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Pasture runoff water quality from application of inorganic and organic nitrogen sources



Pasture runoff water quality from application of inorganic and organic nitrogen sources



Journal of Environmental Quality 13(1): 122-126



Surface runoff water quality from a fescue pasture receiving surface application of organic wastes and commercial fertilizer was evaluated at Clemson University (Clemson, SC [South Carolina, USA]). Dairy manure, poultry manure and municipal sludge were the organic wastes used in this experiment. Ammonium nitrate was the commercial fertilizer. The organic wastes and commercial fertilizer were applied at the rate of 112 kg N/ha to 8 plots during 4 periods. Due to a dry year, runoff events were produced by irrigation. The runoff water was collected and samples were analyzed for pH, total P, total suspended solids, total Kjeldahl N, NH4-N, NO3-N and chemical O2 demand. The nutrient concentrations in surface runoff were more dependent on the number of rainfalls since application of the fertilizer than on the quantity of rainfall or runoff. The concentrations of potential pollutants from surface-applied organic wastes or commerical fertilizer were reduced by 80-55% after 2 runoff events. The NO3-N concentration in the surface runoff from the plots receiving the commercial fertilizer exceeded the permissible public water supply standard during the 1st runoff event. The overall nutrient loss in the runoff was minimal (< 4% of total Kjeldahl N and chemical O2 demand and < 2.5% of total P).

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Accession: 001231875

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