After the beginning of winter, the temperature dropped sharply and the temperature difference between day and night was large. Greenhouses and arched sheds have different thermal insulation properties, different vegetable types and growth stages, and different low-temperature resistance capabilities. Therefore, vegetable farmers should adjust the temperature of the shed as much as possible within the temperature range suitable for vegetable growth. Criteria: keep the food in good shape Among many environmental factors, temperature has the greatest impact on vegetables. The best standard for adjusting the temperature of the greenhouse is that the vegetables are growing well. The suitable growth temperature required for different vegetable varieties and growth stages is different, and the heat preservation performance of the shed is different, and the heat preservation measures should also be different. After the beginning of winter, when the temperature drops greatly, the night temperature will be very low, and heat preservation should be actively carried out to avoid some symptoms of unsuitability for vegetables. Melon vegetables like high temperature. Taking cucumber as an example, its optimum temperature for growth is 10 degrees Celsius-32 degrees Celsius, generally 25 degrees Celsius-32 degrees Celsius during the day, and 15 degrees Celsius -18 degrees Celsius at night to grow****** The temperature required for solanaceous vegetables is slightly lower. Taking tomatoes as an example, the optimum temperature for growth is 13°C-28°C, generally 20°C-30°C during the day and 15°C-20°C at night. Reasonable temperature regulation can adjust the growth of plants. For newly planted or in the early growth period, or in the state of exaggerated vegetables, at this stage, the growth of plants can be adjusted by appropriately reducing the night temperature. Greenhouse: flexible insulation The thermal insulation performance of the greenhouse is different, and the thermal insulation measures should be different. In recent years, greenhouse construction standards have become higher and higher, and thermal insulation performance has become better and better. Old sheds have relatively poor thermal insulation. Therefore, temperature control measures should also be different. During continuous fine weather, between 10 am and 14 am, the temperature in the shed rises quickly and the temperature is higher. In this case, the large shed with good heat preservation performance can open the front face to cool down at intervals, but pay attention to setting up insect nets. In the evening, the tuyere should be delayed or even not closed. In vegetable production, the lowest temperature at night is based on the morning temperature. In the current season, the night temperature of vegetables in the result period is maintained at 15 degrees Celsius, so in the evening, when the shed temperature drops to 15 degrees Celsius to 17 degrees Celsius, the air outlet can be closed. After the tuyere is closed, the temperature of the shed is increased first and then lowered. Only by closing the tuyere at night can the proper night temperature be ensured. The closing time of the tuyere should be flexible, and it cannot be closed at the end of the evening or blindly follow the trend. There is no specific time for closing the tuyere. When the temperature is high, you can come back after dinner to close the vent; when the temperature is low, close the vent before returning home in the evening. Arch shed: the time for insulation The arch shed has poor thermal insulation, especially at night when the temperature is low, and the vegetables are in the fruitful period. Therefore, heat preservation measures should be actively taken to extend the harvest time as much as possible to increase the overall economic income of the shed. Vegetables are burdened during fruitful season and are susceptible to abnormalities due to adverse factors. Therefore, early measures should be taken to ensure a suitable night temperature. Vegetables: Improve plant resistance Adjusting the temperature of the shed is conducive to the healthy growth of vegetables, and cultivating strong trees is the key to improving the ability of plants to resist adversity. For fruit-bearing vegetables, the cultivation of strong trees can be carried out from the following aspects: supplement nutrition. While replenishing the large number of elements, the medium and trace elements should be added on time. When supplementing nutrition, it is necessary to ensure that the nutritional ratio is reasonable, but also to ensure that it is fully absorbed; reduce nutrient consumption. For vegetables with more side branches, such as hot peppers, the weak side branches should be removed in time to reduce nutrient consumption; strengthen root and leaf protection. During flushing or spraying, products containing alginic acid, amino acids, and chitin can be added, which can play the role of root and leaf protection. Pay attention to weather forecasts, especially short-term weather forecasts. When the low temperature suddenly strikes, you can spray functional products in advance, such as alginic acid, chitin, antifreeze, etc., which can improve the cold tolerance of vegetables. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Different kind of Transport Swab,viral transport swab, bacterial swab. Transport Swab,Sample Collection Swab,Viral Transport Swab Luck Medical Consumables Co.,LIMITED , https://www.luckmedical.com