Abstract
The effects of deep tillage and annual compaction (1996-1997) of two axle loads resulting from wheeled traffic on soil were evaluated by measuring the changes in soil physical properties (cone index, air porosity, and infiltration rate) and by measuring changes in crop yield in comparison with control plots. Results included the effects of these parameters at four depths (10 to 50 cm) on soil cone index and on soil air porosity. Infiltration rate measurements for all treatments and for control plots are also reported. Data obtained from the experimental plots in 2001 showed that infiltration rate was strongly affected by the compaction. Soil cone index and air porosity were still affected from 10 down to 50 cm by axle load. The crop (wheat) response in terms of yield was found to be affected by the two axle loads. The yield was significantly reduced in 1999 and 2000 as a result of compacting loads. Deep tillage of the compacted plots removed the compaction effect and improved yields in all treatments.