Yixing City adopts mulch, small arch sheds, and multi-layer covering methods to cultivate winter and spring pods of tomatoes. The time to market is early, the output is high, and the benefits are good. Generally, the yield per mu is 7,000 kg, and the seedling yield is about 12,000 yuan. Variety selection choose to resist low temperature and low light, the degree of plant development is small, inter-node short early maturing or early-maturing early maturing varieties, such as Zhejiang powder 202, cooperation 928, cooperation 206, Liaoyuan Duoli and so on. Seeding nursery from late September to mid-October sowing, 40 grams per acre seed amount. Before sowing, soak the seeds in warm water of 30°C for 15-30 minutes, remove them and put them in 55-60°C hot water for 15 minutes soaking and stirring. The temperature of the bed after sowing was controlled at 25°C, and 50% of the seeds were removed when the seedlings emerged. When the temperature reached 8°C on sunny days, the film was ventilated and the film was only opened when the temperature reached 12°C. Seedlings 2 leaf 1 heart period, into the diameter of 10 cm in the nutrition bowl. Slow seedlings increase the seedbed temperature and promote hairy roots. After 7 days, when the temperature in the shed exceeds 35°C, cool it in time. Site preparation and planting combined with 5000-8000 kg of organic fertilizer applied per acre. The 6-meter-wide greenhouse is made of 6 feet, the width is 60 centimeters, the width is 40 centimeters, and the width of the outside of the greenhouse is 30 centimeters. Dig 30 cm deep in the middle of each channel, diammonium phosphate per acre 20 kg of urea, 10 kg of urea, 30 kg of potassium sulfate, flattening the back cover film. In mid-December, the seedling age was about 60 days. The seedlings were planted with 7 leaves and 1 heart at the heart stage. Each row was planted with 2 rows and the plant spacing was 30-35 cm. Ten days before planting, the large film was placed on the ground. After planting, pour enough water and take a small shed. In the greenhouse, two curtains and small arches are made of non-woven fabrics weighing 40 grams per square meter to facilitate ventilation, reduce humidity, and reduce disease. The two curtains and small arches were arched with bamboo pieces. Two of the curtains were covered with two 4.4-meter-wide non-woven fabrics. When they were uncovered, they were closed from both sides to the middle. After the temperature management, 3-4 days after colonization, no ventilation was allowed, so that the greenhouse temperature was kept at 25-30°C during the day and kept at 15-17°C during the night to promote the easing of seedlings. After easing the seedlings, the greenhouse temperature is controlled at 20-25°C during the day and 12-15°C at night. As a result, the shelf temperature was kept at 23-27°C during the day and 13-17°C at night. As the temperature rises in the middle and late stages of growth, ventilation should be strengthened to reduce the shed and prevent the occurrence of high temperatures above 35°C. The minimum temperature is above 12 °C when day and night ventilation. When the first fruit of fertilizer and water management is inflated, 10 kg of compound fertilizer is applied to each hole in the open space between the strains. After that, 20 kg of compound fertilizer is applied per acre for a total of 4-5 applications. At the same time, 0.3% of dihydrogen phosphate is sprayed. Potassium solution 2-3 times. When the soil is dry, a small ditch is filled 2-3 times. Pay attention to remove water in a timely manner to prevent excessive humidity in the shed. The plants were adjusted to single stalks and pruned, and they were authorized once every 4-5 days. Each flower inflorescence leaves 3-4 flowers to ensure that the fruit can grow fully. When the plants have 6-8 tassels, leave 2 leaves topping above the uppermost inflorescence. Preserved fruit in early spring, the temperature of tomato in the early growth period is low, humidity is high, and the light is weak. It is easy to cause fruit drop and fruit drop, and it can use 25-50 mg/kg of rhizomatis subtilis or high-yield agent No.2. Diseases and pests prevention and control common diseases and diseases of tomato leaf mould, gray mold, early blight, aphids, whitefly, leaf miner, etc., pay attention to medication control.
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