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 50-60cm wide, 1-2cm thick, and long foam plastic sheet 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 grass curtains, and will not remove snow after snow, but will also increase the temperature in the greenhouse by 2°C to 3°C.
Third, in the greenhouse hanging reflective film to add light. Hanging aluminized reflective film on the inside of the northern wall of the greenhouse can increase the indoor light intensity regardless of the sunny day on cloudy days, increase the indoor temperature by about 2°C, improve the distribution of light, and increase the light and photosynthetic of the lower leaves and fruits of sorghum tomatoes. The intensity of the effect increases the effective accumulated temperature required for fruit color transformation.
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 to 15 cm thick wheat straw or crushed straw, which is conducive to reducing the humidity inside the greenhouse, increasing the permeability of the soil, increasing the temperature, and increasing the concentration of carbon dioxide.
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, so the precondition for prevention is not to increase 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. Fertilization should not use chemical fertilizers. It is best to use active bio-fertilizers with water, combined with foliar spray (live 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. Remove diseased leaves, old leaves, yellowing leaves and side branches in time, remove them from the base when they are removed, and avoid leaving a small amount of snow. 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, so as not only to prevent the old leaves consume nutrients, promote fruit enlargement, but also can promote plant ventilation and light, and help fruit coloring.
Eight, auxiliary pollination. Tomatoes are self-pollination crops. Fruit setting is greatly affected by environmental conditions and supplementary pollination measures can be taken. 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 of commodity rate, and can be listed 1 week in advance.
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