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Title: SOIL BIOAVAILABLE P AFFECTS P IN SURFACE RUNOFF FROM FOUR SOILS AMENDED WITH POULTRY LITTER

Author
item TAPADAR, S - LOUISIANA STATE UNIV.
item Kovar, John
item DRAPCHO, C - LOUISIANA STATE UNIV.
item GASTON, L - LOUISIANA STATE UNIV.

Submitted to: Soil Science Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 11/9/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: For optimum utilization, poultry litter must be applied to soil in a manner than not only makes nutrients available to plants, but also minimizes nutrient losses to groundwater and surface water. In this study, soil P in the upper 15 cm of four Coastal Plain soils was determined and compared to total and dissolved P in surface runoff. Poultry litter had been surface applied to these course-textured soils each year, for up to 20 years. Available P (Bray 1, Bray 2, Mehlich 3), labile P (resin-exchangeable), and soil solution P were determined on samples collected from the 0-5 cm and 5-15 cm layers three times during a 2-year period. Surface runoff from simulated rainfall was collected at the time of soil sampling and analyzed for total and dissolved P. Soil P and organic matter content increased with increasing years of litter application. The increase was most evident in the surface layer; however, movement into the subsoil occurred after 12 years of litter application. Most P in the runoff was in the dissolved form. There was a general trend of increasing runoff P with increasing soil P, but even the most significant correlation was weak (r=0.38).