黑龙江、吉林两省属我国北方严寒地区年平均气温在-6℃-7℃,冬季漫长寒冷,夏季短促,全年无霜期在90～150天。历史以来粮食及瓜类露地生产都是实行一年一熟耕作制度。我们分析了两省的气候条件认为,两省生产西瓜、甜瓜的大部分地区,其热量利用率仅为60～78％,西瓜、甜瓜“园”到温度降至作物低温生育极限,还有一个多月的生长季节白白浪费掉。如 The two provinces in Heilongjiang and Jilin Provinces are in the cold region of northern China at an average annual temperature of -6 ℃ -7 ℃. The winter is long and cold and the summer is short. The annual frost-free period is between 90 and 150 days. Since the history of grain and melon open-field production is the implementation of a one-year farming system. We analyzed the climatic conditions in the two provinces that the majority of the provinces producing watermelon and melon use only 60-78% of their calories, and the watermelon and melon “garden” Many months of the growing season wasted. Such as