河北省宣化县地处京、冀、晋、蒙交界地区,年平均气温7.6℃左右,年日照时数2 800~3 000h,大于10℃活动积温2 200~3 000℃,年降雨300~450mm,无霜期120~135d,属中温带亚干旱气候区,昼夜温差大,光照充足,地形多样,水源充足,适宜蔬菜种植。近年来蔬菜发展迅速,种植秋胡萝卜取得了较好的经济效益,平均每667m2产优质胡萝卜5 000kg以上,产值0.5万~ Hebei Province, Xuanhua County is located in Beijing, Hebei, Shanxi and Mongolia junction area, the annual average temperature of about 7.6 ℃, the annual sunshine hours 2 800 ~ 3 000h, more than 10 ℃ active accumulated temperature 2 200 ~ 3 000 ℃, annual rainfall 300 ~ 450mm , Frost-free period 120 ~ 135d, is a temperate sub-arid climate zone, large temperature difference between day and night, adequate light, diverse terrain, adequate water for planting vegetables. In recent years, the rapid development of vegetables, planting autumn carrot has achieved good economic returns, the average yield per 667m2 carrots more than 5,000 kg, the output value of 5 million ~