When the temperature is high, it is easy to cause the so-called “dead branches of peony”. To affect the ornamental effect, when the compound petiole is elongated to 1-5cm, apply 500-800mg/L gibberellic acid liquid to the petiole with a brush, once a day in the morning and evening, for 3-5 days. If you brush the leaflets at the same time, it can promote the expansion of the leaflets, and the effect is better.

Relieve aging and preserve freshness

Cucumber

Before harvesting, soaking with 80mg/L gibberellic acid liquid for 30s can well maintain the vitamin C content of cucumbers, has a fresh-keeping effect, and better maintains the nutritional value and storage quality of cucumbers.

Tomato

Soaking in 173mg/L gibberellic acid solution for 30min after harvest can effectively alleviate the symptoms of chilling injury of tomato fruit, protect the microstructure of cells, inhibit the increase of malondialdehyde content and ion permeability, and increase the activities of PLC, PLD, LOX and PG , thereby improving the cold resistance and storage ability of postharvest tomato fruit.

Watermelon

Before harvest, spray the melon with 25~35mg/L gibberellic acid liquid once, which can prolong the storage period.

Garlic

Soak its base with 40~50mg/L gibberellic acid solution for 10~30min, which can inhibit the upward transportation of organic substances and play a role in preservation.

Flowers

20~35mg/L gibberellic acid liquid can promote the flowering of Carnation and Tangchangpu cut flowers after storage. 1mg/L gibberellic acid treatment could prolong the lifespan of cut violet flowers. 100~400mg/L gibberellic acid liquid treatment can significantly prolong the vase life of the cut flowers of Hippeastrum chinensis.

Promote growth and increase yield

Wheat

Spraying 10~20mg/L gibberellic acid solution on wheat at the turning green stage can reduce the late ineffective tillering and improve the panicle rate; At the jointing stage of wheat, spraying 40mg/L gibberellic acid solution on the leaves can increase the number of grains per ear and 1000 grain weight.

Rice

Spraying 10mg/L gibberellic acid solution at the end of effective tillering period of rice can control the occurrence of tillers, reduce ineffective tillers, and promote the growth of main stems and large tillers; Spraying 25~37.5mg/L gibberellic acid solution on the leaves from the beginning of heading to the full heading stage can promote heading, improve the ear forming rate, improve the seed setting rate and 1000 grain weight, and increase the yield.

Celery

15~30 days before the harvest of celery, spray 40~60mg/L gibberellic acid solution once for 3~4 days, a total of 2 times, which can increase the yield by more than 25%, and the stems and leaves are hypertrophy, which can be put on the market 5~6 days earlier.

Spraying 10~25mg/L gibberellic acid solution for 3~5d for 1~3 times 20 days before spinach harvest can promote leaf hypertrophy and increase yield.

Cauliflowe

When cauliflower has 6~8 leaves and the diameter of the stem reaches 0.5~1cm, spray the plant with 100mg/L gibberellic acid solution, which can form flower bulbs early and harvest 10~25 days in advance. Especially for late maturing varieties, the effect is more remarkable.

Leek

When the leek is 10cm high or 3 days after harvest, spraying 20mg/L gibberellic acid solution can increase the yield by more than 15%.

Strawberry

After strawberry harvest, the stems and leaves gradually grow vigorously. Spraying 50mg/L gibberellic acid solution on annual plants in June or twice in June and July can promote the occurrence and growth of stolons.

Tea

At the initial stage of tea bud germination, spray 50~100mg/L gibberellic acid solution on the leaf surface, and spray it once after an interval of 15~20days, which can promote tea bud germination, and the development period of one bud and two leaves is advanced by about 5 days. When the temperature is low in spring, the concentration of gibberellic acid can be appropriately higher; The temperature is higher in summer and autumn, and the concentration should be appropriately lower.

Sugarcane

From the end of tillering to the beginning of jointing, sugarcane is sprayed with 40~50mg/L gibberellic acid solution of 25~30kg per mu, and then sprayed once every 15days, a total of 2~3times. Generally, for the first planted sugarcane field with good fertility, spray 1~2times; For the fields with poor fertility and planted sugarcane for many years, it is appropriate to spray three times, which can adjust the physiological function of sugarcane, improve the carbon nitrogen ratio of plants, improve the efficiency of photosynthesis, accelerate the growth of sugarcane stems, and the effect of sugar increase is remarkable.

