Table 1. Average concentration for elemental composition obtained from EDX analysis (Wt%).

Element	Statistic	B-Control	G-Control	B-AA	W-AA
C	Mean ± SD 95% CI	59.60 ± 1.15 59.07−60.14	59.81 ± 1.85 58.95–60.68	61.14 ± 1.64 60.37–61.90	56.72 ± 2.86 55.38–58.06
N	Mean ± SD 95% CI	13.42 ± 1.28 12.82–14.02	13.78 ± 1.08 13.27–14.28	13.09 ± 1.30 12.48–13.69	11.61 ± 1.19 11.05–12.16
O	Mean ± SD 95% CI	15.30 ± 1.26 14.71–15.89	14.37 ± 1.01 13.90–14.84	13.56 ± 1.67 12.77–14.34	11.23 ± 1.35 10.60–11.86
S	Mean ± SD 95% CI	9.43 ± 1.54 8.71–10.16	9.51 ± 0.74 9.17–9.86	9.84 ± 3.13 8.37–11.30	17.56 ± 3.11 16.11–19.02
Fe	Mean ± SD 95% CI	0.13 ± 0.05 0.10–0.15	0.11 ± 0.04 0.09–0.13	0.13 ± 0.05 0.10–0.15	0.20 ± 0.07 0.17–0.23
Cu	Mean ± SD 95% CI	0.42 ± 0.12 0.37–0.48	0.50 ± 0.07 0.46–0.53	0.48 ± 0.14 0.41–0.54	0.67 ± 0.16 0.60–0.75
Zn	Mean ± SD 95% CI	0.25 ± 0.05 0.23–0.27	0.29 ± 0.05 0.27–0.32	0.28 ± 0.07 0.25–0.31	0.45 ± 0.09 0.41–0.49