Review Article
The Role of Earthworms in Tropics with Emphasis on Indian Ecosystems
Table 5
Physicochemical and climatic characteristics (average) of the study sites 1 to 10 (1997–1999) (refer to Table
6 for study site description) [
22].
| Parameter observed* | Study sites | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1997 | | | | | | | | | | | pH | 7.78 | 7.63 | 7.13 | 6.86 | 7.59 | 7.67 | 6.78 | 7.04 | 7.50 | 6.55 | EC (dS/m) | 0.34 | 0.20 | 0.38 | 0.11 | 0.21 | 0.18 | 0.32 | 0.14 | 0.27 | 0.39 | OC (%) | 1.42 | 2.29 | 4.44 | 2.75 | 1.47 | 2.94 | 3.42 | 3.05 | 4.20 | 7.99 | TN (%) | 0.41 | 0.35 | 0.23 | 0.23 | 0.25 | 0.40 | 0.42 | 0.31 | 0.22 | 0.40 | ST () | 28.90 | 29.83 | 27.84 | 29.29 | 30.31 | 29.27 | 29.83 | 23.47 | 22.49 | 21.30 | SM (%) | 8.10 | 6.34 | 10.34 | 7.22 | 7.16 | 8.30 | 10.25 | 15.75 | 15.46 | 14.99 |
| 1998 | | | | | | | | | | | pH | 7.95 | 7.51 | 7.25 | 6.66 | 7.51 | 7.62 | 6.45 | 7.15 | 7.34 | 6.44 | EC (dS/m) | 0.36 | 0.22 | 0.38 | 0.13 | 0.25 | 0.16 | 0.33 | 0.18 | 0.31 | 0.39 | OC (%) | 1.74 | 2.19 | 4.24 | 2.79 | 1.43 | 2.35 | 4.25 | 3.19 | 4.22 | 8.48 | TN (%) | 0.44 | 0.34 | 0.24 | 0.27 | 0.27 | 0.41 | 0.41 | 0.27 | 0.27 | 0.38 | ST () | 29.23 | 30.18 | 28.27 | 30.63 | 29.92 | 29.30 | 30.18 | 24.14 | 22.68 | 21.30 | SM (%) | 12.14 | 9.93 | 15.18 | 9.73 | 12.83 | 12.03 | 14.35 | 16.00 | 17.09 | 16.29 |
| 1999 | | | | | | | | | | | pH | 7.85 | 7.49 | 7.37 | 6.85 | 7.38 | 7.59 | 6.47 | 6.98 | 7.45 | 6.64 | EC (dS/m) | 0.35 | 0.23 | 0.34 | 0.14 | 0.24 | 0.17 | 0.35 | 0.16 | 0.26 | 0.39 | OC (%) | 1.40 | 2.45 | 4.34 | 2.90 | 1.36 | 3.02 | 4.05 | 3.45 | 4.37 | 9.99 | TN (%) | 0.46 | 0.37 | 0.27 | 0.26 | 0.26 | 0.43 | 0.41 | 0.31 | 0.28 | 0.39 | ST () | 27.42 | 28.55 | 26.49 | 29.66 | 30.42 | 27.46 | 28.55 | 25.21 | 23.51 | 22.80 | SM (%) | 9.50 | 7.27 | 11.70 | 8.50 | 9.27 | 9.37 | 10.34 | 12.56 | 14.37 | 13.86 |
|
|
*EC: Electrical conductivity; OC: Organic carbon; TN: total nitrogen; ST: Soil temperature; SM: Soil moisture.
|