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In order to select flue—cured tobacco varieties appropriate for planting in long Yang of Baoshan.and to Explore the corresponding cultivation measures to resolve the problem of tobacco growing single species and the contradiction of the main variety degradation,, field comparison test of eight varieties were conducted. The growth periods, botanic characteristics, yields, leaf qualities, and tastes of eight variety YunYan 100, YunYan105, NCl02, KRK26, KRK28, KRK23, NC297andYunYan99 were studied at Longyang, Baosha.The results showed that,(1)In the plant height, leaf number, stems and pitch, KRK28 is the greatest;YunYan105 has the highest yield, followed YunYan100 and YunYan99. YunYan100 has the highest output value and the producing, followed YunYan105 and KRK26, The light of the main diseases is yunayn100 and YunYan105,A comprehensive analysis on the agronomic traits, economic traits. inherent quality and disease resistance of different tobacco varieties, presented the best performing cultivars YunYan100, YunYan105, KRK26, YunYan99.(2) KRK26, KRK28, KRK23 which have more much effective leaf should increase properly transplanting strains of the lower leaves pages, increase the intensity of light and leaves heavy.(3)YunYan99 at-risk TMV, KRK23 tobacco black shank onset more serious, NC102 climate sex disease onset is heavy. According to the resistance of the variety demonstration, we should suit the remedy to the case well pest control, avoid the susceptibility to disease occurrence variety demonstration;(4)YunYan105, KRK23, NC102 not resistant to raise, resistance of short, should be cooked harvested. We should also strengthen demonstration to each varieties production technology and guidance of baking training measures.According to comprehensive performance of varieties at the local to choice appropriate e good varieties, this study, provide scientific basis and the reference for the update and rational layout.
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