Subject
- Porous materials4
- Soil matric potential3
- Soil moisture -- Measurement3
- Agricultural pollution2
- Central Oregon Agricultural Research Center -- Periodicals2
- Clay soils2
- Groundwater -- Pollution2
- Groundwater flow2
- Humus2
- Nitrates -- Environmental aspects2
- Plant-water relationships2
- Runoff2
- Soil moisture2
- Subsurface drainage2
- Zone of aeration2
- Aggregation (Chemistry)1
- Agricultural chemicals -- Environmental aspects1
- Agricultural chemicals -- Environmental aspects -- Oregon -- Lane County1
- Agricultural pollution -- Oregon1
- Agricultural wastes -- Environmental aspects1