Low temperature after sowing in greenhouses
2021-03-10 06:20:38
The 150****7815 mobile phone sent a text message on January 23: I was from Malingshan Town, Xinyi City. Will the use of steel sheds, small arches, mulch film cover, and now can not grow spring radish? If the temperature is too low after sowing, will the seeds be harmed? Radish is cruciferous cold long-day plants. Cold like sex, suitable temperature for growth is 10 ~ 25 °C. Like long-day plants such as rapeseed, it is necessary to complete vernalization at a low temperature for a period of time before it can normally enter the reproductive growth stage, with normal convulsions and flowering. Compared with tomatoes, peppers and other crops, radish has relatively low temperature requirements, and can be planted in a relatively simple and easy-to-use thermal insulation facility in winter and spring. Xinyi and other places can use steel sheds, small sheds, and plastic film coverings to grow spring radishes, and they can be sown and harvested in stages from December of the first year. The optimum temperature for radish seed germination is 20-25°C. Under such temperature conditions, the radish sprouts quickly after sowing, and the emergence is neat. After sowing, the temperature is too low, not only the emergence of radish seedlings slow, and damping-off disease and other diseases are prone to occur, the emergence of seedlings, seedlings decreased, the emergence of irregular seedlings, will bring greater trouble to the future management. In addition, radish is a seed vernalization crop, the external temperature is low during the seed germination, which will lead to early vernalization through the vernalization, and prone to early bolting afterwards, which is not conducive to the growth of the fleshy root, and can not seriously produce commercial production. January-February is the period with the lowest temperature in the year. When the temperature is too low after sowing, it will affect the important limiting factors for greenhouse radish planting. At this time planting greenhouse radish, should pay attention to warming in advance shed, in the ground temperature and shed temperature is higher when sowing. Taking into account the relatively large changes in the weather during this period, to early sowing, can be arranged in the "cold tail warmer", when the ground temperature above 10 °C when sowing, and pay attention to closed shed heating, so that the radish seeds at a suitable temperature of 20 ~ 25 °C Emergence. High temperature and high humidity will cause radish seedlings to grow long. After 80% emergence of radish, ventilation temperature control and humidity control should be used to gradually reduce the temperature to 15 to 20°C, and watering should be strictly controlled. In the period from emergence to "breaking white", the suitable temperature is 15 ~ 20 °C, more than 20 °C should be properly ventilated. The temperature during this period should not be too low, otherwise it will cause radish to pass vernalization too early (when the temperature is lower than 5°C, the radish will pass vernalization in a short period of time). "Blank" to the root expansion of fleshy root, the appropriate temperature is 13 ~ 18 °C, more than 18 °C should be ventilated cooling. This period of radish cold resistance, can withstand low temperatures around 0 °C. The radish fleshy root sown in January had a high ambient temperature during the swelling period, and generally no frost damage occurred. Early sowing, flesh root swelling in the low temperature period, if there is a cold attack, should be based on the cooling situation, increase the appropriate coverage insulation antifreeze, it is best to control the minimum temperature above 5 °C.
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