| Abbreviation | Definition |
|---|---|
| HWTA | How Why The Acorn |
| HYV | High Yielding Variety |
| IAAA | IFOAM Amenity Agriculture Alliance |
| IAAA | Illinois Agricultural Auditing Association |
| IAAE | Iowa Association of Agricultural Educators |
| IAAP | Intensive Agricultural Area Program |
| IAAS | Institute Of Agriculture And Animal Science |
| IAAS | Institute Of Agriculture And Animal Sciences |
| IAASTD | International Assessment of Agricultural Knowledge, Science and Technology for Development |
| IAASTD | International Assessment of Agricultural Science and Technology for Development |
| IAASTD | International Assessment of Agricultural Science Technology for Development |
| IABF | Iowa Agricultural Bio Fibers |
| IAC | Iowa Agricultural College |
| IACC | Industrial Agricultural Communication Center |
| IACC | Industrial Agriculture Communications Center |
| IACC | International Agricultural Coordinating Committee |
| IACR | Institute of Arable Crops Research |
| IACR | Integrated Approach to Crop Research |
| IAD | International Agricultural Development |
| IADF | Indian Agricultural Development Foundation |