Table 3.

Colony diameter, halo zone diameter and zinc solubilization index of the 16 actinobacterial isolates on Bunt and Rovira supplemented with 0.1% ZnO and ZnCO₃.

Strain code	Colony diameter (mm)		Halo zone diameter (mm)		Solubilization index (SI)
	ZnO	ZnCO3	ZnO	ZnCO3	ZnO	ZnCO3
AH 23	7.30 ± 1.14 bdf	6.27 ± 0.21 bde	9.45 ± 0.95 deg	8.22 ± 0.82 def	2.30 ± 0.08 bef	2.31 ± 0.10 bde
AH 32	6.77 ± 0.15d	6.00 ± 0.17d	14.33 ± 1.45c	10.64 ± 0.84c	3.11 ± 0.17d	2.77 ± 0.10c
AH 34	7.87 ± 1.16 ade	6.83 ± 0.35 bcd	12.77 ± 1.00 bcde	9.98 ± 1.40 bde	2.63 ± 0.11 cde	2.46 ± 0.14 bc
AH 35	8.57 ± 0.59cd	7.03 ± 0.21acd	11.87 ± 0.59ade	10.31 ± 0.86 ace	2.39 ± 0.12 bef	2.46 ± 0.08 bc
CME 34	9.47 ± 0.49b	8.23 ± 0.45b	22.33 ± 0.61 a	16.23 ± 0.95b	3.36 ± 0.08b	2.97 ± 0.02b
CME 35	7.90 ± 1.05bde	8.03 ± 0.21bc	12.00 ± 0.80 bce	12.38 ± 0.74ab	2.53 ± 0.17 cde	2.54 ± 0.06ab
CME 44	9.13 ± 1.53bc	7.97 ± 0.47ac	15.33 ± 0.94bcd	11.51 ± 0.95ac	2.70 ± 0.17 bdf	2.44 ± 0.05bc
EX 42	6.57 ± 0.49 deg	6.40 ± 0.26bde	11.85 ± 1.31 ade	9.60 ± 0.66 cdf	2.80 ± 0.07 acd	2.50 ± 0.05ab
EX 46	7.90 ± 0.10bde	7.30 ± 0.46 ad	14.55 ± 0.59 ab	10.36 ± 0.86 acd	2.84 ± 0.08ac	2.42 ± 0.03 bcd
EX 51	9.50 ± 0.75a	9.13 ± 0.32a	26.29 ± 1.21a	19.36 ± 0.51a	3.78 ± 0.18a	3.12 ± 0.08a
EX 54	6.17 ± 0.15deg	6.07 ± 0.06 bdf	8.78 ± 0.87 dfg	8.96 ± 0.99def	2.42 ± 0.11 cef	2.43 ± 0.15bcd
NAH 13	6.60 ± 0.53deg	0.00 ± 0.00	7.83 ± 0.61dfg	0.00 ± 0.00	2.19 ± 0.13 defg	0.00 ± 0.00
NAH 22	6.70 ± 0.95acg	7.00 ± 0.20 acd	11.81 ± 0.75 ade	10.44 ± 0.73 acd	2.77 ± 0.15 bde	2.49 ± 0.06ab
OIB 22	7.77 ± 0.95bdef	0.00 ± 0.00	10.91 ± 0.65 bce	0.00 ± 0.00	2.41 ± 0.11 cef	0.00 ± 0.00
OIB34	7.60 ± 0.62bdfg	7.60 ± 0.20 bc	13.75 ± 1.59bc	9.81 ± 0.35bde	2.81 ± 0.16 acd	2.29 ± 0.03bdf
RME 15	8.10 ± 0.61c	7.87 ± 0.21c	17.65 ± 1.08 b	14.22 ± 1.01c	3.18 ± 0.11c	2.81 ± 0.08c

Data presented as means of 3 replicates ± SD., Means sharing the same letter do not differ significantly (p < 0.05).