The experiment was carried out at the college of agriculture fields – University of Tikreet during the agricultural fall season of 2009 in Gypsfreous soil. Three tilt angles included 15 and 20 and 25º of disc plow with three tillage speeds included 4.5, 5.5 and 6.5 km/h, To show its effect on some soil physical properties (bulk Density , Porosity and Mean Weight Diameter) and soil vitality properties included ( Penicillium sp., Mucor and Rhizopus sp. Numbers)Complete randomized block design (RCBD) with three replications was used in this experiment and Duncan was used to comparison the mean of treatments.
The results obtained reveals that the angle 25º gaves less bulk density and largest porosity and less Mean Weight Diameter , while the angle 20º gaves less number of Penicillium sp. and Rhizopus sp. . Plowing speed 6.5 km/h gaves less bulk density and largest porosity and largest Mean Weight Diameter .While plowing speed 6.5 km/hr gaves less number of Penicillium sp. and Rhizopus sp. .
The results obtained reveals that the angle 25º with plowing speed 4.5 km/h gaves less bulk density and largest porosity.. while the angle 15º with plowing speed 4.5 km/h gaves less number of Mucor and Rhizopus sp. .