Composition, potential emissions and agricultural value of pig slurry from Spanish commercial farms

摘要: Pig slurry is a valuable fertilizer for crop production but at the same time its management may pose environmental risks. Slurry samples were collected from 77 commercial farms of four animal categories (gestating and lactating sows, nursery piglets growing pigs) analyzed macronutrients, micronutrients, heavy metals volatile fatty acids. Emissions ammonia (NH3) biochemical methane potential (BMP) quantified. electrical conductivity, pH, dry matter content ash also determined. Data analysis included an correlations among variables, development prediction models gaseous emissions nutritional slurries production. Descriptive information provided in this work shows wide range variability all studied variables. Animal category affected some physicochemical parameters, probably as consequence different use cleaning water. Slurries gestating sows pigs tended to be more concentrated nutrients, whereas diluted. Relevant relationships found characteristics expressed fresh basis gas emissions. Predictive using on-farm measurable parameters obtained NH3 (R2 = 0.51) CH4 (R2 = 0.76), which suggests that BMP estimated easily determined characteristics. Finally, nutrient composition was highly variable. Therefore, complete analyses should performed effective friendly land application.