Fig. 5. Concentration of fecal coliforms in the leachate from sand-packed, oxidation pond effluent (OPE)-irrigated lysimeters in relation to the daily irrigation rate and daily OC loads. Data are presented for (A) unplanted lysimeters and (B) lysimeters planted with a Eucalyptus tree. The two sets of unplanted lysimeters received the same amounts of effluent as their planted counterparts (at LF 0.2 and at intermittent leaching regimes).