Is watermelon cultivated in greenhouse in winter? Is it healthy?

Ventilation should be scientific to prevent melon seedlings from being burned because of the high temperature in the greenhouse, but the air outlet should be set reasonably to prevent the greenhouse film from being blown off by strong wind, and at the same time, no convection will be formed to keep the air circulation at a constant temperature. In recent years, with the adjustment of agricultural structure and the decline of income of conventional field crops. Many farmers began to adjust their planting structure and began to transform from field crops to cash crops. In this adjustment process, strawberries, vegetables, melons and fruits are planted. After the seedlings are delayed, ventilation can be started to adjust the temperature in the shed, which is generally not higher than 3t-32 degrees during the day and not lower than 15 degrees at night. In the meantime, the shed temperature can be controlled by opening and closing the skylight. When the vines grow to about 3t cm, the small arch shed can be removed.

After the seedlings are delayed, ventilation can be started to adjust the temperature in the shed, which is generally not higher than 3t-32 degrees during the day and not lower than 15 degrees at night. In the meantime, the shed temperature can be controlled by opening and closing the skylight. When the vines grow to about 3t cm, the shed can be removed. Generally, the most suitable pollination time is 9: 00 am 9:00- 10/0. It is sunny, too early, the anther is not cracked, there is no pollen on the flower or the pollen quantity is too small. It is too late. When the temperature in the shed is too high, the pollen activity decreases. The fertilization rate decreased. Generally, the greenhouse temperature should be about 32℃ during the day and not lower than 15℃ at night. The strong seedling stage should be controlled above 25℃ during the day and not lower than 15℃ at night.

Watermelon is a warm crop and is afraid of low temperature. In watermelon production, it is very important to master the temperature. The optimum temperature of the greenhouse is 28-35 degrees, at night 12-20 degrees! When the humidity and temperature are too high, the watermelon in greenhouse should be ventilated in time from planting to fruit setting, and the temperature management should focus on cold protection and heat preservation. 3 ~ 4 days after planting, the greenhouse is kept at 25℃ ~ 35℃ during the day and above 15℃ at night. The design, structure and installation of greenhouse in spring and autumn are relatively simple, from slow growth of plants to blooming of female flowers, when the greenhouse temperature is higher than 25℃. The main application scope is to increase the temperature in the greenhouse in spring and late autumn, mainly to ensure that the temperature in the greenhouse is not too low at night.