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. 2012 Aug 30;37(2):199–207. doi: 10.1007/s12639-012-0165-5

Table 1.

Levels and values of variables in Plackett–Burman design (concentrations in g/L)

Level Glucose NaNO3 KH2PO4 MgSO4 NaCl ZnSO4 FeSO4 CuSO4 pH
High 28.00 2.80 1.40 0.70 0.70 0.05 0.07 0.05 7.00
Low 12.00 1.20 0.60 0.30 0.30 0.03 0.05 0.03 4.00