On the Displacement of Soil by the Tillage machines (I)

On the Expressions of the Displacement of Soil

Abstract

The purpose of this paper is to describe how to express the tilling faculties in case of the soil tilled by the tillage machines. On the expression of tilling faculties, the authors cannot find the fixed rules, but many considerations have to be taken in to account, such as;
the tillage depth, the condition of tillage-pan, the hardness of tilled soil, the mixing ratio of soil, the scattering ratio of soil, the inverting ratio of soil, and the burying ratio of surface soil.
The authors have introduced the following equations to indicate the soil displacement by the tillage machines.
(1) Let the mixing ratio or the scattering ratio of the soil displacement measuring pieces be M.
Then M=100-α√S
Where, α is the coefficient which is determined by the number or chalk-pieces and divided by the number of stratums of soil, S is the sum of squares.
(2) The burying ratio of surface soil=1/m∑mi=1100di/H
Where, m is the number of chalk-pieces, d is the burying depth of chalk-pieces, H is the depth of tilled soil.
(3) The exposed ratio=the number of exposed pieces/the number of total pieces×100
We calculated the values of these equations from the inverted furrow at 135° with a plow. These values. indicate the characteristic of soil displacement fairly well, but these values differ in the number of divided stratums.