Fig. 3. Sorghum plant height as affected by tillage treatments in 2003 (a) and 2004 (b) at Abergelle in northern Ethiopia. Y-bars equal LSD0.05. Flat plant = planting with a flat soil surface. TR = tied-ridging; WAP = weeks after planting; IF and OR = in-furrow and on-ridge planting, respectively. Shilshalo = a traditional ridging practice conducted 4 wk after planting.