*
0
20
40
60
80
Substrate
Bed
Lettuce
Lettuce + EAS
(c)
0
20
40
60
80
Substrate
Bed
EAS
(f)
*
0
20
40
60
80
Substrate
Bed
Potato
Potato + EAS
(e)
*
0
20
40
60
80
Substrate
Bed
Carrot
Carrot + EAS
(d)
*
*
0
20
40
60
80
Substrate
Bed
Cabbage
Cabbage + EAS
*
*
0
20
40
60
80
Substrate
Bed
Banana peels
Banana peels + EAS
(a)
(b)
Total nitrogen (g/kg)
Fig. 9.4
Total nitrogen in substrate and bed compartments after vermicomposting of FVW and FVW + EAS: (a) banana peels; (b) cabbage; (c) lettuce; (d)
carrot; (e) potato; (f) EAS. Data are presented as mean and standard deviation, n
¼ 3. The asterisk (Ã) denotes the difference between vermicomposting of FVW
and FVW + EAS is statistically significant at 0.05 level (Statistics 21 software). FVW
fruit and vegetable waste, EAS
excess activated sludge
156
W. Li et al.