采种甜菜茬较麦田茬晚25～30天,由于受当地9～10月份温光条件限制,后季作物按排困难。故采种甜菜多按排在旱作区,且田块分散、排灌不便、产量低而不稳。其后季作物多为绿豆等低产值作物,年度(甜菜种加后季作物)经济效益差。从1989年开始,我们在采种甜菜收获后,试栽杂交水稻汕优63。杂交稻亩产由1989年389.5公斤,提高到1992年531.5公斤,年度总 Seeds beet stubble 25 to 30 days later than the crop stubble, due to local 9 ~ October temperature and light conditions, the latter part of the crop row difficult. Therefore, more sugar beet mining row in the dry area, and plots scattered irrigation and drainage inconvenience, low yield and instability. Subsequent crops are mostly mung beans and other low-yield crops, annual (beet and later crop) poor economic efficiency. Since 1989, we planted the hybrid rice Shanyou 63 after harvesting the sugar beet. Hybrid rice mu production increased from 389.5 kg in 1989 to 531.5 kg in 1992, the total annual