Subject
- No-tillage -- Oregon, Eastern1
- No-tillage -- Washington (State), Eastern1
- Phosphatic fertilizers -- Oregon, Eastern1
- Phosphatic fertilizers -- Washington (State), Eastern1
- Tillage1
- Wheat -- Growth1
- Wheat -- Water requirements1
- Winter wheat -- Fertilizers -- Oregon, Eastern1
- Winter wheat -- Fertilizers -- Washington (State), Eastern1