was attributed to formation of stable macroaggregates with
macropores in the organic amended soil. Soil organic matter
increases generally soil structural stability irrespective of the origin
of the stresses (Kay and Vanden Bygaart, 2002).Kirchhof et al. (2000)
first measured the sinkage resistance that simulated the mechanical
resistance to manual transplantation of rice crop and found that it
decreased with increasing intensity. However, the effects of SOC
concentration on sinkage resistance are rarely studied in thefield