Genotypic variation and environmental effects on yield, quality and agronomic traits of sweet potato Morphological responses of potato varieties (lines) to enhanced UV-B radiation Effect of potato continuous cropping on genetic diversity of soil microorganisms Identification and autotoxicity of root exudates of continuous cropping potato at different growth stages Effects of continuous potato cropping on the diversity of soil microorganisms Effect of Ceratocystis fimbriata infection on antioxidant enzyme activity of sweet potato root