Tomatoes use multiple fruit-setting techniques, one sowing, harvesting 2 or 3 times, yield can be increased more than 2 times. Specific techniques are as follows: Suitable for sowing 1. Preparation before sowing. Take 6 pieces of uncultivated vegetables, add 4 pieces of pig manure after sieving, add 50% carbendazim 40 g, 0.5 kg of monopotassium phosphate, 0.2 kg of urea per cubic meter of mix. . The nursery bed is laid after the nutritious soil is prepared. The nursery bed is 330 centimeters long. After it is laid, it is stepped on foot. After the water is poured, the film is heated. The nursery bed used for seedlings is the same as that for nursery beds, and the film is heated after watering. 2. Variety selection. Since the growth period of tomato in winter and spring in solar greenhouse is in the season of low temperature and low light, it should be planted in early-maturing varieties with easy fruit setting, fast fruit development, and good commercial character such as Jiafen 15 at low temperature. 3. Sowing time. According to many years of production experience, the sowing date is suitable from late September to early October, planting in late November, and harvesting in mid-February in the following year. 4. Seed treatment. Before sowing, select the sunny days to sow the seeds for 2 days, then soak them in water of 50°C-55°C for 15-20 minutes. When the water temperature drops to 30°C, remove the mucus from the seeds and wash them with water, and then Soak in warm water of 25°C～30°C for 5-6 hours. After soaking, place it in the environment of 25°C～28°C and germinate. After 2～3 days, it can sprout. In addition, the seeds can also be treated at a low temperature, that is, the seeds that are to be germinated after soaking are placed in a temperature of about 0° C. for 1 to 2 days, and then slowly warmed, which can promote seed germination and enhance the cold resistance of the seedlings. 5. Seeding method. Seeds can be sown immediately after sowing. Before sowing, the surface of the seedbed is wetted with a watering can, then sprinkled with a thin layer of moist fine soil. Seeds of 5 to 10 grams per square meter are sown and covered with 1 cm of fine soil after sowing. Soil temperature before emergence is kept at 23°C～25°C, and the seedlings can emerge in 4 to 5 days. Cultivating strong seedlings Since the nursery period of the greenhouse in winter and spring is in the late autumn and early winter seasons in the solar greenhouse, it is critical to manage seedlings to cultivate young seedlings of the right age. 1. Management after emergence to sub-seedling. When 50% of the seedlings are unearthed, the daytime temperature of the seedbed is controlled at 22°C to 25°C and the nighttime temperature is controlled at 10°C to 12°C. After the cotyledon of the seedlings is unfolded, the seedlings must be sown early and the sick and weak seedlings must be removed. Sub-seedlings generally do not water, to prevent excessive humidity caused by disease, soil relative humidity to 60% to 70% is appropriate. The first true leaves of the seedlings are covered with a small arch shed, and the seedbed temperature is appropriately raised. The daytime temperature is controlled at 24°C to 26°C and the nighttime temperature is controlled at 12°C to 15°C. When the seedlings grow to 2 leaves and 1 heart, they can be divided into seedlings. Attention should be paid to the seedlings not too late. 2. Management after sub-seedling and before planting. Split seedlings can prevent seedlings from becoming crowded and can promote multiple seedling roots. Sub-seedlings should be carried out on a sunny morning. The seedlings can be planted on pre-prepared seedling beds. The spacing between seedlings should be 15 cm. After planting, the seedbeds should be filled with sufficient water and covered with a thin layer of nutrient soil. In order to promote easing of seedlings, seedbed temperature after seedlings should be properly increased. The daytime temperature should be controlled between 25°C and 28°C, nighttime temperature should be controlled between 10°C and 18°C, and the ground temperature should be controlled between 18°C ​​and 22°C. About one week after seedling, the seedlings begin to take root, and the growth point begins to grow. At this time, seedling temperature can be properly reduced to prevent seedlings from being long. The daytime temperature is controlled at 25°C to 27°C, and the nighttime temperature is controlled at about 10°C. At 18 °C ~ 20 °C to promote flower bud differentiation. 3. When the seedling reaches 55 to 56 days, it can be planted. In order to enhance the resistance of the seedlings and cold resistance, improve the survival rate of the colonization and shorten the period of seedlings, seedlings should be low-temperature hardening before colonization. The seedlings that have undergone low-temperature training can tolerate low temperatures around 0°C for a short period of time without freezing injury. The hardening seedlings are usually carried out 7 to 10 days before planting. During the day, the temperature is controlled between 20°C and 22°C. The temperature is controlled between 8°C and 10°C in the middle of the night and the temperature is gradually reduced to 6°C to 8°C in the latter half of the night. Reasonable dense planting 1. Fertilization for soil preparation. The land will be well-prepared one week before colonization. During the site preparation, 12 to 15 cubic meters of chicken manure was used for composting, 50 kg of diammonium phosphate, 30 kg of urea, and 20 kg of potassium sulfate. After fertilization, the land was turned (more than 40 cm deep), and then leveled. 70 cm row spacing, 50 cm row spacing, ridge height 15 cm. 2. Planting time. The time for planting tomatoes in winter and spring is generally in late November, and the temperature of the top soil (10 cm thick) in the greenhouse should be above 13°C during colonization. 