Tomato Seedling Cultivation and Management in Winter and Spring

Seedling cultivation and planting in winter and spring should be carried out in the morning of nibbles, so that the seedbed can absorb more solar energy. If it is not possible to sow in rainy weather, the seeds should be spread out at 10~12℃, covered with a damp cloth, and sowed after the weather turns clear. Before planting tomato seeds, the seedbed should be watered with foot water. Usually, the water depth of the seedbed surface area after concentrated watering is about 5 cm. After the water seeps, the seeds to be sown are evenly spread on the seedbed, and then covered with a sieve to finely cultivate the soil thickness. Use a narrow thin plate (50-60 cm in length) or bamboo pole to flatten the bed surface to make the soil evenly covered. After the broadcast, the bed should be covered and sealed immediately, and the bed temperature should be increased to keep the bed temperature between 25~30℃ throughout the day.

In order to ensure the bed temperature during this period, grass curtains on sunny days are generally used to uncover and cover early. On cloudy and snowy days to see if the seedlings emerge, the curtains may not be exposed or exposed for a short time; in sunny days, the bed temperature can be used without heating during the day and heating at night. Overcast and snowy days can be warmed throughout the day. When planting buds on the top soil, lower the temperature of the bed to keep the night temperature between 12~15℃. During the day, the seedbed should be more visible. Even in the snowy weather, the curtain should be exposed. If there is any emergence of capped seedlings, cover the capping soil 0.3~0.5 cm thick at noon on a sunny day. After the seedlings are completed to the two true leaf stage, it is necessary to prevent the seedlings from growing excessively, but also to promote the healthy growth and development of the seedlings. The usual practice is to ventilate and lower the temperature immediately after the seedlings emerge. During the day, when the bed temperature rises to 22℃, ventilation starts, and in the afternoon, when the bed temperature drops to 22℃, the vents are closed. The principle of ventilation is: back ventilation, from small to large, and it is strictly forbidden to carry out large-scale ventilation when the bed temperature is too high at noon (above 35℃). If the bed temperature is too high due to the lack of ventilation in time, the curtain can be used to reduce the temperature and ventilate.

When the tomato seedlings start to top the center, the bed temperature should be raised appropriately, 20~25℃ in sunny days, 18~20℃ in cloudy days, and 10~14℃ at night to promote the first leaf to stretch. When tomato seedlings grow to two true leaves, increase ventilation and lower the bed temperature so that the bed temperature is maintained at 15~21℃ during the day and 6~10℃ at night. At the same time, foliar fertilizer was sprayed once. The grass curtain should be uncovered early and late to exercise the seedlings. When the tomato seedlings grow to 3 true leaves, they should be divided in time. In order to promote the rapid slowing down of seedlings after splitting, use rooting agent and root water to water. After the seedlings are separated, the surroundings of the seedbed shall be sealed tightly, and the straw curtain shall be uncovered at night and early cover to keep the bed temperature at about 30℃. After the tomato slows down, the new leaves begin to grow. Gradually increase the amount of ventilation. The grass curtains are removed early and evening to keep the bed temperature at 23~25℃ during the day and 10~14℃ at night. 7~10 days before planting tomato seedlings, increase ventilation, reduce seedbed insulation materials, and gradually lower the night temperature so that the lowest temperature can reach 7~8℃ to adapt to the environment after planting.

The above information is provided by seeds manufacturer.