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United States Department of Agriculture (USDA) 2006

FLOW OF NUTRIENTS IN SEMIARID ECOSYSTEMS FROM ANIMAL MANURE

Nutrients Animal Manure

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : FLOW OF NUTRIENTS IN SEMIARID ECOSYSTEMS FROM ANIMAL MANURE

Identification : OKL02595

Pays : Etats Unis

Durée : Jul 15, 2006 à Jul 14, 2009

Mots clés : swine effluent swine diet manipulation animal waste ecosystems ammonia emissions ammonia deposition reduced tillage decision support systems

Partenaire : OKLAHOMA STATE UNIVERSITY STILLWATER,OK 74078

Objectifs
1) Determine best management practices for animal waste utilization in long-term reduced tillage cropping systems ; 2) Determine gaseous emissions and deposition from animal waste ; 3) To assess the impact of animal waste and ammonia deposition on soil biology ; 4) Use diet modification to alter swine manure nutrient content and evaluate resulting changes in manure properties ; 5) Evaluate the economic impact of indoor air quality and diet modification for swine.

Descriptif
Swine effluent will be land applied by selected N rates to no-till corn-wheat and sorghum-wheat rotations to determine agronomic rates under irrigated corn. Subsurface irrigation will be used as a method to apply swine effluent to irrigated cropping systems. Measurements of biomass production, nutrient uptake, and nutrient changes in the soil profile will be collected. Wet and dry ammonia deposition will be assessed on sites near confined animal feeding operations and correlated to vegetative and microbial communities. Two approaches will be used to assess the impact of animal waste on the soil biological community. Microbial activity, diversity and community structure will be evaluated using culture techniques in combination with molecular technologies. Current microbial activity will be assessed by determining enzymatic activity of dehydrogenase. Additional work will be conducted to determine the effect of diet management on ammonia emissions from swine. These experiments will be performed in a research finisher where quantitative measurement of nitrogen, phosphorus, and salt inputs and outputs can be determined during the life-cycle for growing finishing pigs in a commercial setting. In addition the liberation of ammonia, methane, and carbon dioxide from the pits will be quantified. This information will be used to evaluate system level economics of dietary changes to reduce nitrogen and phosphorus excretion and those from air quality improvements within and around confined swine feeding facilities. It will be accomplished by econometric or statistical analysis of data from swine diet experiments conducted at Oklahoma State University. Budget and simulation methods will be used to estimate costs and returns associated with the amount and form of dietary nitrogen and phosphorus, the rate of and cost of gain and the costs associated with the quantity and form of nitrogen and phosphorous excretion.

Présentation : USDA

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