Biostimulation treatment k (day-1) R2 t1/2 (days)
Animal Waste:
Pig dung
Cow dung

0.0498
0.0266

0.9572
0.9926

13.9
26.1
Crop Residue Waste:
Cassava peel
Groundnut shell
Melon shell
Beans shell

0.0288
0.0260
0.0257
0.0251

0.9519
0.9693
0.9670
0.9886

24.1
26.7
27.0
27.6
Animal and Crop Residue Wastes Combination:
Pig dung+Cassava peel
Cow dung+Groundnut shell
Cow dung+Melon shell
Cow dung+Cassava peel
Pig dung+Beans shell
Pig dung+Groundnut shell


0.0394
0.0328
0.0296
0.0289
0.0277
0.0262


0.9306
0.9678
0.9967
0.9588
0.9518
0.9962


17.6
21.1
23.4
24.0
25.0
26.5
Crop Residue Wastes Combination:
Melon shell+Groundnut shell
Groundnut shell+Beans shell
Groundnut shell+Cassava peel
Melon shell+Beans shell
Beans shell+cassava peel

0.0351
0.0299
0.0291
0.0270
0.0247

0.9826
0.9510
0.9651
0.9730
0.9873

19.7
23.2
23.8
25.7
28.1
Animal Wastes Combination:
Pig dung+Cow dung

0.0283

0.9563

24.5
Inorganic Chemical Fertilizer:
NPK Fertilizer (20:10:10)

0.0228

0.9820

30.4
Unamended Soil (Control 1) :
Natural attenuation

0.0144

0.9993

48.1
Table 3: The biodegradation rate constants (k) and half-life (t1/2) time of the various treatments.