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amelioration : 78 phrases in 21 subjects |
| Agriculture | 3 |
| Agrochemistry | 1 |
| Aviation | 1 |
| Biotechnology | 1 |
| Ecology | 22 |
| Fish farming pisciculture | 1 |
| Forestry | 3 |
| General | 8 |
| Immunology | 1 |
| Insurance | 1 |
| Linguistics | 1 |
| Makarov | 4 |
| Medical | 9 |
| Military | 2 |
| Mining | 1 |
| Natural resourses and wildlife conservation | 11 |
| Politics | 3 |
| Road works | 1 |
| Soil science | 1 |
| Technology | 1 |
| Water resources | 2 |