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fate in soil classification root interception mass flow deficiency and toxicity symptoms functions essential nutrients criterion law of minimum p-fertilizers p transformations in soil phosphorus pesticide cycle pesticide pollution water pollution eutrophication cod bod soil and water pollution n-fertilizers nitrogen transformations in soil essential nutrients criterion of nutrients soil fertility irrigation water quality saline alkaline and sodic soils and their manageme saline soil profile and physical properties acid rain fluoride pollution oil spills fertilizer induced pollution phytoextraction phytoremediation bioremediation dap single super phosphate phosphatic fertilizers manufacturing nitrogen fertilizers dhaincha earthworms vermicomposting green manure decomposition composting methods nadep fym manures compost soil nutrient availability factors diffusion colloids