ANBAR JOURNAL OF AGRICULTURAL SCIENCES

Abstract

An factorial experiment according to randomized complete block design with three replicates was conducted in the field of the collage of Agriculture – University of Baghdad with silty clay loam soil texture at 2015.To study the effect of two speed levels L6 and H1 as first factor with two tire pressure 15 and 30 bar as second factor. The local industrial moldboard plow 112 with three body have been joined to the tractor. The speed of tractor under H1 speed and 15 bar pressure reached 3.00 Km hr-1, and at 30 bar was 6.00 Km hr-1, while the speed for L6 at pressure 15 bar was 1.54 Km. hr-1 and at 30 bar 3.70 km hr-1, soil moisture content was fixed at carrying out the experiment between 18±2%. We studied the effect of two factors on slippage percentage, practical productivity, field efficiency and bulk density and penetration resistance for soil at two depth 0-15 and 15-30 cm.
Results showed significant effect for two factors and there interaction on all studied parameters. When we reduced tires pressure from 30 to 15 bar caused reduction in the percentage of slippage with 52.7 %, also increasing the tractor speed from L6 to H1 caused increasing in the percentage of slippage with 31.1%. Associated with 43.8% increasing in the practical productivity. Also significantly affected on field efficiency, which increased with 16.5%.