Subject
- Plants, Effect of soil moisture on11
- Liming of soils7
- Liming of soils -- Oregon6
- Liming of soils -- Oregon, Western5
- Soil temperature5
- Plants, Effect of soil compaction on4
- Forest soils3
- Plants, Effect of nitrogen on3
- Plants, Effect of temperature on3
- Shear strength of soils3
- Shear strength of soils -- Testing3
- Tillage3
- Boron2
- Burning of land2
- Compost2
- Forest soils -- Effect of logging on -- Northwest, Pacific2
- Growth (Plants)2
- Plants -- Effect of soil moisture on -- Oregon -- H.J. Andrews Experimental Forest2
- Plants, Effect of boron on2
- Plants, Effect of soil acidity on2