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Fertilizers
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127
Forestry laboratories
41
Loblolly pine (Pinus taeda)
29
Greenhouses
16
Agricultural machinery
12
Forests and forestry
11
Agriculture
9
Agronomy
7
Tobacco
7
Growth (Plants)
6
Hardwoods
6
Agriculture -- Research
5
Pine
5
Plants
5
Agricultural extension work
4
Cotton
4
Crop science
4
Agricultural engineering
3
Farm mechanization -- North Carolina
3
Plantations
3