Table 1.

Various media components studied in PBD experiments and their chosen high and low concentration levels.

Variables code	Media constituents	Low level (−)	High level (+)
A	(NH4)5Fe(C6H4O7)2 (g/l)	1	3
B	KH2PO4 (g/l)	5	7
C	Na2HPO4 (g/l)	2	3
D	MgSO4.7H2O (g/l)	0.05	1.5
E	CaCl2 (mg/l)	1	1.4
F	FeSO4.7H2O (mg/l)	1.5	1.8
G	MnSO4.4H2O (mg/l)	1	2
H	pH	6	8
J	Inoculum size (%)	1	5
K	Incubation Period (h)	36	60
L	Molasses (%)	3	5