Table 1: Mixed percentages of substrates.

Substrates Composition
S1 100% of sterile Maamora forest soil
S2 99% of sterile Maamora forest soil and 1% of sterile phosphate sludge
S3 97% of sterile Maamora forest soil and 3% of sterile phosphate sludge
S4 95% of sterile Maamora forest soil and 5% of sterile phosphate sludge
S5 90% of sterile Maamora forest soil and 10% of sterile phosphate sludge