| Abbreviation | Definition |
|---|---|
| PD | Plant Density |
| PDA | PA Department of Agriculture |
| PDA | Pennsylvania Department of Agriculture |
| PDA | Potato Dextrose Agar |
| PDAFF | Provincial Department of Agriculture Forestry and Fisheries |
| PDAFF | Provincial Departments of Agriculture Forestry and Fisheries |
| PDCA | Purebred Dairy Cattle Association |
| PDCA | Purebred Dexter Cattle Association |
| PDL | Pneumatic Differential Lock |
| PDP | Pesticide Data Program |
| PDSI | Palmer Drought Severity Index |
| PEAT | Progressive Environmental Agricultural Technologies |
| PEAT | Progressive Environmental and Agricultural Technologies |
| PEPA | Programa Educativo para Agricultores |
| PEPFAA | Prevention of Environmental Pollution From Agricultural Activities |
| PEPFAA | Prevention of Environmental Pollution from Agricultural Activity |
| PERO | Provincial Economic Review and Outlook |
| PFB | PA Farm Bureau |
| PFI | Practical Farmers of Iowa |
| PFL | Product of Farm Labor |