Table 1. Factors and levels of orthogonal test.
Levels
Factors
A H2O (%, w/w)
B Load (g, dry weight)
C (NH4)2SO4 (%, w/w)
D KH2PO4 (%, w/w)
1
50
10
1.0
0.1
2
55
15
1.5
0.2
3
60
20
2.0
0.3
