Effect of Macro Shape Tillage Tool Geometry on Draught Force and Soil Translocation

Abstract

<abstract> <bold>Abstract.</bold> Knowledge of draught and soil disturbance parameters are necessary for accurate design of tillage tools and appropriate matching of tillage implements with power sources. Three shapes of model tillage blade tools namely: rectangular (TWT); V-shape (VBE); triangular (BTR); were fabricated and tested under laboratory soil bin conditions. The tests were conducted at three levels of depth of operation, constant moisture content and rake angle with varied forward speed. For each experimental run, penetration resistance (cone index) was maintained to eliminate the effect of soil compaction on the performance of the tools. The effects of shape on soil disturbance and draught force were evaluated. Rupture distance and maximum width of soil throw were 21, 18, 21 cm and 36.5, 36, 35 cm for TWT, BTR and BE respectively. The ridge to ridge distance was highest (27.5 cm) for TWT and least (26 cm) for BVE. Draught increased with increase in forward speed, with a polynomial relationship of a second-degree order. The highest (and least specific draught were observed with rectangular and V-shape blades as 12.74 and 5.12 N/cm, respectively. Relevant data and information have been provided for optimum design of tillage tools.