昌黎地区甜菜种植在麦茬后,6月末至7月初播种时正值雨季,立枯病严重,影响保苗,致使减产.为此,自1987年起进行夏播甜菜采用苗圃育苗大田移栽.通过3年育苗移栽试验,提高了保苗率,但褐斑病较为严重,致使产量、含糖下降,为此,我们又进一步探索育苗期与甜菜产量、含糖率以及与褐斑病发病关系试验。试验方法:试验用多倍体品种苏垦8312.播前甲基硫环磷和保苗灵(内蒙糖所生产)闷种一夜.苗圃为平畦,整平后条播,株行距6cm×12cm.移栽与直播田行株距均为50cm×27cm,移栽田移栽后灌一次大水,其它管理均相同.试验以大田直播与苗圃分期育苗同期移栽进行对比.1990年苗圃播种期为5月5 Sugar beet is planted in the Changli region after the stubble, from late June to early July planting seasons when the rainy season, severe damping-off, affecting seedlings, resulting in reduced production.To this end, since summer planting beet nursery nursery field transplanting.Through 3 The seedling transplanting test in the year raised the seedling-raising rate, but the brown spot was more serious, resulting in the decrease of the yield and the sugar content. Therefore, we further explored the relationship between the seedling emergence and sugar beet yield, sugar content and the incidence of brown spot. Test Methods: Test polyploid varieties Su Ken 8312. Sulfur methyl phosphorus before sowing and Paul Miao Ling (Inner Mongolia sugar production) boring kind of overnight nursery for flatfish, flattened after sowing, line spacing 6cm × 12cm. Planting and direct broadcasting field row spacing are 50cm × 27cm, transplanting transplanting a big flood, the other management are the same .Taking the live broadcast and field nursery nursery seedling transplanting at the same period compared to 1990 nursery sowing period of May 5