- Winter wheat -- Fertilizers -- Oregon5
- Arid regions agriculture -- Oregon1
- Arid regions agriculture -- Oregon, Eastern1
- Cropping systems -- Oregon, Eastern1
- Crops -- Water requirements -- Oregon, Eastern1
- Grain -- Fertilizers -- Oregon1
- Nitrogen fertilizers -- Oregon, Eastern1
- No-tillage -- Northwest, Pacific1
- No-tillage -- Oregon, Eastern1
- No-tillage -- Washington (State), Eastern1
- Phosphatic fertilizers -- Oregon, Eastern1
- Phosphatic fertilizers -- Washington (State), Eastern1
- Soft wheat -- Irrigation -- Oregon, Eastern1
- Soil moisture potential -- Oregon, Eastern1
- Wheat -- Fertilizers -- Oregon, Eastern1
- Winter wheat -- Fertilizers -- Oregon, Eastern1
- Winter wheat -- Fertilizers -- Washington (State), Eastern1
- Winter wheat -- Northwest, Pacific1