江苏大丰县地处苏北黄海之滨,位于北纬33°12′,年平均气温14.1℃,最冷的一月平均气温0.9℃,绝对低温—13℃左右,12年来年平均总降水量1000—1200毫米。按此气象资料,我县属北方落叶果树分布区,过去认为南方的常绿果树在我县是不能露地栽培的,特别是柑桔性喜温暖潮湿气候,原有“北限”不过江的说法。但通过全县果树 Dafeng County, Jiangsu Province is located in the coast of the Yellow Sea in northern Jiangsu, located at latitude 33 ° 12 ’north latitude, the annual average temperature of 14.1 ℃, the coldest January average temperature of 0.9 ℃, absolute low temperature of about -13 ℃, 12 years, the average annual rainfall of 1000- 1200 mm. According to this meteorological data, the county belongs to the northern deciduous fruit tree distribution area. In the past, the evergreen fruit tree in the south was not planted in the open field in our county. In particular, citrus likes warm and humid climate. But through the county fruit trees