Foxtail millet is a well-known drought tolerant crop in arid and semi-arid regions, because root system plays an essential role in crop growth period. Taking 196 lines from foxtail millet RIL, derived from a cross of cultivar Yugu 1 × wild green foxtail W53 as materials, we investigated root system variance and distribution in the soil with the root canal soil column culture. The results showed that the average length of root per plant, the average root surface area per plant, the average root volume per pl...