EFFECT OF ADDING TWO VERTICAL FINS ON MOLDBOARD PLOW KNIFE IN PARTITIONING OF SOIL SLIDE AND PULLING FORCE

The objective of this research was to study the influence of adding two vertical fins on each knife of three-moldboard plow with Tractor New Hollnd and 80 and puller MF 650 with three factors. The first factor involve plow without fins and plow with two vertical fins put them on each of its three knifes in parallel of the land side. The first fin was put if 168 mm away of the land side while the second fin was put if 115 mm away of the first fin and in parallel with it. Each fin was 6 mm thickness. The metal of the fin was similar to the knife metal. The second factor was the speed. Three different speeds (5.2, 4.5 and 5.5 km/h) were employed in this study, The third factor was the tillage depth. Three depth levels were used namely 10-15, 15-17 and 17-20 cm. The goal of this study was to investigate the effect of fins in soil partition with three speeds and three tillage depths of plow with fins. The experiments were designed using split-spliy plot with complete randomized designed. The fins were regarded as the main factor while the speeds were secondary factors and depths as the sub-secondary factors. The results did revealed that the three-dimensional plow without fins led to significantly increased the depth from 10 cm to 15 cm and to 20 cm. The draft force was changed from 90 kg to 112 kg to 135 kg as increasing of speed from 3.2 km/h to 4.5 km/h and to 5.5 km/h were led to increase the pulling power from 970.2 N to 1107.4 N and to 1411.2 N When using three-dimensional plow, the significant increase in tillage depth from 10 cm to 15 cm and to 20 cm led to increase in pulling force from 1087.8 N to 2332.4 N and to 3038 N Increasing the speed from 3.2 km/h to 4.5 km/h and to 5.5 km/h led to increase the pulling force from 1675.8 N to 2136.4 N and to 2704.8 N The higher pulling power was achieved by interacting of the depth (20 cm) with speed (5.5 km/h). When using the plow with vertical fins, a significant differences were noted in increasing in the soil mass from 5.8 cm\ m(2) to 6.3 cm\ m(2) and to 7 cm\m(2) with increasing the depth from 10 cm to 15cm to 20 cm. The reason behind was the increasing the solidity of the soil with increasing the depth. On the other hand, a significant decreasing in soil mass from 7.2 to 6.5 and to 5.5 cm/m<^>2 with increasing the speed from 3.2 km/h to 4.5 km/h and to 5.5 km/h due to the existence of fins that partition the soil slides into three parts.