甜菜是我国北方制糖工业的重要原料，而甜菜种子又是甜菜这一原料的原料。为了缩短繁种年限，降低制种成本，我国甜菜糖业生产所需要的种子大多放在南方地区（北纬35°左右）繁殖，直接露地越冬来种，即甜菜种子的“南繁”。南繁种子主要分布在苏北、皖北、山东等地一带；近年 Beet is an important raw material for sugar industry in northern China, while beet seeds are the raw material for beet. In order to shorten the breeding years and reduce the cost of seed production, most of the seeds needed for the production of sugar beet sugar in our country are mostly propagated in the southern area (about 35 ° N) and are directly exposed to wintering, ie, the “South Fan” of beet seeds. Nanfan seeds are mainly distributed in northern Jiangsu, northern Anhui, Shandong and other areas; in recent years