Percent evaporative water loss saving by treatment and depth compared to control for shredded bark, gravel, wood chips and fine bark at depths of 3.8 cm and 7.6 cm, in 20 L containers.
| Mulch type | Mulch depth | |
|---|---|---|
| 3.8 cm | 7.6 cm | |
| Shredded bark | 43.8% | 43.8% |
| Gravel | 48.7% | 52.6% |
| Wood chips | 27.3% | 26.7% |
| Fine bark | 33.1% | 35.9% |