Ｋ３４６是美国育成的烤烟新品种，山东省烟草公司于１９９１年引进该品种。１９９５～１９９６年山东省烤烟良种区域试验和较大面积的示范试验表明，该品种产质性状好，耐成熟，易烘烤，高抗黑胫病和青枯病，中抗赤星病，综合抗病性好于Ｋ３２６，是一个具有良好推广应用价值的新品种。 K346 is a new variety of flue-cured tobacco bred in the United States. Shandong Tobacco Company introduced the variety in 1991. From 1995 to 1996, the regional experiments and large-area demonstration experiments of flue-cured tobacco varieties in Shandong Province showed that the cultivars had good quality and traits, mature, easy to roast, high resistance to black shank and bacterial wilt, resistance to brown spot disease, The disease is better than K326, which is a new variety with good promotion and application value.