Fig. 3.

Relative differences in anchorage strengths between root types T1 and T2 in soil types S1 and S2 for the reference patterns (ref. =Ti-0, i = 1,2), i.e. without any root elements removed, and after removing root elements Rj, j = 1,…,5. According to eqn 1, a positive (or negative) percentage value x means that T1 strength anchorage is x % greater (or less) than T2 with regard to the mean strength of T1 and T2. The mean strength differences were calculated from the relative differences in strength of the six patterns.