The sinkage resistance is analogue to penetration resistance.
Therefore, both are governed by soil compressibility, soil shear
strength and soil/metal friction, and depends on soil water content,
soil bulk density, soil texture (soil minerals), soil depth and the
instrument used (Gill and Vanden Berg, 1968; Whiteley and Dexter,
1981; Dexter et al., 2007). Soil moisture condition can affect the
measurement of penetration resistance, but not the measurement of
sinkage resistance under water saturated condition. However, it was
not possible to record soil moisture profile while measuring
penetration resistance profile in the field. As there were enough
replicated measurements (n= 15) in each plot, the effects of thefield
treatments were identified (Fig. 4a,b). The positive correlations
between penetration and sinkage resistances varied with thefield
treatments (Fig. 3c), suggesting that the puddlability might