AGRIS SUBJECT CATEGORIES
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| A | Agriculture |
| A01 | Agriculture - General aspects |
| A50 | Agricultural research |
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| B | Geography and history |
| B10 | Geography |
| B50 | History |
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| C | Education, extension, and advisory work |
| C10 | Education |
| C20 | Extension |
| C30 | Documentation and information |
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| D | Administration and legislation |
| D10 | Public administration |
| D50 | Legislation |
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| E | Economics, development, and rural sociology |
| E10 | Agricultural economics and policies |
| E11 | Land economics and policies |
| E12 | Labour and employment |
| E13 | Investment, finance and credit |
| E14 | Development economics and policies |
| E16 | Production economics |
| E20 | Organization, administration and management of agricultural enterprises or farms |
| E21 | Agro-industry |
| E40 | Cooperatives |
| E50 | Rural sociology |
| E51 | Rural population |
| E70 | Trade, marketing and distribution |
| E71 | International trade |
| E72 | Domestic trade |
| E73 | Consumer economics |
| E80 | Home economics, industries and crafts |
| E90 | Agrarian structure |
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| F | Plant production |
| F01 | Crop husbandry |
| F02 | Plant propagation |
| F03 | Seed production |
| F04 | Fertilizing |
| F06 | Irrigation |
| F07 | Soil cultivation |
| F08 | Cropping patterns and systems |
| F30 | Plant genetics and breeding |
| F40 | Plant ecology |
| F50 | Plant structure |
| F60 | Plant physiology and biochemistry |
| F61 | Plant physiology - Nutrition |
| F62 | Plant physiology - Growth and development |
| F63 | Plant physiology - Reproduction |
| F70 | Plant taxonomy and geography |
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| H | Protection of plants and stored products |
| H01 | Protection of plants - General aspects |
| H10 | Pests of plants |
| H20 | Plant diseases |
| H50 | Miscellaneous plant disorders |
| H60 | Weeds |
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| J | Handling, transport, storage and protection of agricultural products |
| J10 | Handling, transport, storage and protection of agricultural products |
| J11 | Handling, transport, storage and protection of plant products |
| J12 | Handling, transport, storage and protection of forest products |
| J13 | Handling, transport, storage and protection of animal products |
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| J14 | Handling, transport, storage and protection of fisheries and aquacultural products |
| J15 | Handling, transport, storage and protection of non-food or non-feed agricultural products |
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| K | Forestry |
| K01 | Forestry - General aspects |
| K10 | Forestry production |
| K11 | Forest engineering |
| K50 | Processing of forest products |
| K70 | Forest injuries and protection |
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| L | Animal production |
| L01 | Animal husbandry |
| L02 | Animal feeding |
| L10 | Animal genetics and breeding |
| L20 | Animal ecology |
| L40 | Animal structure |
| L50 | Animal physiology and biochemistry |
| L51 | Animal physiology - Nutrition |
| L52 | Animal physiology - Growth and development |
| L53 | Animal physiology - Reproduction |
| L60 | Animal taxonomy and geography |
| L70 | Veterinary science and hygiene |
| L72 | Pests of animals |
| L73 | Animal diseases |
| L74 | Miscellaneous animal disorders |
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| M | Aquatic sciences and fisheries |
| M01 | Fisheries and aquaculture - General aspects |
| M11 | Fisheries production |
| M12 | Aquaculture production and management |
| M40 | Aquatic ecology |
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| N | Machinery and buildings |
| N01 | Agricultural engineering |
| N02 | Farm layout |
| N10 | Agricultural structures |
| N20 | Agricultural machinery and equipment |
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| P | Natural resources |
| P01 | Nature conservation and land resources |
| P05 | Energy resources and management |
| P06 | Renewable energy resources |
| P07 | Non-renewable energy resources |
| P10 | Water resources and management |
| P11 | Drainage |
| P30 | Soil science and management |
| P31 | Soil surveys and mapping |
| P32 | Soil classification and genesis |
| P33 | Soil chemistry and physics |
| P34 | Soil biology |
| P35 | Soil fertility |
| P36 | Soil erosion, conservation and reclamation |
| P40 | Meteorology and climatology |
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| Q | Food science |
| Q01 | Food science and technology |
| Q02 | Food processing and preservation |
| Q03 | Food contamination and toxicology |
| Q04 | Food composition |
| Q05 | Food additives |
| Q51 | Feed technology |
| Q52 | Feed processing and preservation |
| Q53 | Feed contamination and toxicology |
| Q54 | Feed composition |
| Q55 | Feed additives |
| Q60 | Processing of non-food or non-feed agricultural products |
| Q70 | Processing of agricultural wastes |
| Q80 | Packaging |
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| S | Human nutrition |
| S01 | Human nutrition - General aspects |
| S20 | Physiology of human nutrition |
| S30 | Diet and diet-related diseases |
| S40 | Nutrition programmes |
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| T | Pollution |
| T01 | Pollution |
| T10 | Occupational diseases and hazards |
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| U | Auxiliary disciplines |
| U10 | Mathematical and statistical methods |
| U30 | Research methods |
| U40 | Surveying methods |