大雪是农历的第21个节气,在每年的12月7日左右,太阳位于黄经255度。北方地区会受冷空气影响,常出现较大的降雪,引起地面积雪。这时我国大部分地区的最低温度都降到了0℃或以下,往往在强冷空气前沿冷暖空气交锋的地区,会降大雪。虽进入冰天雪地的冬季,但温室中却春意盎然,此时的蔬菜生产主要集中在日光温室和育苗棚中,越冬茬管理 Heavy snow is the 21st solar term of the lunar calendar. At about December 7 of each year, the sun is located at 255 degrees. Northern region will be affected by the cold air, often larger snowfall, causing snow on the ground. At this moment, the minimum temperature in most parts of China drops to 0 ° C or below, and the snow tends to drop in areas where the cool and warm air is confronting the front of strong cold air. Although entering the winter ice and snow, but the spring is full of vigor and vitality, this time the vegetable production is mainly concentrated in greenhouse and nursery shed, the winter stubble management