Experimental Study On The Pressure Of The Plant's Roots On The Soil

The roots grow in the soil,with the increase of root diameter and the root length andother mechanical growth,causing extrusion and disturbance to the soil,the extrusion anddisturbance pressure that is the pressure of roots growth. During the process of rootsgrowth,the roots occupy the gaps in the soil,make the soil particles moved,lead to soilparticles' size and arrangement change,so that affect the physical properties of the soil,thenaffects the water,fertilizer,gas and heat of the soil and other fertility factors.Now,the researchof pressure of the root growth disturbing the soil is less.The system research will be helpfulfor better understanding the mechanism of Conservation tillage,and meanwhile,promote thefusion of biomechanics and crops cultivation.On the basis of the theory analysis and simulation test,This study used self-madepressure measurement device to measure the pressure of the root disturbing the soil throughthe tube planted test.This study was conducted under the condition of no root,testing thedisturbance of water infiltration on soil,this study analyzed the pressure inside soil during theprocess of soil water infiltration.Analyzed the changes of the comprehensive pressure of thecommon plant root growth disturbing the soil,at the same time,in order to better reserve theinfluence factors of comprehensive pressure,analyzed the changes of the comprehensivepressure of the corn roots disturbing the soil under different density. The result is:(1) While the soil with the same density with the water infiltrating,the comprehensivepressure changes with different soil layers.In the early period of the moisture contentdetermination0-20min,comprehensive pressure decreased with the deepening of soil depth;During the middle of the determination30-360min,the pressure of the middle layers of thesoil is largest;In the later period of the determination360-420min,pressure increases with thedeepening of soil depth.(2) During the process of water infiltration,the comprehensive pressure changes withdifferent soil density for the soil of the same layers. In surface soil,comprehensive pressureincrease with the increase of density;In the middle and bottom soil, when the density isgreater the comprehensive pressure is smaller during0-90min of the determination time,90 min later comprehensive pressure increases with the increase of the soil density.(3) Through measure and analysis the pressure of the corn's,tomato's,pepper's amdwheat's roots growth,The pressure of four plants has different change range with differentgrowth period.In high growth rate,the pressure has a relatively change rate.Finally thedetermined,Accumulated value of corn is bigger than tomato and tomato is bigger than chillyand wheat is smallest.(4) For different soil density,the comprehensive pressure of corn is different. In earlycorn growth period,the density has larger influence on the comprehensive pressure,the densityis bigger,the comprehensive pressure is smaller; In the middle of the growth period,alongwith the increase of density,comprehensive pressure become bigger;later of the growingperiod,comprehensive pressure become smaller with the decrease of density.(5) With the increase of the roots volume,the comprehensive pressure is increased,andthem show a power function relation:P=2.1373V^0.1648(P:the pressure of roots on thesoil,Unit:kPa,V:the volume of corn's roots,Unit:cm3)...