Abstract
The research included the use of two single & double tine subsoiler plow with Massey Ferguson as mechanical group in two plowed and unplowed soils with silted clay texture by using three forward speeds 0.51, 0.68, and 1 m/sec. The subsoiler plow had been tested by some field performance indicators which included (width and critical depth from the surface, slippage percentage and soil cohesion). The study had been conducted by the use of Randomized Complete Block Design RCBD. The results showed that the use of double tine subsoiler plow causes increase width and critical depth from the surface with 61.59%, 50%, whereas slippage percentage increased with 50%. The minimal degree of soil cohesion recorded 18% in comparison with single subsoiler plow in both soils. The second speed recorded 0.68 m/sec the highest value in width and critical depth, and the increase of forward speed caused the increase in slippage percentage value, and soil cohesion, and the increased percentage was 50% and 11 successively.
