After entering the winter, as the light time becomes shorter and the nighttime temperature is lower, the humidity in the shed will gradually increase, and some low-temperature and high-humidity diseases will easily occur, adversely affecting the normal growth of tomato, and presenting tomato winter Technical management points:
Temperature management. After entering the winter, greenhouse tomatoes should be managed with heat preservation and temperature increase. Low temperatures will cause tomatoes to fall and fall, and even freeze damage will occur. The fruit setting rate will be greatly reduced, which will seriously affect the production. Therefore, it is important to control the temperature in the sheds scientifically. The daytime temperature is kept at 23°C~28°C and nighttime at 15°C~18°C. The above temperature is the optimum temperature for tomato growth. In the event of heavy snowfall or high winds, the temperature can be increased by using coal stoves, heating, or artificial supplemental lighting.
Light and ventilation. Tomatoes are hi-light crops. When the light is sufficient, the plants grow vigorously and have strong resistance to disease. On the contrary, it will cause the plant to grow in length and grow weakly. It will also create conditions for the infection of diseases. Can be used to hang a reflective screen on the back wall, regular cleaning of the dust or dirt on the film, remove the fog droplets within the film and other methods, do everything possible to increase the light in the shed. Ventilation can achieve the purpose of dehumidification, ventilation and temperature adjustment. Ventilation time should be adjusted according to the weather conditions, but a certain amount of ventilation time must be guaranteed every day, which is conducive to normal plant growth.
Watering and fertilizing. Watering should be done in combination with topdressing. You can't just pour water. Fertilizers cannot use single-element fertilizers. It is best to use ternary compound fertilizers or fertilization. The use of humic acid, active bacterial fertilizers, and calcium fertilizers and other trace fertilizers are the best. The timely and comprehensive supplement of nutritious fertilizer can provide the necessary nutrients for the growth and development of tomato, otherwise it is prone to physiological diseases. When continuous sunny weather is selected, and the amount of watering is small, the time is usually selected in the morning or at noon.
Prevent disease. Winter is a period of high incidence of Botrytis cinerea, late blight, and bacterial diseases. It should be prevention-based, and it should be sprayed once every 5 to 7 days. Pyrimethanil, streptomycin, thiophanate-methyl, or ethidium bromide can be used. Wei + streptomycin + diphenyl ether ring, etc. to do several alternative agents alternating use.
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