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Agronomic Evaluation of Anaerobic Digestion System Recovered Fertilizers

March 23, 2016 10am PDT. Webinar recording below.

Speaker: Dr. Harold P. Collins, Soil Scientist and Microbiologist at the Grassland, Soil and Water Research Laboratory, U.S. Department of Agriculture’s Agricultural Research Service, Temple, TX.

Webinar description: Increasing public concern about environmental quality and the sustainability of agro-ecosystems has emphasized the need to develop management strategies that protect soil and water resources. The recent use of anaerobic digesters (AD) on Pacific Northwest dairies to mitigate excessive manure storage and produce energy generates substantial amounts of nutrient-rich materials after digestion. Dr. Collins will share research that assesses new products derived from AD treatment of dairy and poultry wastes, with a particular emphasis on the dynamics, availability and uptake of phosphorous (P) from P-enriched materials recovered from anaerobic digesters. Dr. Collins will discuss the opportunities and challenges related to using animal wastes as fertilizers without the need for composting in the Pacific Northwest.

CollinsDr. Harold P. Collins’ current work is oriented towards developing new knowledge and technology for the USDA’s National Program of Agricultural System Competitiveness and Sustainability. His focus areas include soil microbial-mediated processes, plant-microbe interactions, and soil organic matter dynamics within natural and agroecosystems. Dr. Collins has collaborated with colleagues at the Center for Sustaining Agriculture and Natural Resources, Washington State University on a number of research projects related to biochar effects on soils, production of biomass and oilseed energy crops, effects of animal production on greenhouse gases released to the atmosphere, and utilization of animal wastes as fertilizers. His current research focuses on the environmental factors regulating carbon, nitrogen and phosphorus cycling and greenhouse gas emissions (carbon dioxide, nitrous oxide, methane) from native grasslands and crop and livestock systems.