Factor Name Level 1 2 3 Aeration F1 Aerobic Anaerobic ----- Humidity (ml) F2 0.05 .1 .5 Glucose (g) F3 0.001 0.01 0 Bacteria (ml) F4 0 0.01 0.02 Composting (g) F5 0 0.001 0.01 Temp.(°C) F6 15 25 35 Salt (g) F7 0.05 0.01 0.001 Urea (g) F8 0.05 0.01 0.001

Table 2: Factors and their levels in the first step of experiment per g of soil