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Forestry laboratories
21
Loblolly pine (Pinus taeda)
16
Forests and forestry
7
Fertilizers
6
Nitrogen fertilizers
6
Greenhouses
5
Plantations
5
Nitrogen
4
Pine
3
Sweetgum
3
Seedlings
2
Trees -- Fertilizers
2
Drainage
1
Forest management
1
Herbicides
1
Irrigation
1
Oak
1
Phosphates
1
Soils -- Phosphorus content
1
Waste disposal
1