--l = * ; = d [[&s(?'-tfi,i] /i;·,,,A £, [ ,.---= d -I;,,. " J;;= - - - ill Si @= OJL;:uiJ :.il9Jll .cb.ol aSpil ;;: ;= _, M M ::--17 -t?: 0 ex 0: -r ---- .\ ,, , , , \ \ \ T '. :J_ I \ \ I \ I \ I d _j_ Vo h Figure 8.41 - Segment of soil on the inclined tillage plane tillage tool (Soehne, 1956, cited in Gill and Vandenberg, 1968).