Aquatic plants 6 Aquatic organisms 4 Algae 3 Aquatic Biology and Ecology 3 Energy 3 Non-food/Non-feed Plant Products 3 Plants 3 more ... Pollution and Degradation 3 Biofuels 2 Energy crops 2 Plant Physiology and Biochemistry 2 Renewable energy 2 Renewable resources 2 Sustainability 2 Taxonomy 2 Weeds 2 Weeds and Noxious Plants 2 Agriculture and energy 1 Antagonists 1 Aquatic animals 1 Aquatic weeds 1 Aromatic hydrocarbons 1 Arthropod pests 1 Bacillariophyta 1 Bacteria 1 Biochemistry 1 Biochemistry and Physiology of Microorganisms, (New March 2000) 1 Biodegradation 1 Biodegradation, Environmental 1 Bioelectric Energy Sources 1 less ...