| | 630 | agriculture | |
| ↑ | 630 | agriculture in general | → 338.1 343.076 580 ≈ S.SPEC.21.AE |  |
| ↑ | 630.91 | regional and tropical agriculture
| |  |
| ↑ | 631 | techniques, tools, materials | |  |
| ↑ | 631.4 | soil science | → 551.3 ≈ S.SPEC.40.EB |  |
| ↑ | 631.41 | soil chemistry | |  |
| ↑ | 631.5 | cultivation and harvesting | → 627.5 |  |
| ↑ | 631.52 | seed and variety production, agricultural genetics | → 581.3 |  |
| ↑ | 631.53 | plant breeding | |  |
| ↑ | 632 | plant pathology, biological and chemical control | → 581 668.6 ≈ S.SPEC.34.HA |  |
| ↑ | 632.32 | bacterial diseases of plants | → 579.3 ≈ S.SPEC.21.AD |  |
| ↑ | 632.7 | noxious insects, agricultural entomology | → 595 |  |
| ↑ | 632.9 | pesticides | ≈ S.SPEC.27.AP |  |
| ↑ | 632.95 | pesticides | → 363.7 |  |
| ↑ | 633 | field and plantation crops | |  |
| ↑ | 633.1 | grain growth | ≈ S.SPEC.28.AT |  |
| ↑ | 633.5 | fiber cultivations | → 338.17 |  |
| ↑ | 633.7 | cultivation of alkaloid plants, tobacco, cacao | ≈ S.SPEC.23.AG S.SPEC.25.AI |  |
| ↑ | 634 | arboriculture, fruit farming | ≈ S.SPEC.27.AO |  |
| ↑ | 634.8 | viticulture | → 663.2 |  |
| ↑ | 635 | horticulture, vegetables, gardening | ≈ S.SPEC.43.IE |  |
| ↑ | 635.9 | ornamental plants, floriculture | → 582.13 712 ≈ S.FLORE.B |  |
| ↑ | 635.93 | groups of flowers and ornamental plants | |  |
| ↑ | 635.933 | ornamental dicotyledons | |  |
| ↑ | 635.93334 | ranunculaceae, hellebores, anemones | |  |
| ↑ | 635.93335 | papaveraceae | |  |
| ↑ | 635.93364 | Rosales, rose | |  |
| ↑ | 635.93372 | Geraniales, pelargonium | |  |
| ↑ | 635.93373 | Myrtales, fuchsias | |  |
| ↑ | 635.93392 | Cornales, hortensias | |  |
| ↑ | 635.93393 | Ericales | |  |
| ↑ | 635.93395 | Lamiids, gentians, jasmines | |  |
| ↑ | 635.93398 | campanulids, asteraceae | |  |
| ↑ | 635.934 | ornamental monocotyledons | |  |
| ↑ | 635.9346 | Liliales | |  |
| ↑ | 635.9347 | Asparagales, orchids | |  |
| ↑ | 636 | husbandry, breeding | ≈ S.SPEC.32.BF |  |
| ↑ | 639 | hunting, fishing, conservation | |  |
| ↑ | 639.2 | commercial fishing | |  |
| ↑ | 639.9 | conservation | → 333.72 |  |