Microbial populations 3 Microbial population 2 Actinomycetes 1 Algal blooms 1 Aquatic biota 1 Blue green algae 1 Ecosystems 1 Eutrophication 1 Food webs 1 Freshwater microbiology 1 Lakes 1 Lentic systems 1 Lotic systems 1 Microbial ecology 1 Microbial growth 1 Microbiology 1 Microorganisms 1 Mycorrhizal fungi 1 Oomycetes 1 Plant diseases-epidemiology phytopathogenic 1 Root morphology 1 Streams 1 Zooplankton 1 ecology of the soil population, the soil fauna other than protozoa, interactions between plant roots and micro-organisms, soil organic matter and its dynamics microbial transformations of nitrogen 1 microbial popullations 1 protozoa 1 soil condition & plant growth, mineral nutrition of crop plants, growth and functioning of plant roots, soil formation and characteristics of soil profiles, the inorganic components of the soil, surface chemistry of soil particles, 1 the temperature of the soil, the soil atmosphere, the behaviour of water in soil, water and crop growth, soil structure, tilth and mechanical behaviour, management of soil physical properties, the microbial population of the soil, 1 true fungi 1