Varietal differences in the yield and polyphenol content of sweet potato (<i>Ipomoea batatas</i> L.) foliage

We determined the foliage yield, polyphenol content, and yield of weekly greenhouse-cultivated major varieties sweet potato with aim to utilize as a source. The two-year study was conducted using five from May November 2012, Kokei No. 14, Koganesengan, Murasakimasari, Tamaakane, Suioh, three October 2014, Beniharuka. Koganesengan Beniharuka in 2014 significantly higher than other varieties. content both years compared others. is variety whose leaves represent portion total foliage; highest its leaves. Therefore, has potential be an efficient source polyphenol. Our provides basic data for stable use polyphenol-rich material.