Abstract
Field experiment was conducted to study the performance of three shapes of moldboard plow shares including: Conventional share, Hoe share, and Sectioned share, at two levels of tillage depths included: 10-20cm and 20-30cm and two different speeds included: 3.50km/h and 5.30 km/h .And evaluating their effects on power requirements criteria (drawbar power, soil resistance force to cut and consistency, and energy utilization efficiency). And plowing criteria (soil adhesion on share surface, vertical deviation percentage, and horizontal deviation percentage). The results showed that increasing speed from 3.50-5.30 km/h lead to increased drawbar power, soil resistance force to cut and consistency, vertical deviation percentage, and horizontal deviation percentage but decreased energy utilization efficiency, soil adhesion on share surface. Increasing the depth from (10-20) to (20-30) cm lead to increased drawbar power, soil resistance force to cut and consistency, horizontal deviation percentage but decreased energy utilization efficiency, soil adhesion on share surface, vertical deviation percentage. Sectioned share significantly surpassed on Conventional share and Hoe share in all power requirements criteria and plowing criteria. The depth (10-20) cm with speed (3.50) km/h gave the highest rate of energy utilization efficiency 16.80 m³/MJ, while the depth (20-30) cm with speed (5.30) km/h gave the highest rate for each drawbar power 17.42 kw, soil resistance force to cut and consistency 14.51KN and horizontal deviation percentage 1.65 %. Sectioned share with speed (3.50) km/h succeeded in recording the highest of energy utilization efficiency 18.63 m³/MJ, while Hoe share with speed (5.30) km/h succeeded in recording the highest for each as drawbar power 14.68 kw and horizontal deviation percentage1.65%. Sectioned share with depth (10-20) cm succeeded in recording the highest of energy utilization efficiency 18.46 m³/MJ, while Hoe share with depth (20-30) cm succeeded in recording the highest for each as drawbar power 14.95 kw and soil resistance force to cut and consistency 14.67 KN. Sectioned share with depth (10-20) cm and speed (3.50)km/h succeeded in recording the highest of energy utilization efficiency 19.76 m³/MJ while Hoe share with depth (20-30) cm and speed (5.30) km/h succeeded in recording the highest of soil resistance force to cut and consistency 15.17 KN.
