Review Article
Role of Earthworms in Soil Fertility Maintenance through the Production of Biogenic Structures
Table 5
C and N contents and C : N ratio in particle-size organic fractions in control soil and cast of
Pontoscolex corethrurus (
SE) [
53].
| Particle size (m) | Laguna Verde | La Mancha |
| C(mg g-1 soil) | Soil | Casts | Soil | Casts | 2000–250 | 32.8 5.1 | 51.2 2.8 | 13.8 8.4 | 7.1 2.4 | 100–50 | 48.8 4.7 | 54.1 1.3 | 1.6 0.6 | 1.5 0.9 | 50–20 | 48.5 7.6 | 63.4 4.8 | 21.9 9.6 | 17.1 2.3 | 20–2 | 50 4.2 | 22.4 13.7 | 15.2 6.7 | 29.5 5.1 | N(mg g-1 soil) | | | | | 2000–250 | 4.72 1.2 | 4.35 0.10 | | | 100–50 | 4.35 0.2 | 5.24 0.60 | 0.21 0.01 | 2.2 0.22 | 50–20 | 4.06 0.4 | 5.04 0.04 | 1.91 0.20 | 2.4 0.20 | 20–2 | 4.20 | 4.76 0.40 | 2.46 1.02 | 2.8 0.9 | C : N ratio | | | | | 2000–250 | 8.8 | 11.8 | | | 100–50 | 10.8 | 10.3 | 7.6 | 6.8 | 50–20 | 12.0 | 12.6 | 11.5 | 7.1 | 20–2 | 11.9 | 4.7 | 6.2 | 10.5 |
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