Subject
- Alfalfa -- Oregon -- Willamette River Valley -- Fertilizers1
- Fertilizers -- Application -- Oregon -- Willamette River Valley -- Methodology1
- Legumes -- Oregon -- Fertilizers1
- Legumes -- Yields -- Oregon1
- Lime -- Oregon -- Willamette River Valley1
- Liming of soils -- Oregon1
- Phosphatic fertilizers -- Oregon1
- Phosphatic fertilizers -- Oregon -- Willamette River Valley1
- Potatoes -- Oregon -- Willamette River Valley -- Fertilizers1
- Potatoes -- Oregon -- Willamette River Valley -- Quality1
- Potatoes -- Oregon -- Willamette River Valley -- Yields1