arsenic, selenium, phosphorus, phosphorous, contaminants, ferrous sulphate, perchlorate, oxalates, groundwater, dieldrin, chlordane, nitrites, sulphate, pollutants, tetrachlorethylene, chromium, chlorides, coliform bacteria, carbon tetrachloride, sulfate, toxins, prussic acid, chloramine, furan, effluent, pesticides, chemicals, toxaphene, carbon disulfide, alkalinity, phosphates, orthophosphate, turbidity, urate, sodium nitrate, heptachlor, sodium chloride, bromate, coumarin, mercury, fluoride, dioxane, hydrogen sulfide, chlorate, sodium, estrogens, phenolphthalein, radium, dioxin, hypochlorite, cyanides, enteric bacteria, thiocyanate, enterococcus, benzoates, ammonia, nutrients, nitroglycerin, methemoglobinemia, nitrogen, coliform, chlorine, iodide, oxalic acid, calcium bicarbonate, methylmercury, milligrams, calcium, salicylates, benzoic acid, vinyl chloride, salts, carcinogens, nitrification, potassium, saxitoxin, ppb, pentachlorophenol, polychlorinated, trichloroethane, concentrations, fluorocarbons, sulphite, methyl chloride, aquifer, phylloquinone, norvir, chlortetracycline, arsenate, thyroxin, substances, tyramine, polychlorinated biphenyl, biphenyl, calcium nitrate, uric acid, digoxin, bicarbonates, purines, tritium, organochlorine, sorbate, fluorides, sulphates, alkalies, oxides, sulfates, halides, hydroxides, peroxides, sulfides, sulphides, carbonates, fertilisers, hydrates, nitrite, indole, peroxy, ammonium, benzene, cellulose, chilean, cupric, cuprous, cystine, difficultly, ferric, ferrous, hexa, hydrazine, lac, lipoid, mannitol, meteoritic, methionine

agrobacterium, fertiliser, fertilizer, genus agrobacterium, nitrate bacterium, nitric bacteria, nitric bacterium, nitrification, nitrify, nitrobacteria, nitrobacterium, nitrogen cycle, plant food