Review Article
Effect of Soil Physical State on the Earthworms in Hungary
Table 4
Relationship between the soil clay content, soil state, and earthworm count, under maize (1994–1999, June [
34]).
| Clay %, v/v | Rank of soil states based on earthworm counts | 30 | 50 | 60 | Earthworm count per m2 (0–20 cm) |
| 26 | 36 | 28 | (1) Undisturbed soil, loosened to a depth of 45 cm, covered to an extent of 55% |
| 25 | 34 | 26 | (2) Soil loosened down to 40 cm, covered up to 35% (plant residue mixed in the soil: 3 t ha-1) |
| 24 | 30 | 26 | (3) Soil tilled with cultivator to a depth of 18–22 cm, under 35% coverage (plant residue mixed in the soil: 3 t ha-1) |
| 21 | 26 | 23 | (4) Soil tilled with cultivator to a depth of 16–18 cm, under 20% coverage (plant residue mixed in the soil: 3 t ha-1) |
| 16 | 22 | 16 | (5) Soil ploughed to a depth of 22–25 cm (plant residue inverted to the soil: 5 t ha-1) |
| 16 | 20 | 9 | (6) Undisturbed, uncovered, settled soil (field residues removed) |
| 6 | 10 | 7 | (7) Soil ploughed to a depth of 22–25 cm (plant residues removed) |
| 0 | 0 | 0 | (8) Plough pan and disk pan |
| 1.786 | 1.908 | 1.216 | LSD5% |
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