- Herbicide-resistant crops -- Northwest, Pacific3
- Soft wheat -- Varieties -- Northwest, Pacific3
- Winter wheat -- Varieties -- Northwest, Pacific3
- Herbicides -- Application -- Northwest, Pacific2
- Soft wheat -- Disease and pest resistance -- Northwest, Pacific2
- Winter wheat -- Disease and pest resistance -- Northwest, Pacific2
- Equisetum -- Control -- Northwest, Pacific1
- Expert systems (Computer science)1
- Fertilizers -- Application -- Northwest, Pacific -- Data processing1
- Grapes -- Herbicide injuries -- Northwest, Pacific1
- Herbicides -- Northwest, Pacific1
- Herbicides -- Toxicology -- Northwest, Pacific1
- Irrigation -- Northwest, Pacific -- Management -- Data processing1
- Reforestation -- Northwest, Pacific1
- Soil ecology -- Northwest, Pacific1
- Soil invertebrates -- Effect of pesticides on -- Northwest, Pacific1
- Weeds -- Control -- Northwest, Pacific1
- Wheat -- Fertilizers -- Northwest, Pacific -- Data processing1
- Wheat -- Irrigation -- Northwest, Pacific -- Data processing1
- Winter wheat -- Weed control -- Northwest, Pacific1