The Impact of Forward Tractor Speed and Depth of Ploughing in Some Soil Physical Properties

Abstract An experiment was carried out at the Agricultural Research and Experiments Station in the Sayyada Region of the College of Agriculture - University of Kirkuk, in order to study the effect of forward tractor speed and depth of ploughing in some technical indicators and physical properties of soil in Loam soils in 2019. Two factors were studied, depths of ploughing (4.63 and 6.30 cm) and the practical speed of the tractor (1.72 and 2.86 km hour-1) and their effect on some of the studied technical indicators, including the practical and theoretical field capacity, the slide percentage, the percentage of porosity, the volume of disturbed soil, the soil particles with less than 5 cm in diameter (5 cm m-2) and practical productivity. The experiment was carried out using the factorial experiment method according to The Randomized Complete Block Design (RCBD) with three replicates. The second speed of the tractor and the second ploughing depth exceeded in achieving the highest rate in practical field capacity of (0.28 and 0.34 ha h-1) and theoretical field capacity (0.41 and 0.49 ha h-1), respectively, and in giving the highest volume of the disturbed soil that were (184.48 and 244.753 m3 h-1) and practical productivity (0.33 and 0.39 ha h-1), respectively. While the lowest rate was in the percentage of slide of the first speed and the depth of the first ploughing (7.56 And 6.31%), respectively.The interference between the second tractor speed and the second ploughing depth was superior in achieving the highest rate in the practical and theoretical field capacity of (0.35 and 0.50 ha h-2) and the highest volume of the disturbed soil and practical productivity reached (254.02 m3 h-2 and 0.40 ha. h-2), respectively. The interference between the tractor first speed and the first ploughing depth exceeded the achievement of the lowest rate in the percentage of slide (3.36%).