The field experiment was conducted to study the effects of flue-cured tobacco and sweet potato(Ipomoea batatas ) intercropping, and flue-cured tobacco and sweet clover(Melilotus officinalis) intercropping on tobacco leaves yield and quality. The results showed that intercropping practice does not significantly influence the yield of tobacco leaves in comparison with monocropping. And compared with monocropping and intercropping of flue-cured tobacco and sweet potato, flue-cured tobacco and sweet clover inte...