Daily median growth rates and apical diameters of lateral roots in pearl millet and maize. A and B, Daily median growth rates and associated mean absolute deviations (m.a.d.) were computed for pearl millet (A) and maize (B) lateral root types A, B, and C. C, Daily median apical diameters and associated mean absolute deviations were computed for maize lateral root types A, B, and C.