Table 2.
Composition of the natural humic substances investigated
| Sample | Composition | Physico-chemical properties | Dry granulometry (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Moisture (%) | % Water Absorption | pH | Bulk density (g/l) | >125 µm | 75µm | 45µm | >45µm | ||
| Humic1 | Leonardite | 18.5 | 56 | 3.9 | 663 | 9.3 | 19.5 | 26.1 | 45.1 |
| Humic2 | Humic substances mixture | 14.6 | 44 | 7.1 | 661 | 52.6 | 16.5 | 12.6 | 18.4 |
| Humic3 | Humic substances mixture | 54.9 | 82 | 9.4 | 568 | 26.9 | 9.8 | 18.6 | 44.7 |
| Humic4 | Humic substances mixture | 2.0 | 55 | 7.8 | 799 | 8.1 | 9.0 | 19.9 | 63.0 |
| Humic5 | Lignosulfonate | 7.4 | soluble | 8.2 | 434 | 5.4 | 12.5 | 48.2 | 33.9 |
| Humic6 | Lignosulfonate | 8.0 | soluble | 6.2 | 481 | 6.6 | 41.5 | 28.5 | 23.4 |