Calibration of Discrete Element Parameters of Maize Root and Its Mixture with Soil

Discrete element simulation is an effective method to reveal the interaction between tillage components and work objects. However, due lack of discrete modelling parameters maize root its mixture with soil, existing models cannot accurately simulate farmland environment under a no-tillage system. This study developed single (SMR) different diameters root-soil (MRSM) DEM based on calibrated through angle repose (AOR) tests. First, Plackett–Burman steepest climb tests were performed identify range essential for AOR SMR. Then, optimal SMR MRSR obtained by Box–Behnken design (BBD) testing. The results showed that static friction coefficient SMR-SMR rolling SMR-steel significantly affected AOR. In addition, MRSM was extremely sensitive restitution surface energy soil. Based parameters, relative errors simulated measured pixel peak values piles’ contour curve less than 5% MRSM. error dynamic MSRM 10%. These indicate parameter calibration can be valuable references stubble tillage.