*2.4. Soil Enzymatic Activity*

Soil enzyme activity in the treatments was measured as follows:


## *2.5. Biological Index of Fertility (BIF)*

BIF was determined by employing dehydrogenase activity (DHA) and catalase activity (CAT) [24] using the formula: (DHA + kCAT)/2, where k is the proportionality factor (= 0.01).
