Because greenhouse vegetables are green in the ice and snow, is it safe to eat out-of-season vegetables?

The key to vegetable growth in winter is warmth and light.

The two key factors that determine vegetable planting in winter are light and temperature. From winter to the future, long nights gradually turn into long days and short nights, and the lighting conditions improve day by day. Light is a necessary condition to maintain the growth temperature of greenhouse vegetables.

On the day of slight cold, Beijing was wrapped in a world of ice and snow. The highest outdoor temperature in Yanqing is 0℃, and the lowest indoor temperature is 7℃ in the morning and 23℃ at noon.

"In order not to delay the growth of vegetables today, we were in a state of' preparing for war' after receiving the snowfall forecast yesterday. According to the snow situation, remove the quilt covering the shed in time, even if the snowfall is late at night.