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- Soil Modeling 1
- soil moisture 1
- Soil moisture -- Mathematical models 5
- soil organic matter 1
- soil P availavility 1
- soil productivity 1
- Soil properties 1
- soil quality 1
- Soil Science 11
- Soil science -- Oregon 1
- Soil solutions -- Mathematical models 5
- Soil survey 1
- Soil temperature 1
- Soil temperature -- Oregon -- Statistics 1
- Soil temperature -- Oregon -- Willamette Valley 1
- soil transport processes 1
- soil treatment 1
- Soil type 1
- Soil use 2
- Soil water conservation 1