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Overview of measured organic matter contents (%) in four Dutch ditches and the experimental ditches of the WUR 1 year after their construction and 5 years later
| Depth (cm) | 4 NL ditches | Exp. ditches 1990 | Exp. ditches 1995 |
|---|---|---|---|
| 0–1 | 10–30 | 3.7–5.5 | 26 |
| 1–2 | 9–29 | 1.5–1.8 | 19 |
| 2–3 | 8–26 | 1.5–1.8 | 6 (for 2–4 cm layer) |
