Table 4.

Box–Behnken design and experimental results of strain HN4-13

No.	Coded levels			Y (%)
	X 1: Peptone (%)	X 2: KCl (%)	X 3: Inoculum size (%)	Inhibition zone (mm)
1	− 1 (0.2)	− 1 (0.2)	0 (5)	22.58
2	+ 1 (0.6)	− 1 (0.2)	0 (5)	18.88
3	− 1 (0.2)	+ 1 (0.3)	0 (5)	21.28
4	+ 1 (0.6)	+ 1 (0.3)	0 (5)	20.14
5	− 1 (0.2)	0 (0.25)	− 1 (4)	23.26
6	+ 1 (0.6)	0 (0.25)	− 1 (4)	20.81
7	− 1 (0.2)	0 (0.25)	+ 1 (6)	20.37
8	+ 1 (0.6)	0 (0.25)	+ 1 (6)	17.71
9	0 (0.4)	− 1 (0.2)	− 1 (4)	21.12
10	0 (0.4)	+ 1 (0.3)	− 1 (4)	22.11
11	0 (0.4)	− 1 (0.2)	+ 1 (6)	20.83
12	0 (0.4)	+ 1 (0.3)	+ 1 (6)	19.22
13	0 (0.4)	0 (0.25)	0 (5)	22.36
14	0 (0.4)	0 (0.25)	0 (5)	21.45
15	0 (0.4)	0 (0.25)	0 (5)	23.17
16	0 (0.4)	0 (0.25)	0 (5)	23.45
17	0 (0.4)	0 (0.25)	0 (5)	23.38