Table 5.
Leaf elemental composition of control maize plants (C, untreated) and plants supplied for 48 h with either HA derived from the amendment control (Amd-C) or HA obtained from amendment OMWF at two dosages (0.5 and 1 mg C L-1).
| Ca | K | Mg | B | Zn | Mn | Cu | Na | ||
|---|---|---|---|---|---|---|---|---|---|
| Leaves | C | 7.66 ± 0.32b | 41.61 ± 1.00b | 4.24 ± 0.21b | 14.1 ± 0.4c | 91.9 ± 20.5b | 66.2 ± 1.5b | 13.3 ± 2.0c | 191.7 ± 16.0a |
| Amd-C | HA 0.5 | 9.05 ± 0.26a | 45.67 ± 1.51a | 5.69 ± 0.28a | 15.01 ± 0.3b | 163.2 ± 15.1a | 63.6 ± 2.8b | 24.2 ± 3.5b | 135.7 ± 17.5b |
| HA 1.0 | 7.90 ± 0.28b | 44.40 ± 1.40a | 4.58 ± 0.39b | 16.19 ± 0.2a | 63.6 ± 19.9b | 74.9 ± 2.6a | 69.8 ± 6.7a | 165.5 ± 9.0b | |
| OMWF | HA 0.5 | 8.75 ± 0.29a | 44.01 ± 1.16a | 5.11 ± 0.24a | 16.07 ± 0.6a | 145.8 ± 15.4a | 66.8 ± 1.8b | 14.3 ± 2.8c | 147.2 ± 34.3b |
| HA 1.0 | 7.43 ± 0.34b | 39.70 ± 3.29b | 4.07 ± 0.31b | 14.55 ± 0.6bc | 99.5 ± 18.6b | 72.3 ± 2.3a | 9.9 ± 5.1c | 144.6 ± 17.6b | |
| Root | C | 5.17 ± 0.39b | 15.23 ± 0.30c | 4.53 ± 0.30c | 30.9 ± 1.8c | 344.0 ± 6.3c | 265.1 ± 15.7c | 262.7 ± 19.8b | 68.4 ± 11.2ab |
| Amd-C | HA 0.5 | 6.33 ± 0.28a | 27.35 ± 1.70a | 6.47 ± 0.68a | 35.2 ± 2.7c | 442.9 ± 25.4a | 450.2 ± 27.6a | 296.8 ± 25.5b | 80.7 ± 11.4a |
| HA 1.0 | 6.47 ± 0.29a | 20.30 ± 1.43b | 5.90 ± 0.47ab | 31.4 ± 2.0c | 431.3 ± 16.5a | 324.7 ± 16.6b | 226.4 ± 33.6b | 88.9 ± 10.3a | |
| OMWF | HA 0.5 | 5.08 ± 0.38b | 20.76 ± 1.32b | 5.26 ± 0.34b | 47.8 ± 3.2a | 361.9 ± 8.2b | 339.6 ± 28.3b | 254.5 ± 31.0b | 59.7 ± 11.6b |
| HA 1.0 | 3.69 ± 1.74b | 19.24 ± 2.11b | 4.45 ± 0.30c | 38.5 ± 2.6b | 117.6 ± 21.4d | 385.1 ± 25.4b | 489.2 ± 42.6a | 48.0 ± 15.1b |
Values are expressed in mg g-1 d.wt. for macroelements, and in mg kg-1 d.wt. for microelements. Data represent the means of five measurements per treatment (±SD). Different letters along the same column indicate significant differences between treatments (p < 0.05) according to Student–Newman–Keuls test.