Table 1. Percentage of extractable nitrate lost relative to the control in soils treated with sulfamethoxazole, sulfadiazine, narasin, and gentamicin.
| Dose (ng·kg−1) | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | |
|---|---|---|---|---|---|---|
| SMX | 1 | 207* (58) | 149 (35) | 13 (50) | 102 (24) | 140 (70) |
| 10 | 12* (26) | 31 (39) | 21 (42) | 55 (32) | 78 (29) | |
| 1000 | 124 (28) | 124 (30) | 199 (81) | 119* (32) | 60* (31) | |
| SDZ | 1 | 125 (31) | 128 (20) | 124 (43) | 106 (28) | 37* (60) |
| 10 | 118 (43) | 105 (23) | 86 (37) | 77 (18) | 42 (39) | |
| 100 | 109 (27) | 98 (19) | 97 (40) | 76 (38) | 104 (44) | |
| 1000 | 57 (64) | 86 (48) | 109 (35) | 83 (21) | 74 (37) | |
| NAR | 1 | 106 (39) | 113 (22) | 117 (46) | 105 (25) | 71 (29) |
| 10 | 127 (61) | 112 (27) | 126 (45) | 104 (29) | 77 (31) | |
| 100 | 120 (41) | 96 (25) | 117 (38) | 68 (33) | 82 (30) | |
| 1000 | 124 (28) | 124 (30) | 199* (81) | 119 (32) | 60* (31) | |
| GTC | 1 | 75 (24) | 111 (42) | 78 (39) | 90 (21) | 62 (52) |
| 10 | 65 (67) | 90 (21) | 59 (96) | 107 (25) | 100 (36) | |
| 100 | 134* (32) | 144 (22) | 115 (38) | 122 (29) | 78 (40) | |
| 1000 | 113 (41) | 107 (15) | 118 (38) | 72 (17) | 107 (37) |
Results shown are the average of three replicates collected at each sampling period with standard error shown in parentheses. Values above 100% (shown in bold) indicate that nitrate losses are stimulated relative to the control whereas values less than 100% point to nitrate losses inhibited relative to the control. Individual treatments deemed by a student t-test to be statistically different (p < 0.05) from the control are denoted with an asterisk.