【目的】研究宿根甘蔗黄化幼苗根系活力及其营养特性,探明宿根甘蔗幼苗黄化与根系吸收矿质元素能力的关系。【方法】在宿根蔗幼苗黄化发生严重的蔗区采集宿根黄化苗、相邻地块宿根正常苗和新植蔗苗的根系样品,测定根系活力及根系N、P、K、Fe、Mn、Cu、Zn、Mg、B、S等营养元素含量。【结果】黄化苗根系活力极显著低于宿根正常苗根系和新植蔗苗根系;黄化苗根系N含量略高于宿根正常苗根系,但低于新植蔗苗根系;黄化苗根系P、K、Fe、Mn、Cu、Zn、Mg、B、S等元素含量均极显著低于宿根正常苗根系和新植蔗苗根系,新植蔗苗根系矿质元素含量最高。【结论】宿根蔗黄化苗根系活力微弱,矿质元素含量不足,营养贫乏,不能从土壤吸收矿质元素。 【Objective】 Root activity and nutritional characteristics of rooted sugarcane yellowing seedlings were studied, and the relationship between yellowing of rooted sugarcane seedlings and the ability of mineral elements in roots to be absorbed was investigated. 【Method】 Root exudates, the normal shoots of the adjacent plots and the roots of newly planted sugarcane seedlings were collected from serious sugarcane area where root exudation of sugarcane seedlings occurred. The root activities and root N, P, K, Fe and Mn , Cu, Zn, Mg, B, S and other nutrients content. 【Result】 The results showed that the root vigor of the yellowing seedlings was significantly lower than that of the normal and new sugarcane seedlings. The content of N in the roots of the yellowing seedlings was slightly higher than that of the normal seedling roots, but lower than that of the newly planted sugarcane roots. The content of P, K, Fe, Mn, Cu, Zn, Mg, B, S and other elements were significantly lower than those of the normal root and new sugarcane seedlings. The contents of mineral elements in the root of newly planted sugarcane were the highest. 【Conclusion】 The root activity of sugarcane rooted in sugarcane was weak, the content of mineral elements was not enough and nutrition was poor, and mineral elements could not be absorbed from the soil.