Subject
- Herbicides42
- Weeds -- Control42
- Pear21
- Strawberries20
- Herbicides -- Research17
- Weeds -- Control -- Research17
- Hazel11
- Apples10
- Beans10
- Boron8
- Lilies8
- Plants, Effect of nitrogen on8
- Companion planting6
- Douglas fir6
- Hazelnuts -- Disease and pest resistance -- Genetic aspects6
- Mulching6
- Pear -- Storage6
- Roots (Botany)6
- Sweet corn6
- Viticulture -- Oregon -- Willamette River Valley6