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Table 1 Screening of the concentrations of four single trace elements and orthogonal table of trace elements concentration compounds

From: Effect of four trace elements on Paenibacillus polymyxa Pp-7250 proliferation, activity and colonization in ginseng

Trace elements (mg/L) 1 2 3 4 5 6 7 8
Concentration of Cu2+, Fe2+, Mn2+ and Zn2+
 Cu2+ 0 10 30 50 100 500 2500 5000
 Fe2+ 0 10 30 50 100 500 2500 5000
 Mn2+ 0 10 30 50 100 500 2500 5000
 Zn2+ 0 50 100 500 1000 2000 3000 4000
Test number Cu2+ (A) Fe2+ (B) Zn2+ (C) Mn2+ (D)
Factors and levels of orthogonal test
 1 10 30 50 30
 2 10 50 100 50
 3 10 100 150 100
 4 30 30 100 100
 5 30 50 150 30
 6 30 100 50 50
 7 50 30 150 50
 8 50 50 50 100
 9 50 100 100 30