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College teachers
4
Nitrogen fertilizers
4
Plants -- Research
4
Sweetgum
4
Algae
3
Nematodes
3
Peanuts -- Research
3
Pine -- Seedlings
3
Agricultural engineering
2
Agricultural experiment stations
2
Agricultural extension work
2
Agriculture -- Research
2
Buildings
2
Crop science
2
Fires
2
Nitrogen
2
People associated with agriculture
2
Phosphatic fertilizers
2
Plants -- Effect of phosphorus on
2
Poinsettias
2