In order to improve the performance of stubble-cutting disc on no-tillage planter,it is needed to analyze the effect of shear speed,the cutting edge type and the shear mode on shear properties of stubbles.Using computer controlled electronic universal test machine,shear properties of corn stubbles were experimentally studied for randomized combination of above-mentioned three factors.Results indicate that the shear mode has the largest effect on maximum shear force,next is shear speed,while the cutting edge...