Measurements of 6-components of soil resistance of plow (I)

Abstract

The soil resistances of a plow are the three dimensional forces. Using the 6 comp. tillage meter, I measured characteristics of the plow resistances with a 9″ plow (without a coulter and a landside) on sandy soil, varing the plowing depth 5-10cm. The results are as follow. (The datas are mean values with each 5m running) (1) The centers of resistances of a plow distribute upon it surface, with-in one-third to two-thirds of the plowing depthes and a quarter to one-half of the plow width from the land side (Fig. 2). (2) The longitudinal resistances R_L have larger value and tendency to increase more rapidly with depth than the vertical and side forces R_V and R_S (Fig. 3). (3) The directions of the vectors of the partial resultants in vertical and horizontal plane, R_D and R_H are presented with angles α and β. α increase with t, reache max. and decrease with more depth. β are vice versa. (4) The specific resistances κ have min. values to t=10cm. (5) The moments about a setting the point of the plow body to beam, M_y are larger than M_x, and M_z, but not increase so rapidly as R_L to t (Fig. 5).