M₃

M₄

M₅

M₆

[14]

[7]

Treatment T₁ (3/4 sand + 1/4 compost)

Compost N˚1

100%

100%

100%

100%

84% - 95%

90%

Compost N˚2

90%

90%

90%

100%

Compost N˚3

70%

70%

80%

100%

Treatment T₂ (1/2 sand + 1/2 compost)

Compost N˚1

80%

70%

100%

100%

-

80%

Compost N˚2

90%

90%

90%

100%

Compost N˚3

10%

60%

70%

100%

Treatment T₃ (1/4 sand + 3/4 compost)

Compost N˚1

70%

70%

100%

90%

31% - 55%

-

Compost N˚2

90%

90%

90%

90%

Compost N˚3

20%

0%

60%

50%

Treatment T₄ (only compost)

Compost N˚1

70%

60%

90%

90%

27% - 45%

80%

Compost N˚2

40%

30%

90%

100%

Compost N˚3

0%

0%

90%

50%

Control treatment (only sandl)

100%

98%

80%