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Welcome to the Organic Horticulture page for the Dr. Kate Cassity-Duffey Laboratory. Dr. Cassity-Duffey is an Assistant Professor in the Department of Horticulture, specializing in organic production at UGA. Kate has conducted both field and laboratory research focused on nitrogen mineralization and volatilization from organic fertilizers and poultry liter. The Cassity-Duffey lab aims to to increase organic agricultural production and recognition in the state of Georgia and the Southeast by addressing regionally specific issues through a multidisciplinary approach to encourage profitable organic production. She provides significant outreach to farmers in Georgia and the Southeast as well as to UGA Extension educators. provides significant outreach to farmers in Georgia and the Southeast as well as to UGA Extension educators. 

Check out our online calculator that farmers can use to determine nitrogen availability for plants from applied organic fertilizers and poultry liter.