|
| To treatment (sand only) | T1 treatment (3/4 sand + 1/4 compost) | T2 treatment (1/2 sand + 1/2 compost) | T3 treatment (1/4 sand + 3/4 compost) | T4 treatment (compost only) |
| Volume of sand (cm3) | 400 | 300 | 200 | 100 | 400 |
| compost volume (cm3) | 0 | 100 | 200 | 300 | 0 |