- Plant Sciences 8
- Agriculture 7
- Biochemistry, general 3
- Ecology 3
- Soil Science & Conservation 3
- Environment, general 2
- Forestry 2
- Tree Biology 2
- Antibodies 1
- Cell Biology 1
- Cell Culture 1
- Entomology 1
- Immunology 1
- Life Sciences, general 1
- Pathology 1
- Plant Anatomy/Development 1
- Plant Ecology 1
- Plant Pathology 1
- Plant Physiology 1
- Plant Systematics/Taxonomy/Biogeography 1