摘要
低糖产区甜菜含糖率的峰值出现在8月中旬,这以后是马鞍型的动态变化;叶面积指数在3.0以上的时间较正常生长的甜菜少35～20天;总光合势少100(万m^2·d)/ha左右.8月份的平均叶面积指数或光合势可做为判断收获期含糖率的参数;低糖甜菜和正常甜菜干、鲜重冠根比的动态曲线趋于一致。
The peak value of sugar content occured in mid-August in the low sugar region. Afterward the dynamic changes was like saddle. The growing period is loss 35--20 days low sugar beet content beets than noe normal beets when the LAI was 3.0, The total photosynthetic potential reduces aboul 1 (million m2 .d)/ba, The average LAI or photosynthetic potent al of August may be as parameter for determining the sugar content in the harvesting stage. The dynamic curves are uniform at the base of the dry and fresh weight T/R ratio of low sugar content beets and normal beets.