Tobacco

After the tobacco is cultivated in the large seedling stage, spray the leaf surface with 15mg/L gibberellic acid solution, and spray it again at an interval of 5 days, which can promote the metabolism of carbon and nitrogen, increase the content of nicotine and potassium, reduce the content of nitrogen, improve the quality of tobacco leaves, increase the proportion of medium and high-grade tobacco leaves by 9%, increase the area of tobacco leaves, enhance the light intensity of leaves, significantly increase the weight of single leaves and leaf quality, and increase the yield of tobacco leaves by 20%.

Ramie

Ramie treated with 20~100mg/l gibberellic acid solution can promote growth and yield. Spraying at a plant height of about 1m and spraying again every 10days can promote the growth of ramie, and the population growth is consistent. The plant height, stem diameter, fresh skin weight, hemp yield, dry fiber length and fiber yield per plant are increased, among which 100mg/L gibberellic acid has the highest yield.

Alfalfa

Spraying 25 ~ 100mg/L gibberellic acid solution on the leaves of Alfalfa during the growth period, low concentration can significantly improve the plant height and dry and fresh weight, and high concentration can also increase the protein content of stems and leaves. Spraying wine with 10mg/l gibberellic acid solution in early spring can promote the growth under low temperature and make the leaves green.

Mushroom

The fruiting body of mushroom can be increased and the yield can be increased significantly by dipping 350~400mg/L gibberellic acid solution into the leaching block when the primordium is formed.

Rose

After the germination of rose, spray the growth point with 10~100mg/L gibberellic acid solution once, which can significantly promote the growth.

Mulberry

Use 30~100mg/L gibberellic acid, and spray 50kg liquid medicine on each mu of leaves. Spraying mulberry leaves once every 7~10 days after harvest can promote the growth of stems and leaves, expand the photosynthetic area, and improve the assimilation ability. The fresh weight and dry weight of mulberry leaves treated with gibberellic acid increased, the sugar content decreased slightly, but the protein content increased, which was more suitable for silkworm feed. When applied, one time of quick acting nitrogen fertilizer can be applied correspondingly to increase its marketability.

Mongolian Scotch pine, spruce

Soaking seeds of Pinus sylvestris var. mongolica and spruce with 50~100mg/L gibberellic acid solution for 24 hours can promote the growth of seedlings of Pinus sylvestris, Picea ichthyosana and Picea koraiensis, and significantly increase plant height, root volume and dry matter accumulation. At the same time, gibberellic acid can regulate the metabolism of three coniferous seedlings, improve the activities of dehydrogenase and nitrate reductase, and increase the contents of soluble sugar, soluble protein and free amino acids.

Kentucky bluegrass

Spraying Kentucky bluegrass with 30~50mg/L gibberellic acid solution on the leaves, combined with water and fertilizer management, can speed up the growth of the lawn and complete the rejuvenation process early.

Tiantangcao and Manila grass

Tiantangcao and Manila grass are sprayed with 25~50mg/l gibberellic acid solution at the tillering stage, and then sprayed once after 10days, which can significantly promote the elongation and tillering of stolons, shorten the days of turf formation, and increase the grass clump, coverage and leaf color in terms of turf quality. The decomposition rate of chlorophyll and protein of the two turfgrass was slow, and the activity of superoxide dismutase increased, so as to delay the aging of turfgrass and prolong the green period of turfgrass.

Improve seed production

Cucumber

When making cucumber seeds, spraying the gibberellic acid solution with a concentration of 50-100mg/L when the seedlings have 2-6 true leaves can reduce female flowers and increase male flowers, making female cucumbers hermaphroditic, meeting the needs of seed production. ,Increase production.

