Draught Performance of a Range of Model Chisel Furrowers

The effect of draught on the performance of geometrically similar models chisel furrowers was investigated. The experiment was carried out in an artificial soil in an indoor soil bin. The tool design parameters investigated were nose angle (10, 20, 30o), slide angle (5, 10, 15, 20o) and cutting edge height (2, 5, 10 mm). The operating parameters were tool travel speed (0.02, 0.05, 0.10, 0.15 m/s) and tillage depth (2.5, 5, 7.5, 10 cm). The results showed that draught increased with increases in tool travel speed at increasing levels of tillage depth, nose and slide angles, and cutting edge height. There was no optimum value of speed for which minimum draught occurred at these levels of depth, nose and slide angles, and cutting edge height considered. Draught increased with increases in tillage depth at increasing levels of nose and slide angles, and cutting edge height. Although there was no optimum value of depth for which minimum draught occurred, tillage depth of 7.5 cm had more influence on the draught of the model tools. Since there were no optimum values of tool speed and tillage depth for which minimum draught occurred, the choice of a model tool should depend on soil failure pattern at shallow depths, and size and quality of furrow created at deeper depths. A general model equation with R² of 0.752 was obtained for predicting the draught of the model tools.

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