- Winter wheat -- Fertilizers -- Oregon, Western4
- Ryegrasses -- Fertilizers -- Oregon, Western3
- Soft wheat -- Fertilizers -- Oregon, Western3
- Alfalfa -- Fertilizers -- Oregon, Western2
- Blackberries -- Fertilizers -- Oregon, Western2
- Blackberries -- Oregon, Western -- Nutrition2
- Cranberries -- Fertilizers -- Oregon2
- Deficiency diseases in plants -- Oregon, Western2
- Nitrogen fertilizers -- 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
- Agrostis -- Fertilizers -- Oregon, Western1
- Beans -- Fertilizers -- Oregon, Western1
- Beets -- Fertilizers -- Oregon, Western1
- Blueberries -- Fertilizers -- Oregon, Western1
- Blueberries -- Oregon, Western -- Growth1
- Blueberries -- Yields -- Oregon, Western1