Table 4.
Multidrug resistance (%) of Escherichia coli in different dose groups.
| Sampling time | Blank group | Lowest-dose group | Low-dose group | Medium-dose group | High-dose group |
|---|---|---|---|---|---|
| 0 day | 0% | 0% | 0% | 0% | 0% |
| 1 day | 0% | 60% | 0% | 50% | 57.14% |
| 8 days | 0% | 69.23% | 0% | 81.82% | 0% |
| 15 days | 0% | 0% | 50% | 50% | 0% |
| 22 days | 0% | 0% | 66.67% | 100% | 81.82% |
| 29 days | 0% | 60% | 57.14% | 100% | 100% |
| 36 days | 0% | 100% | 100% | 83.33% | 100% |
| 54 days | 0% | 100% | 100% | 100% | 100% |
| 85 days | 0% | 100% | 100% | 100% | 100% |
Blank group; total nitrogen (TN) amended with NH4NO3 to maintain the N concentration at 0.65 mg L-1 and total phosphorus (TP) amended with KH2PO4 to maintain the P concentration at 0.015 mg L-1, (ii) Lowest-dose group; addition of 1.5 mg L-1 N and 0.15 mg L-1 P (iii) Low-dose group; addition of 2.5 mg L-1 N and 0.25 mg L-1 P (iv) Medium-dose group; addition of 3.5 mg L-1 N and 0.35 mg L-1 P and (v) High-dose group; addition of 4.5 mg L-1 N and.45 mg L-1 P.