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Odour Emissions Following Application of Hog Slurry to Grassland

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  074098.(doi:10.13031/2013.23113)
Authors:   Manasah S Mkhabela, Robert Gordon, Ali Madani, Dave Burton
Keywords:   Livestock manure, manure spreading, odour emissions, hog slurry, micrometeorological techniques, theoretical profile shape method

Nuisance odours emanating from livestock operations are a major concern to the non-farming public. Several field experiments were conducted to evaluate the effect of management strategies and meteorological conditions on odour emissions from hog slurry applied to grass. Management strategies included slurry application rate, soil water status, slurry dilution with water and rainfall simulation shortly after field application. It was found that doubling (120,000 L ha-1) the application rate had no impact on odour emissions. Tripling (180,000 L ha-1) the application rate, however, increased emissions, relative to a conventional (60,000 L ha-1) application rate. Applying slurry to soil that received rainfall prior to application increased emissions in one of the experiments, compared to soil that did not receive water. On average, diluting slurry with water decreased emissions by only 11%. Meanwhile, rainfall immediately after application increased odour emissions by 17%. Odour fluxes increased with higher windspeed, net radiation and evapotranspiration. Odour emissions can therefore, be reduced by following proper application rates, but most importantly, by applying slurry during calm, cool days. However, such stable weather conditions may increase odour persistence due to lack of vertical mixing, reduced transfer rates and slow drying of the slurry.

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