A field experiment was carried-out at Agriculture Experimental Station of King Abdulaziz University
(KAU), Hada Alsham, Saudi Arabia, to evaluate the changes in some physical and fertility properties of soil treated
with humic acid and/or gel polymers in relation to those of untreated soil under two water regimes. Full irrigation
level, (100% of required water) and minimum irrigation level (60% of full level). Under each irrigation level two
soil amendments, humic acid with a rate of 10 kg ha-1 and gel Polymer with a rate of 16 kg ha-1 beside the control
(not amended) were investigated. The experimental site was cultivated by barley for two growing Seasons using
sprinkler system for irrigation. Results indicated that using soil amendments enhanced soil physical and fertility
properties. They decreased soil bulk density and saturated hydraulic conductivity while increased water holding
capacity, soil organic matter and soil nutrients under both irrigation level. The enhancement under minimum
irrigation level was better that that of fully irrigation level. Ha treatment was better than Gp treatment. Therefore,
using humic acid with a rate of 10 kg ha-1 with minimum irrigation is good option to enhance the important physical
and fertility properties of light textured soils under dry land conditions.