Table 3 pH, EC, ash content, total macro- and micronutrients, total Cd, total Pb, total polyphenols and antioxidant activity content in BSG 1:25 FPR 1:100 and LPR 1:200 aqueous extracts
Aqueous extracts | Â | BSG 1:25 | FPR 1:100 | LPR 1:200 |
|---|---|---|---|---|
pH |  | 5.5 ± 0.1 | 5.5 ± 0.2 | 3.3 ± 0.1 |
EC | dS m−1 | 0.2 ± 0.0 | 0.6 ± 0.1 | 0.5 ± 0.0 |
Ash | % | 18.5 ± 0.2 | 25.0 ± 1.1 | 9.3 ± 0.3 |
Total N |  | 40.0 ± 0.4 | 157 ± 10 | 10.0 ± 0.2 |
Total P |  | 47.2 ± 0.2 | 43.6 ± 0.3 | 3.78 ± 0.2 |
Total K |  | 19.4 ± 1.8 | 330 ± 8.7 | 50.1 ± 4.5 |
Total Ca |  | 58.3 ± 0.4 | 8.22 ± 0.55 | 34.7 ± 2.7 |
Total Mg |  | 34.3 ± 0.40 | 5.41 ± 0.8 | 5.49 ± 0.60 |
Total Na |  | 5.44 ± 1.1 | 72.0 ± 2.3 | 5.46 ± 0.48 |
Total Cu | mg L−1 | 0.05 ± 0.01 | 0.11 ± 0.00 | 0.05 ± 0.00 |
Total Fe |  | 0.44 ± 0.08 | 0.43 ± 0.10 | 0.55 ± 0.04 |
Total Mn |  | 0.32 ± 0.01 | 0.17 ± 0.00 | 0.03 ± 0.00 |
Total Ni |  | 0.03 ± 0.01 | 0.06 ± 0.00 | 0.02 ± 0.00 |
Total Zn |  | 0.18 ± 0.05 | 0.27 ± 0.06 | 0.27 ± 0.05 |
Total Cd | Â | <0.005 | <0.005 | <0.005 |
Total Pb |  | 0.01 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.00 |
Total polyphenols | g kg−1 | 10.57 ± 1.96c | 57.88 ± 5.61a | 49.54 ± 3.13b |
Antioxidant activity | mM trolox L−1 | 1.81 ± 0.31c | 5.55 ± 1.01a | 3.77 ± 0.44b |