Six agricultural soils (Table 1) were selected to represent
a diversity of soil physical properties. The soils were
collected (0 - 20 cm), air-dried and ground to pass a 2
mm sieve, prior to characterization. Standard physical
and chemical analyses were conducted. Particle size distribution was performed using the hydrometer method . pH was determined in a soil to water extract of
1:2.5. Organic matter content of the soils was
assessed by Walkley and Black wet oxidation method
[15], except for Chagaramus which was done by the loss
on ignition method due to the high content of organic
matter. bulk density was determined using the core method and particle density via the pyconometer method . Atterberg limits were assessed according to.