Impact of Poultry Manure Application on Phosphorus Loss with Surface Runoff and Tile Drainage. (S08-haq813613-poster)
Authors:
M.U. Haq - Iowa State University A.P. Mallarino - Iowa State University J.G. Klatt - Iowa State University J.C. Lorimor - Iowa State University R.S. Kanwar - Iowa State University C.H. Pedersen - Iowa State University B.L. Allen - Iowa State University
Abstract:
Continued N-based application of poultry manure for corn increases soil-test P (STP) and the risk of P loss to water bodies. This study investigated effects of poultry manure application on STP and P loss with surface runoff and tile drainage. Manure was broadcast and incorporated (within 24 h) before planting corn at 0, 168, and 336 kg N/ha during three corn-soybean rotation cycles. Dissolved reactive P (DRP) in subsurface tile drainage was measured weekly during 4 years, and surface runoff was measured in the spring of 2 years and the fall of one year with simulated rainfall (7.7 cm/h rain to 2 x 1.5 m plots, and 30 min collection). Total P (TP), FeO-impregnated paper P (BioP), and DRP in runoff were measured before manure application, within 24 h of application with or without incorporation, and after harvest. Runoff P across treatments and simulation dates ranged from 0-4.7, 0.02-20, and 0.2-89 mg/L DRP, BIOP, and TP. Manure incorporation reduced DRP, BioP, and TP concentrations 92, 95, and 89%. DRP and BioP increased linearly with soil P tested with seven agronomic and environmental tests for simulations conducted before manure application, but TP correlations were poor. Tile water DRP was very low (usually under 0.05 mg/L) unless Bray-1 or Mehlich-3 STP was over 80 mg/kg.
Controlling poultry manure rate and surface runoff are the major factors for reducing P loss.
Speaker Information: Mazhar Haq, Iowa State University, Department of AgronomyIowa State University, Ames, IA 50011; Phone: 515-294-6200; E-mail: [email protected]
Session Information: Wednesday, November 5, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 912)
Keywords: manure management; phosphorus losses; enviromental phosphorus testing; phosphorus management