Time interval

(years)

Soil organic matter (%)

without waste incorporation

with waste incorporation

difference between with and without incorporation of waste

1 - 5

4.74

4.88

0.14

6 - 10

4.14

4.41

0.27

11 - 15

3.83

4.17

0.34

16 - 20

3.63

4.04

0.41

21 - 25

3.49

3.96

0.47

26 - 30

3.41

3.92

0.51