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Nine Measures to Promote High Yield of Greenhouse Tomatoes
First, isolate the conduction of temperature inside and outside the greenhouse. In the intersection of the film and the ground on the outer side of the front of the greenhouse, a 50-60 cm wide, 1-2 cm thick, foamed plastic sheet with a greenhouse and the like can be laid out from the ground, which can effectively block the conduction of the ground temperature inside and outside the greenhouse. Second, the straw is covered with film insulation. In the evening, after placing the straw curtain, a layer of polyethylene film is covered on the straw curtain. The width is equal to the length of the straw curtain. The length is the same as the length of the greenhouse. The film is compacted with a woven bag filled with sand. This will not only prevent rain, snow or fog from wetting the straw curtains, and will not remove snow after snow, but will also increase the temperature in the greenhouse by 2 to 3°C. Third, in the greenhouse hanging reflective film to add light. Hanging aluminized retroreflective film on the inside of the northern wall of the greenhouse can increase the indoor light intensity regardless of the cloudy day. Increasing the room temperature by 2°C can improve the distribution of light and increase the light and photosynthesis of the lower leaves and fruits of the sorghum tomato. The intensity of the fruit increases the effective accumulated temperature required for turning the fruit. Fourth, the operation is filled with wheat stubble. Slightly dig the soil down along the operation line and raise the soil on both sides to increase the area of ​​light, which is conducive to the growth of roots. The operation line is filled with 10-15 cm thick wheat straw or crushed straw, which is conducive to reducing the humidity inside the greenhouse, increasing soil permeability, increasing the temperature, and increasing the carbon dioxide concentration. 5. Use aerosols and dust to prevent pests and diseases. Diseases that occur in overwintering pods of tomatoes on a rainy day are mostly caused by high humidity and low temperatures. Therefore, the precondition for prevention is to reduce indoor humidity. The use of aerosols and dusts to control pests and diseases is effective, while not increasing the humidity in the greenhouse. 6. Watering and fertilizing measures at low temperatures. In continuous rainy days, do not water as much as possible. Watering should be carried out at noon on sunny days. It is advisable to use small water for irrigation. Fertilizer should not use chemical fertilizers, and it is best to use active biological fungi with water, and spray foliar fertilizer (active amino acid foliar fertilizer, boron fertilizer, calcium fertilizer, and potassium fertilizer), plus 1% glucose solution. To supplement the supply of nutrients under conditions of low temperature and low illumination, to reduce the occurrence of low-temperature physiological diseases. Seven, timely removal of excess leaves. In addition to diseased leaves, old leaves, yellowing leaves, and lateral branches, they should be removed from their bases. When the fruit grows to the green stage, all the leaves below the ripe fruit can be removed according to the tomato growth. Then spray a broad-spectrum fungicide, can promote fruit enlargement, and promote plant ventilation and light, is conducive to fruit coloring. Eight, auxiliary pollination. Method 1: In the treatment of inflorescences 2 days before the inflorescence, under the condition of low humidity in the greenhouse, the vibrational inflorescence assisted pollination. Method two: In the cold season, the pollen can be pollinated 1 to 2 times per day after sunny morning at 9:00 AM. Nine, to promote early listing. Low-temperature cultivation of tomatoes often results in a long color-changing period leading to fruit-colored ocher and poor storage. The use of "Hongguo 88" for 2 to 3 consecutive injections is beneficial to the coloring of fruits, increase the commodity rate, and can be listed 1 week in advance.
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