Greenhouse Early Spring Tomato Seedling Technology

First, nursery time. The nursery time of the early spring in greenhouses depends on the degree of greenhouse insulation and the pull period of the previous crop. For early spring tomato cultivation in arched greenhouses, due to its poor thermal insulation performance, the seedling sowing period is generally from late December to early January. In winter-warm greenhouses, sowing and nursery should be arranged before mid-November. Second, select good breeds. It is necessary to select varieties that are disease-resistant, high-yielding, high-quality, and shelf-stable, such as early spring, early kuei, Xifen No. 3, Li Cun, and Suzhou-Hangzhou No. 9. Third, the seedbed preparation. In the greenhouse, the east-west direction is made, the width is 1.3-1.7 meters, and the length is 6-8 meters. The nutrient soil will be filled into the seedbed. The nutrient soil is rich in organic matter, good ventilation, water and fertilizer, and no pathogens. . Its formula is: 3 years without fertilizing Solanaceae crops in fertile garden soil or 6 fields of field soil, high quality circle fertilizer 4 copies. In addition, add 25 kg of decomposed chicken manure, 1 kg of superphosphate, 10 kg of plant ash or 0.5 kg of potassium sulfate per cubic meter of culture soil. All ingredients must be ground and mixed well. Fourth, soaking germination. Put the seeds in hot water at 50-54°C while stirring; Stop stirring when the water is not hot, soak for 6 hours, remove the water from the seeds, wrap with a clean cloth, and germinate at 25-30°C . With a seed germination rate of 90%, about 50 grams per 1/15 hectare (1 acre) of greenhouse is required. Fifth, sowing technology. Select sowing on sunny days in the absence of rain and snow for 3-4 consecutive days. First spread the bed and paving evenly, level and level, and then drench the bottom water. After soaking, the seeds shall be sown. In order to facilitate uniform sowing, the equal amount of fine soil or fine sand shall be mixed in the germinating seeds for spreading, after sowing. The seedbed is covered with 1-2 cm of sifting fine soil, and finally a layer of plastic film is covered on the surface of the seedlings to keep moist and promote seedling growth. Six, seedbed management. 1. temperature. Keep the bed soil temperature at 18-22 °C, air temperature at 25-30 °C, generally 3-4 days to emerge. 2. Moisture. Seedlings before sub-seedling generally do not need watering, such as found cracking surface. Explain that when the sowing is too shallow or watering is insufficient, one layer of fine soil can be immediately covered. 3. Cover soil. Embed the soil 2-3 times after emergence. The first time the seedlings were planted, the second time after the seedlings emerged, the thickness was about 0.5 cm. The cover soil should be carried out when there is no dew on the small noon of sunny days. Hotbeds and Yangshuo seedlings are required to withdraw the film with the cover soil to prevent freezing seedlings and "flash seedlings" phenomenon occurred, immediately after the cover film should be covered with soil. 4. Cultivate strong seedlings. After the seedlings are unearthed, crowded seedlings, sick and weak seedlings, and deformed seedlings shall be promptly removed. And pay attention to the separation of seedlings before a large temperature difference refining seedlings; planting several days before planting, seedlings sprayed 240 times lime lime equal amount of Bordeaux mixture to prevent the occurrence of disease.

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