Dependent variable Low Level (  1) Medium Level(0) High Level (+ 1) Dependent variable Low Level (  1) Medium Level(0) High Level (+ 1) NPK Fertilizer (A) 2.0 4.0 6.0 Tween 80 (B ) 5.0 10 15 Hydrogen Peroxide ( C) 0.5 1.0 1.5

Table 1: Experimental range and the levels of the variables.