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A new and innovative approach to Best Management Practices for fertilizer application known as 4R nutrient stewardship is available, to ensure the environmental, social, and economical sustainability of commercial crop production. This 3-page fact sheet focuses on the basic concepts of the 4R nutrient stewardship principles for commercial crop production. Written by Guodong Liu, Kelly Morgan, Yuncong Li, Lincoln Zotarelli, James DeValerio, and Qingren Wang, and published by the UF Department of Horticultural Sciences, July 2015.
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Federal Water Pollution Control Act (Clean Water Act). 2002. 33 U. S. C. § 1251 et seq. Accessed July 6, 2015. http://www.epw.senate.gov/water.pdf
Hochmuth, G., R. Mylavarapu, and E. Hanlon. 2014. The Four Rs of Fertilizer Management. SL411. Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/ss624. Accessed July 2, 2015. https://doi.org/10.32473/edis-ss624-2014
Mikkelsen, R. L. 2011. "The '4R' Nutrient Stewardship Framework for Horticulture." HortTechnology 21(6): 658-662. https://doi.org/10.21273/HORTTECH.21.6.658
U.S. Environmental Protection Agency (EPA). 2015a. "Summary of the Clean Water Act." Accessed July 6, 2015. http://www2.epa.gov/laws-regulations/summary-clean-water-act
EPA. 2015b. "Title 40, Subpart 122.2: Definitions" in Electronic Code of Federal Regulations. Washington, DC: U.S. Government Publishing Office. Accessed July 2, 2015. http://www.ecfr.gov/cgi-bin/text-idx?SID=9be8514046d3f051480db50d6c4f7548&mc=true&node=pt40.22.122&rgn=div5#se40.22.122_12