optimization of chisel tine operation used in combined tillage machine

performance optimization of chisel tine was proposed by using a chisel plow with adjustable rake angle. effective treatments consisted of soil moisture at 0.5, 0.7 and 0.9 of plastic limit (pl), three rake angle of 30, 40 and 50 degree and speeds of to 3, 5 and 7 km h-1. the measured parameters included draft, soil disturbance area, soil upheaving area, clod mean weight diameter (mwd), specific draft and soil cone index (ci). the statistical design used in this study was split block factorial. to performance optimization of chisel plow in terms of six measured factors, three regression equations based on multiple regression for three factors: soil moisture, tine rake angle and travel speed for six measured qualities obtained. regression analysis showed that the best moisture for tillage is 0.71 (pl), the best rake angle is 34 degree and the best speed is 5.5 km h-1.