- Soil Science & Conservation 10
- Ecotoxicology 9
- Environment, general 8
- Environmental Chemistry 8
- Analytical Chemistry 6
- Environmental Physics 6
- Geochemistry 6
- Microbiology 6
- Agriculture 5
- Biotechnology 5
- Pollution, general 5
- Atmospheric Protection/Air Quality Control/Air Pollution 4
- Applied Microbiology 3
- Biochemistry, general 3
- Environmental Health 3
- Plant Sciences 3
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 3
- Ecology 2
- Environmental Engineering/Biotechnology 2
- Plant Physiology 2