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Soil compaction of agricultural soils is a global well recognized problem (Hamza and Anderson 2005) due to deteriorated soil environment and adverse effects of intensive use of farm machinery on crop yield (Hamza et al. 2011). In China, subsoil compaction is also caused by inappropriate tillage, traffic and field operations on poor time (Zhang et al. 2006). According to our investigation in 2008, the average soil bulk density at 5–10 cm depth is 1.38 t/m 3 , while the average soil bulk density at the plowpan is 1.52 t/m 3 in central China. The soil bulk density is much higher than the proper soil bulk density for maize which is 1.2–1.3 t/m 3 (Li and

Effects of tillage on soil physical properties and root growth of maize in loam and clay in central China