据大量田间试验资料表明，不论在任何情况下，甘薯翻蔓非但不能增产，反而会造成减产，而且随着翻蔓次数的增多，减产幅度也相应加大，据山东农科院作物所对１７６处的调查证明，翻蔓比不翻的平均减产９．９％，又据中国农科院薯类研究所试验。翻蔓两次的比不翻蔓的减产６．５? According to a large number of field trial data show that no matter in any case, sweet potato overturned not only can not increase production, but will result in reduced production, and with the increase in the number of overturn, the corresponding reduction in production also increased, according to the Shandong Academy of Agricultural Crops on the 176 Investigation at the Department proved that the average Manchurian non-inverted 9.9% reduction, but also according to the Chinese Academy of Agricultural Sciences Institute of potato test. Turn the vine twice than do not turn Manor cut 6.5?