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 VerdeLa Mancha

C(mg g-1 soil) Soil Casts Soil Casts
2000–25032.8 5.151.2 2.813.8 8.47.1 2.4
100–5048.8 4.754.1 1.31.6 0.61.5 0.9
50–2048.5 7.663.4 4.821.9 9.617.1 2.3
20–250 4.222.4 13.715.2 6.729.5 5.1
N(mg g-1 soil)
2000–2504.72 1.24.35 0.10
100–504.35 0.25.24 0.600.21 0.012.2 0.22
50–204.06 0.45.04 0.041.91 0.202.4 0.20
20–24.204.76 0.402.46 1.022.8 0.9
C : N ratio
2000–2508.811.8
100–5010.810.37.66.8
50–2012.012.611.57.1
20–211.94.76.210.5