Fig. 1

Shoot diameters (means ± standard errors of three replicates per treatment) of olive trees grown in pots for 1026 days and fertilized with two types of sheep wool residues (SWR). A white wool, WW, and B black wool, BW, used at 4 different SWR/soil percentages: 0 (C), 0.5, 1.0, 2.0%. The asterisk indicates least significant differences (LSD) between treatments and control (P < 0.05)