Rice

The physiological characteristics of the female parent (sterile line) in the seed production field are serious. After spraying gibberellic acid, the exposure rate of the stigma can reach 95% left stone, and the angle of the flag leaf is significantly increased, which makes the ear part obviously protrude the leaf layer, thereby increasing the Probability of pollination, resolving sac neck. Adjust the height ratio of the parental plant and the probability of meeting the flowering period, and improve the seed setting rate and yield of seed production. Generally, spray 2~3 times in a row, spray when 5%~10% of the head of the female parent is mastered for the first time, and use 1~2g of gibberellic acid per mu, 3~4g for the second time, and the third time depending on the mother parent. Depends on the degree of neck elongation. Generally, the total amount of 3 times is 12~16g.

Promote bolting flowering

Celery, carrots, carrots, Chinese cabbage, cabbage and other vegetables

For vegetables that require low temperature vernalization to bolt and bloom, gibberellic acid can be used to induce the completion of the vernalization stage. Spraying plants with 50~500mg/L gibberellic acid solution or dripping growth points can make two-year-growing sunshine crops bolt early under short-day conditions before overwintering.

Peonies, roses, lilies, cyclamen and other flowers

After the peach stage of peony, if you want to advance the flowering period, you can evenly apply 300~500mg/L gibberellic acid solution on the flower buds on the basis of raising the temperature, once a day in the morning and evening, for 3~5d. If the leaves are still too small during this time, 100mg/L gibberellic acid solution can also be used to spray the whole plant to achieve the purpose of promoting leaf growth and early flowering. In the leaf-opening stage of roses, spraying the whole plant with 100mg/L gibberellic acid liquid can bloom about 6 days earlier, but the flowering period may be shortened. The musk lily was treated with 2500mg/L gibberellic acid solution and stored at 21℃ for 42d, which could germinate and flower 10d earlier. Using 10mg/L gibberellic acid liquid, 50~60d before expected flowering, spray cyclamen flower buds at a dosage of 3~4mL/plant, which can promote the flowering period, but remember not to spray on the leaves, so as not to cause the leaves to grow too long.

Refractory agent as inhibitor

It is mainly used to relieve the phytotoxicity caused by excessive use of inhibitors such as paclobutrazol, chlormethalin, etc. For example, rice is caused by the overuse of paclobutrazol or the late period, resulting in delayed and uneven ear emergence, etc., 5~20mg/ L gibberellic acid liquid spray is released.

【14】Notes

①Gibberellic acid cannot replace fertilizer. After the application of gibberellic acid, the growth of various tissues and organs of the plant is accelerated, and the consumption of nutrients and water is large.

②Appropriate concentration should be adopted according to the type and variety of vegetables. Different species and varieties of vegetables have different sensitivity to gibberellic acid. If the concentration is too high, it will appear leggy, the stems and leaves will be slender and fragile, the leaf color will turn yellow and the taste will be weak, and the edible quality will be reduced until deformed or withered; if the concentration is too low, the effect will not be obvious. For fruits and vegetables, spray flowers and young fruits are the main parts. The dipping treatment should be uniform, otherwise the growth rate of different parts may be inconsistent, resulting in fruit bending and deformity, reducing the commodity value. For leafy vegetables, the method of spraying the leaves of the whole plant is generally used. The dosage should be determined according to the size and density of the hawthorn plant. It should be sprayed with a sprayer in the evening or morning when the dew is dry, and the leaves of the whole plant are moistened. should.

③Different types of vegetables and different usages under different conditions. Leafy vegetables with a short growth period should be applied in the early stage; stem and leaf vegetables with a long growth period and easy bolting should be applied in the later stage of growth. Vegetables that eat sedges can be properly applied early to promote the occurrence of bolting and side shoots. In the case of high temperature, the effect of gibberellic acid occurs faster, but the duration of efficacy is short. At lower temperatures, plants respond more slowly to gibberellic acid, but the effect lasts for a correspondingly longer time. In winter, it should be applied early in low temperature conditions; in summer, when the temperature is higher, it should be delayed, and it is appropriate to deal with it near the harvest period.

④ It can be mixed with acidic and neutral fertilizers and pesticides, but not with other alkaline substances. Mixing with urea has a better effect of increasing production.