Tomatoes are people's favorite vegetables and fruits. Tomato thermophilic temperature, suitable temperature during the day is 25 °C -28 °C, night 16 °C -18 °C. Below 15°C, tomato seed germination, pollination and fertilization, and tomato redness are affected: Below 10°C, growth is slow, reproductive development is inhibited, stems and leaves stop growing at 5°C, cold damage at 2°C, and freezing at 0°C. dead. Above 35°C, reproductive development is affected, and physiological death is higher than 40°C. Adequate light and appropriate temperature difference are conducive to the accumulation and ripening of nutrients, promote the healthy development of plants, prevent leggy, enhance the resistance of tomatoes to disease, stress resistance, and increase production. The basic principle of the tomato's requirement for humidity is that in addition to germination, emergence, and seedling-retaining period, the higher temperature and humidity are required, and high humidity is not required in other periods. For water requirements, except for proper control of water before and during the planting period and ripening period, adequate water supply should be ensured in all other periods. The principle of tomato nutrition supply is that the tomato needs a large amount of fertilizer and should ensure sufficient nutrition in each period. However, there is a certain difference in the fertilizer demand during each growth period. The previous period focuses on nitrogen fertilizer, and the latter focuses on potash fertilizer. The demand for phosphate fertilizer carries out the growth period. Always. However, the need for potash fertilizer should be ensured throughout the reproductive period. Under the condition of guaranteeing the normal growth and development of tomato, the low-temperature exercise of tomato can not only improve the ability of the plant to resist heat and cold, but also reduce the cost of heating and insulation. Under normal circumstances, the optimum temperature is required at the turning point and critical period of tomato growth, such as germination, emergence, flower bud differentiation, pollination, fertilization and ripening period, as well as split seedling colonization, to ensure proper temperature to promote normal reproductive physiological processes and Healing resumes as soon as possible after injury; and adequate training is required before seedlings and planting to ensure safety through the difficult period after injury, and in the normal growth stage, the temperature may be appropriately lower. The key to tomato cultivation is to cultivate strong seedlings. The index of strong seedlings is 6-7 leaves. The seedling age is 60-70 days, and the height is 20-23 cm. 60%-70% of the buds are buds. (Liaoning East Asia Agricultural Development Co., Ltd. Huo Jianyong)
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