Management after Strawberry Buckle Shed in Greenhouse

When the outside night temperature drops to about 8 ℃, heat preservation starts, and late October to early November is the appropriate period for cultivation and heat preservation of strawberries in greenhouses (the appropriate period for buckling greenhouses). Premature heat preservation, high indoor temperature, is not conducive to axillary bud differentiation; too late, plant dormancy, resulting in plant dwarf, adverse to normal results. EVA film and multifunctional non-drip film are suitable for greenhouse film. When the temperature of the greenhouse at night is lower than 5 ℃, multi-layer covering and heat preservation shall be implemented. After the greenhouse film is covered, the plastic film is generally covered after the top dressing at the seedling stage (in the first half of November). The micro-dropper or hose is laid on the border surface before the plastic film is covered. The plastic film is preferably 0.03-0.05mm black opaque polyethylene film.

Shed indoor management mainly grasp the following points:

1. temperature and humidity management.

In the initial stage of heat preservation, the temperature is generally controlled at 28 ℃ ~ 30 ℃ during the day; the temperature at night is controlled at 12 ℃ ~ 15 ℃, and the minimum temperature cannot be lower than 8 ℃; the indoor humidity is controlled at 85% ~ 90%. At flowering stage, it is generally controlled at 22 ℃ ~ 25 ℃ during the day, and the maximum temperature cannot exceed 28 ℃. Too high or too low temperature is not conducive to pollination and fertilization. The night temperature should be about 10 ℃, the minimum temperature should not be lower than 8 ℃, the night temperature should exceed 13C, axillary flower buds will degenerate, and the development of female stamens will be blocked. It is advisable to keep the indoor humidity at 50% ~ 60%, therefore, even in the cold winter, it is necessary to use the high temperature at noon during the day to uncover the membrane for ventilation to reduce the humidity in the shed.

2. water management.

After the greenhouse strawberry buckle shed heat preservation, it is the period of flower bud development, and then soon bud, blossom and bear fruit. After the top inflorescence is harvested, the axillary inflorescence is taken out again and blooms and bears fruit. The plant bears heavy burden. If not fertilized in time, it is easy to show premature aging. Top dressing shall be applied once before flowering with high phosphorus and excellent energy of one mu, 3-5kg per mu of land. After flowering and fruit setting, 3 19 balanced fertilizers shall be applied once per mu of Shenyouneng and sugar alcohol calcium, magnesium and zinc shall be sprayed on the leaf surface every 7-10 days.

Generally, water is watered once before heat preservation and before covering with ground film, and then water is properly replenished in combination with top dressing or if water is not spit at the edge of new leaves in the morning. Greenhouse strawberries are especially suitable for drip irrigation. Special attention should be paid to keeping the soil moist during fruit development.

3. spraying gibberellin.

After the culture is promoted to start heat preservation, the first gibberellin treatment is carried out when 2 new leaves are unfolded and 30% of buds are present, so as to promote the elongation of flower stalk and facilitate pollination and fertilization. Each plant with 3~5 ml/kg or 5~8 mg/kg of gibberellin, sprayed on the heart. 7 days later, the inflorescence elongation was treated once more.

4. plant finishing.

In the growth period, 8-10 leaves of each strawberry plant are kept. Generally, in addition to the main bud, 1-2 lateral buds are kept. Excessive lateral buds should be broken off as soon as possible. Pest leaves, old leaves and stolons should be peeled off in time to ensure a concentrated supply of nutrients to the fruit. The young fruit stage shall be properly thinned, and the young fruit above the fourth fruit sequence of each inflorescence shall be removed, mainly disease fruit, small fruit and deformed fruit. Finally, the first inflorescence has 12~15 fruits, the second inflorescence has 8~10 fruits, and each plant has 20~25 fruits.

5. strengthen pest control.

In this period, the temperature and humidity in the shed are high, and powdery mildew, gray mold, anthracnose and so on are easy to occur, so the prevention and control should be strengthened. Sulfur fumigant (180 square meters and 50 grams of sulfur yellow) can be used for fumigation at night, once every 7 days; Or use "one fumigant" fumigant to prevent and control by 4 tablets of 180 square meters; Or use 25% to make 800~1000 times of 100 grams of liquid spray for prevention and control. The main pests are aphids, mites, etc., which can be lured and killed by yellow insect attractant glue board, etc.; Or spray with 10% Avida mites 1500 times liquid and 10% imidacloprid 3000 times liquid; Underground pests are controlled with 48% Lesburn 800 times liquid.

6. release bees for pollination.

Entering the flowering period in late November, a box of bees is released from each standard shed (30 m × 6 m) to improve the pollination rate of strawberry flowers and reduce the production of deformed fruits. The common method of artificial pollination is to gently apply a soft brush to the center of the open flower or, in full bloom, to gently brush the inflorescence with a fine hair duster.