| rot = pourriture |
| rape = colza |
| red clover = trèfle incarnat |
| redshank = renouée persicaire |
| regrowth = repousse |
| repellant = répulsif |
| replicated trial = essai à répétition |
| resistance = résistance |
| ridger = charrue butteuse |
| rodenticide = rodenticide |
| rogueing = épuration |
| roguing = désherbage manuel |
| rook = freux |
| root = racine |
| root collar = collet de racine |
| root crops = plantes à racines |
| roration = assolement |
| row = rang, ligne |
| row width = inter rang, écartement entre les lignes |
| rust = rouille |
| to renovate = régénérer les prairies |
| to ridge = butter |
| to roll = rouler |
| to run-off = ruisseler |
