Changes in Phosphorus Release Characteristics and Runoff Phosphorus for Soils Amended with Manure.
(S11-elrashidi239922-oral)
Authors:
M.A. Elrashidi* - USDA/NRCS-NSSC M.D. Mays - USDA/NRCS-NSSC T.C. Daniel - Univ. of Arkansas
Abstract:
The objectives of this study were to evaluate the effect of dairy manure application on: i) P released from surface soil by rainfall, ii) P removed from surface soil by runoff, and iii) soil P available for plants.
A technique implementing a Soil Survey laboratory method and USDA Runoff Model was applied on four Texas and three Utah soils. The application of manure (100 Mg/ha) considerably increased the amount of P released from surface soil by rainfall, but there was no significant change in the pattern of P release (phosphorus release characteristics). Manure application increased both the runoff-P, and available-P for plants. For the Blanket soil (Texas), P released from surface soil by rainfall increased from 1.01 to 29.5 kg/ha/yr. The runoff-P increased from 0.17 to 4.92 kg/ha/yr for fallow, 0.15 to 4.51 kg/ha/yr for cropland, and 0.13 to 3.70 kg/ha/yr for grassland. Soil P available for plants increased from 0.84, 0.86, and 0.88 to 24.5, 25.0, and 25.8 kg/ha/yr for fallow, cropland, and grassland,
respectively. Similar effects of manure application was noticed for other Texas and Utah soils. The data suggested that manure could provide substantial amounts of available P for crop production in these soils. However, irrigated cropland amended annually with manure could contribute to non-point source pollution of surface freshwater bodies. The applied technique can be used as a tool to quantify the impact on water resources.
Speaker Information: Moustafa Elrashidi, USDA/NRCS-NSSC, Federal Building, 100 Centennial Mall North, Lincoln, NE 68508-3866; Phone: (402)437-5319; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 12:55 PM-3:00 PM Presentation Start: 1:30 PM
Keywords: Anion Exchange Resin; Phosphorus Release Characteristics; Runoff Phosphorus; Manure Amended Soils
