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Nitrogen
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26
Forestry laboratories
15
Loblolly pine (Pinus taeda)
10
Women in science
3
Agriculture -- Research
2
Greenhouses
2
Hardwoods
2
Pine
2
Contracts
1
Cottonwood
1
Flue-cured tobacco
1
Plantations
1
Plants
1
Seeds
1
Soils -- Phosphorus content
1
Weeds -- Control
1