多倍体甜菜新品种中甜──双丰319是由双丰416（母本）和双丰8号（父本）杂交选育而成。该品种块根产量、含糖率较高，抗褐血病性强。在1993～1995年黑龙江省区域试验中地对照品种平均块根产量、含糖率、产糖量分别提高4．3％、0．5°S和8．28％。在1995～1997年黑龙江省生产试验中，块根产量、产糖量比对照提高10．8％和10．3％，食糖率持平。该品种品质优良，与对照品种甜研302比较，含糖率提高0．5°S，α—氨基氮、钾、钠含量分别低19．3％、31．5％和15．9％。 A new variety of polyploid beet sweet ─ ─ Shuangfeng 319 is Shuangfeng 416 (female) and Shuangfeng 8 (male) cross breeding. The variety of root yield, high sugar content, anti-browning strong. In the regional experiment of Heilongjiang Province from 1993 to 1995, the average tuberous root yield, sugar content and sugar yield increased by 4.3%, 0.5 ° S and 8.28% respectively. In 1995 ~ 1997 Heilongjiang Province production test, tuber yield, sugar yield increased by 10.8% and 10.3% compared with the control, the sugar rate was flat. Compared with the sweet corn variety 302, the sugar content increased 0.5 ° S, and the contents of α-amino nitrogen, potassium and sodium were 19.3%, 31.5% and 15.9% lower respectively.