Scientific Reports

Table 2 Studied critical nutrients and their levels for Box-Behnken design.

From: Agro-waste as a substrate for the production of pullulanase by Penicillium viridicatum under solid-state fermentation

Variables	Unit	Actual values			Coded values
FeSO₄	% (w/w)	0.2	0.3	0.4	− 1	0	+ 1
MnSO₄	% (w/w)	0.2	0.3	0.4	− 1	0	+ 1
MgSO₄	% (w/w)	0.2	0.3	0.4	− 1	0	+ 1

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