Analytical methods Aquatic Biology and Ecology Aquatic environment Biochemistry and Physiology of Microorganisms, (New March 2000) Biological activity in soil Chemical speciation Chromatography Ecosystems Environmental aspects Hydrolysis Mass spectrometry Mathematics and Statistics Microbial activities Models Nuclear magnetic resonance spectroscopy Nutrient deficiencies Nutrient uptake Organophosphorus compounds Phosphorus Phosphorus content Plant Nutrition Plant nutrition Soil Biology Soil Chemistry and Mineralogy Soil Fertility Soil chemistry Soil enzymes Soil fertility Soil flora Soil organic matter