3. Colonization density and colonization methods. Generally, about 3,000 plants are planted per acre of greenhouses, and the plant spacing is 26-27 cm. Planting work should be carried out in the sunny morning. When planting, planting and planting holes should be dug by the size of the soil, and put into the soil. The sorghum surface should be 1 cm lower than the ridge surface, and then the water should be planted and planted. After 5 to 7 days, the mulch is covered. Post-planting management 1. Temperature and light management. To promote the easing of seedlings, the greenhouse insulation work should be done well before planting till the seedlings are warmed. The daytime temperature should be controlled at 28°C to 30°C (exceeding the wind at 30°C) and the nighttime temperature should be controlled at 15°C to 18°C. The daytime temperature is controlled at 27°C to 28°C (relative to 28°C), the temperature is controlled between 15°C and 18°C ​​in the middle of the night and the temperature is between 10°C and 12°C in the latter half of the night. A reflective curtain can be placed on the back wall of the greenhouse to improve lighting conditions in the room. After entering the result period, the indoor daytime temperature is controlled at 25°C to 28°C, the temperature in the first half of the night is controlled at 14°C to 18°C, and the temperature in the latter half of the night is controlled at 10°C to 13°C. As the weather warms up, the amount of ventilation should be increased, and the room temperature should exceed 30°C in a timely manner. Ventilate day and night when the outside temperature is as low as 15°C. After the tomato fruit is swollen, the optimum temperature for the coloring period is 24°C, the daytime temperature is controlled at 24°C~26°C, the nighttime temperature is controlled at 15°C~17°C, and the ground temperature is controlled at 15°C or above, so that the tomato not only enlarges quickly but also colors The speed is also fast. 2. Fertilizer management. After pouring water after planting, the first fruit is generally no longer top-dressing and watering in order to promote root development and control leggy plants. If the soil is too dry, you can pour small water on a sunny morning. When the first panicle grows to the size of the walnut, fertilizer and watering are started. After each mu of greenhouse, 20 kg of urea, 20 kg of diammonium phosphate and 10 kg of potassium sulfate are applied. Topdressing and watering should be carried out on a sunny morning. After watering, the greenhouse should be closed and heated. After the temperature is raised, the amount of air to be blown should be increased. When the second ear is enlarged, it will be top-dressed again, and the amount of top-dressing will be the same as the first time. After the fruit enters the expansion period, it is poured once every 7 to 10 days, and the amount of water should be uniform. Otherwise, it is prone to develop umbilical rot, early blight, and late blight. 3. Pruning. Two and a half months after the planting of the tomato, if the plant grows to a certain height, it cannot grow upright. It should be suspended with a rope. Single pruning was performed during cultivation, and the tomato did not fight before flowering, and all lateral branches were removed after flowering. The snoring should not be premature, and it is advisable to remove the scorpion as long as 3 cm in length. 4. Apply hormones to protect the fruit. To cultivate tomato in winter and spring, hormone must be applied to protect the fruit. Currently used hormones are 2,4-D and tomato spirits. The suitable concentration of 2,4-D is 10 ppm to 20 ppm. When the temperature is high, the concentration should be low. When the temperature is low, the concentration should be high. When the application, according to the instructions of 2,4-D, the concentration of the drug solution is firstly added, and then the red advertisement color is added to make the mark, so as to avoid the abnormal fruit caused by repeated flowering. The flowers that are open on that day are suitable for the flowers, and the flower stalks should be painted with a brush and a little liquid. It is necessary to wipe the flowers one by one so as to prevent the medicine droplets from growing on the young leaves and growing points of the plants. The suitable concentration of Tomato Spirit is 25ppm to 50ppm. After the preparation is completed, the flower buds with 3 to 4 flowers will be immersed in the liquid, and then the liquid from the inflorescence will be caught in a small bowl. In order to prevent botrytis, 0.2% siklorin or proplonitrile can be added when preparing the above-mentioned drug solution. 5. Suitable harvesting. Reddening at the top marks the fruit entering the color change phase. When 1/2 or 2/3 of the tomatoes turn color, they can be picked and marketed. The abstract was collected on the night of the first day and was sealed and stored in an environment of 22°C to 24°C after picking. The tomatoes were basically reddish when they were listed the next day. The first fruit of the tomato should be picked as early as possible, otherwise it may cause premature plant failure. 6. Change heads. Before the third ear of tomato was harvested, the lower old leaves and diseased leaves were destroyed, and two robust lateral branches were selected for cultivation. The position of the selected lateral branch is determined according to the specific situation. Generally, the upper branch results are left as early as possible, and the lower branch branches are robust, depending on the growth conditions of the two side branches. After the third ear was harvested, the trunk was cut off, the lateral branches were cultivated, and fruit was continued on the side branches. Collaterals left 3 to 4 ear fruit topping, pruning method with the former. This can be changed twice.
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