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Pond pine (Pinus serotina)
14
Soils
14
Trees -- Fertilizers
14
Pitch pine
13
Phosphatic fertilizers
12
Forest thinning
11
Pine -- Seedlings
11
Conifers
10
Slash pine
10
Forest genetics -- Research
9
Logging
9
Oak
9
Pollination
9
Production engineering
9
Soils -- Phosphorus content
9
Yellow poplars (Liriodendron tulipifera)
9
Trees -- Hybridization
8
Water quality
8
Aerial spraying and dusting in forestry
7
Shortleaf pine (Pinus echinata)
7