| Treatment | amendment | Mean leachate volume | Mean leached NO3-N | ||||||||||
| 2017 | 2018 | 2019 | 2017 | 2018 | 2019 | ||||||||
| ml | mg·L−1 | ||||||||||||
| Control | Control | ‡610 a | 501 a | 791 a | 7.5 d | 8.1 d | 7.6 e | ||||||
| Poultry litter (PL) | Control | 521 b | 425 c | 680 c | 14.4 bc | 15.6 bc | 17.6 bc | ||||||
| Fertilizer (FRT) | Control | 600 a | 460 b | 730 b | 21.9 a | 22.8 a | 24.6 a | ||||||
| Poultry litter (PL) | Biochar (BC) | 335 e | 275 e | 420 h | 8.5 d | 10.7 d | 12.2 de | ||||||
| Poultry litter (PL) | Lignite (L) | 347 e | 285 e | 450 g | 10.6 cd | 12.2 cd | 13.4 cd | ||||||
| Fertilizer (FRT) | Biochar (BC) | 488 c | 325 d | 633 d | 16.3 b | 17. b | 17.8 bc | ||||||
| Fertilizer (FRT) | Lignite (L) | 457 d | 315 d | 590 e | 14.3 bc | 16.7 b | 18.7 b | ||||||
| PL + BC + L |
| 358 e | 322 d | 532 f | 7.2 d | 7.4 e | 7.0 e | ||||||
| LSD(0.05) | 28.3 |
| 18.6 | 24.7 | 4.11 | 4.10 | 4.45 | ||||||