Livestock manure is a valuable nutrient source for crop production and soil conditioning. Long-term manure additions affect the total pool of soil organic matter and nutrient supply, which depends upon the mineralization rate. There are also effects on soil physical, chemical and biological properties. Dr. Robinson will discuss the nature of these long-term effects.
However, land application of livestock manures without prior treatment and/or in areas with intensive animal production may be a route of plant, soil or water contamination with manure-associated bacteria. Dr. Cook will provide an overview of the state-of the science and future directions (research and policy) with regards to pathogens and antibiotic resistance associated with agro-ecosystems, and discuss research conducted to characterize how naturally occurring populations of pathogens, fecal indicator bacteria (FIB) and bacteria with antibiotic resistance genes (ARG) respond in soils with applied manures. Results and implications for land and manure management will be discussed.
CCA/CPAg: 1.0 Soil and Water Management
CPSS/CPSC: 1.0 Professional Meetings
Kimberly Cook, PhD
Dr. Kimberly Cook is a research microbiologist that has been with the USDA ARS since 2003. She conducts applied, interdisciplinary research on the microbiology of animal wastes; evaluating microbiological and ecological processes responsible for the survival and spread of pathogens and antibiotic resistant bacteria through plant, soil and water agro-ecosystems. She obtained her PhD in Microbiology from the University of Tennessee.
Clay Robinson, PhD, CPSS, PG
Clay Robinson earned BS and MS degrees from West Texas State University, with a concentration in plant science/agronomy, and a PhD in Soil Management from Iowa State University. He is a Certified Professional Soil Scientist and former professor who taught soil science and agronomy courses at two universities from 1992 to 2011. He is published on the beneficial use of manure as a by-product, and on the capacity of three counties in the Texas High Plains to utilize for crop production all the nitrogen and phosphorus excreted in manure by the approximately 2 million feeder cattle. He supervised graduate students in research addressing the chemical and physical properties of soil and effects on crop yields after long-term applications of manure and effluent. He also worked with a CCA to evaluate field records of several producers of N from soil nitrate tests, stalk nitrate tests, and N fertilizer and manure applications on crop yields.
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August 27, 2015