Dynamical Simulation Of The Soil-cassava Root System Based On Layered Soil

At present,in the study of soil-cassava root system dynamics simulation model,it mainly adopts the overall modeling method using the average of the soil physical parameters as the modeling of the soil parameters to establish the simulation model.Under the condition of the different hardness of different soil depth,the physical parameters of the soil changes greatly,soil hardness has a great influence on the cassava root harvesting process,ignore the process of soil model parameters,will reduce the accuracy of simulation model,and currently no studies have reported on the layered soil based on soil hardness of cassava roots uprooted mechanism.Therefore,it is greatly significant to carry out the research of dynamics simulation model of layered soil-cassava root system to improve the accuracy of dynamic simulation model.In this paper,the test points is cassava cultivation in Wuming country in Guangxi,a lot of physical tests of the cassava planting soil areas using random sampling,several tests testing methods.Firstly,measuring Physics parameters of the cassava planting soil areas,based on a large number of physical tests data,regression analysis by SPSS analysis,setting up mathematical model of soil hardness and layered soil depth,achieve the increased cubic equation mathematical model of soil hardness and layered soil depth,analyzed the influence regular pattern of Physical parameters of variety soil effect the Layered soil.Then,we built the dynarmics simulation model of soil-cone of stratameter system used methods of Lagrange and SPH coupling algorithm,introduced a new inverse modeling methods of soil parameters.Finally,the parameters of soil is obtained by reverse modeling,then built soil-cassava root system dynamics simulation model based on layered soil to verify the exactness of the reverse method,and the soil layered modeling and overall modeling methods were analyzed.The results showed that:soil hardness with the increase of soil depth in accordance with the change of the cubic equation;the parameters of soil modeling reverse method is feasible,reverse parameter accuracy is higher.Layered modeling method is adopted to establish the dynamics simulation model of layered soil-cassava root system and can be useed for the study of cassava harvesting process.