Strawberries are perennial herbs with high economic value and good benefits, especially strawberries in off-season facilities, which are supplied to the market in winter and spring, and have good market prospects. Plant growth regulators are widely used in strawberry production, which can promote plant growth and development and improve the quality and yield of its berries.
1. It is used to promote the growth of strong plants
（1）Gibberellin is used to induce strawberry flower bud differentiation
How to use: 2 weeks before strawberry flower bud differentiation, spray with 25-50ppm gibberellin solution.
Effect: It can induce and advance the differentiation of strawberry flower buds for 5-10 days.
（2）Gibberellin is used to promote early flowering of strawberries
How to use: Sprinkle 10-20ppm gibberellin solution 2 weeks before flowering and several days before flowering, and spray the leaves as the degree. Promorpholine is more effective and safe.
Effect: make strawberries bloom earlier, elongate fruit stems, make berries grow off the ground, reduce disease and soil pollution to berries, and facilitate harvesting.
（3） Gibberellin is used to promote the growth of strawberry stolons
How to use: After the strawberry berries are harvested, the stems and leaves of the plant grow gradually. From June to June, spray the 1-year-old plants with 50ppm of gibberellin solution, or spray once in June and July.
Effect: Promotes stolon extraction and growth.
（4） Brassin, aspirin, and S-induced antibiotics are used to prevent strawberry freezing damage
How to use: In late autumn and early winter, spray the whole strawberry plant with brassin 0.02ppm, aspirin 100ppm, abscisic acid 1ppm.
Effect: effectively prevent cold and frost, and have no adverse effect on plant growth
Precautions: During the harvesting period, if the strawberry grows too vigorously, it can also be sprayed. It can increase the number of fruits, improve the cold resistance of plants, and increase the low temperature production capacity.
2. It is used to promote production and ensure quality
（1） Control prosperity to improve fruit setting rate. Paclobutrazol is used to promote fruit set in strawberries.
How to use: After the strawberry is transplanted, spray 2-3 times 200-400ppm paclobutrazol solution on the whole plant.
Effect: Promote strawberry fruit setting and increase yield.
Tip: uniconazole, chlormethalin, choline chloride can be used. The recommended concentration is 40-60 ppm for uniconazole, 400-600 ppm for chlorophyll, and 500-1000 ppm for choline chloride.
（2）Gibberellin is used to improve strawberry yield
How to use: When strawberry is cultivated in the open field, spray with 10ppm gibberellin solution from mid-March, spray once every 1 week, spray 3 times in total, or spray 3 times a week in the early flowering stage.
Effect: Increases early and total berry yield. Sprayed at the beginning of flowering, the berries are elongated and of good quality.
（3）Naphthalene acetic acid for improving strawberry yield
How to use: Spray young strawberry fruit with 20-50ppm naphthalene acetic acid solution.
Effect: Promotes berry expansion and increases yield.
Tip: Use with caution when intercropping with other crops.
（4）2,4-D for improving strawberry yield
How to use: Spray young strawberry fruit with 10-50ppm of 2,4-D solution.
Effect: Promotes berry expansion and increases yield.
Tip: Use with caution when intercropping with other crops.
（5）Naphthalene acetic acid is used to reduce deformed fruit of strawberry
How to use: Fill the heart with 50-100mg/L naphthalene acetic acid solution at the early flowering stage and the fruit setting stage of strawberry, and use a syringe without a needle to pour 5ml at the inflorescence and growing point. The combination with boron fertilizer and potassium nitrate has better effect. . And spray 0.3% boric acid solution on the leaves 10 days before flowering.
Effects: The rate of deformed fruit was 25.26% in the control group, and 9.92%-15.25% in those treated with naphthalene acetic acid. Among them, the treatment with 100 mg/L naphthalene acetic acid + 0.3% boric acid solution had the best effect, and the rate of deformed fruit decreased by 60.73% compared with the control.
（6） Diethyl aminoethyl hexanoate is used to increase production and improve quality
How to use: During flowering and fruit setting, spray 15-25ppm of diethyl aminoethyl hexanoate solution. Spray the whole plant.
Effect: Increase yield by 10%, increase sweetness and firmness.
（7） Chlorfenuron is used to expand strawberry fruit
How to use: Use 5-10ppm of chlorfenuron to spray the whole plant in strawberry expansion stage after fruit setting, focusing on fruit.
Effect: increase the single fruit weight, increase the fruit size, and speed up the fruit expansion speed.
Tip: It is better to use in combination with potassium dihydrogen phosphate and calcium chloride.
3. It is used to prolong the fresh-keeping period of fruit
（1） Naphthalene acetic acid is used to prolong the shelf life of strawberries
How to use: Spray the fruit with 10mg/L naphthalene acetic acid + 1% calcium nitrate solution or calcium sugar alcohol, and store it at 20-25°C during the day and 14-18°C at night.
Effect: The calcium content of berries increased on the second day after harvest, the fruit firmness increased by 15% on the fourth day after storage, and the fruit rot index was low.
（2） Cytokinin is used to prolong the shelf life of strawberries
How to use: After strawberries are harvested, spray or dip the berries with a 10ppm kinetin solution.
Effect: Keep strawberry berries fresh, prolong storage period and market supply period.
（3） Methyl jasmonate is used to prolong the shelf life
How to use: Spray 0.5-1ppm methyl dihydrojasmonate before harvesting, focusing on the fruit.
Effect: Improve fruit firmness, prolong fresh-keeping period, and prevent rot.
Matters needing attention: The concentration of plant growth regulators is very important for strawberry growers and friends. It must be applied on a large area after repeated tests according to the variety, temperature and humidity.
