- Winter wheat -- Fertilizers -- Oregon, Western4
- Ryegrasses -- Fertilizers -- Oregon, Western3
- Soft wheat -- Fertilizers -- Oregon, Western3
- Blackberries -- Fertilizers -- Oregon, Western2
- Blackberries -- Oregon, Western -- Nutrition2
- Deficiency diseases in plants -- Oregon, Western2
- Raspberries -- Fertilizers -- Oregon, Western2
- Raspberries -- Oregon, Western -- Nutrition2
- Soft wheat -- Soils -- Oregon, Western2
- Soils -- Nitrogen content -- Oregon, Western -- Measurement2
- Winter wheat -- Soils -- Oregon, Western2
- Christmas tree growing -- Oregon, Western1
- Christmas tree growing -- Washington (State)1
- Christmas trees -- Fertilizers -- Oregon, Western1
- Christmas trees -- Fertilizers -- Washington (State)1
- Christmas trees -- Nutrition -- Oregon, Western1
- Christmas trees -- Nutrition -- Washington (State)1
- Cranberries -- Fertilizers -- Oregon, Western1
- Fescue -- Fertilizers -- Oregon, Western1
- Italian ryegrass -- Fertilizers -- Oregon, Western1