我国北方地区的甜菜种子繁殖过去多采用春播。春播母根虽具有生育期長,个体長得大的特点。但却有許多的缺点,主要是:費工大、保苗少、佔地多、繁殖低、成本高。为了克服和解决春播母根这种缺陷,我們从一九五六年起,在重点生产队的母根培育地上推行晚播,一九五八年以来,在生产和試驗研究中又进行了母根的复种,即利用当年的大麦和春小麦茬播种母根。結果証明,复种 In the past, the beet seeds in northern China were mostly sowed in spring. Spring sowing mother has a long growth period, individual characteristics of large. But there are many shortcomings, mainly: large labor costs, seedlings less, covering more, low reproduction, high cost. In order to overcome and resolve the shortcomings of the Spring Sowing Mother Roots, we started late evening sowing of the root farms of the key production teams from 1956 onwards. Since 1958, we conducted a mother-child sowing ceremony in production and pilot studies Multiple cropping of roots, that is, using the current barley and spring wheat stubble seeding mother roots. The result proved that multiple cropping