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Leaching Potential of Phosphorus from Cattle Excreta Patches in the Central Highlands of Florida
Author(s) -
Woodard Kenneth R.,
Liu Kesi,
WhiteLeech U. Renee,
Sollenberger Lynn E.
Publication year - 2013
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2012.0348
Subject(s) - leaching (pedology) , environmental science , phosphorus , hydrology (agriculture) , environmental chemistry , environmental engineering , soil water , soil science , geology , chemistry , geotechnical engineering , organic chemistry
Research is limited for cow–calf operations as a potential nonpoint source of P within Florida's central highlands region (CHR). The study was conducted in a bahiagrass ( Paspalum notatum Flügge) pasture. The soil is an excessively drained ‘Candler’ sand. In dung‐designated plots, 2 kg of fresh cattle dung was deposited across the surface of a 15‐cm‐radius circular zone (Zone 1 [Z1]) centered within 3 × 3 m plots. In urine plots, 1 L of urine was deposited on Z1 and 1 L on Zone 2 (Z2), an area extending outward from Z1 to 30 cm from plot center. In dung and urine plots, Zone 3 (Z3) extended from Z2 to 45 cm from plot center and Zone 4 (Z4) from Z3 to 60 cm. Excreta deposition frequencies (DFs) were 0, 1, 2, and 3 times per year during 2006 and 2007. Total apparent remaining P (ARP = [fertilizer P + excreta P] − forage P removal) for Z1 of dung plots was 21, 447, 905, and 1249 kg ha −1 for DF0, DF1, DF2, and DF3, respectively. In 2008, soil was incrementally sampled to a depth of 120 cm in all zones. Urine deposition did not increase soil P. Soil P levels and the degree of P saturation percentages increased with DF but only in the upper 10 cm of topsoil beneath Z1 of dung plots. Our results suggest that the risk of dung P reaching groundwater is low due to a considerable P retention capacity within the rooting zone of the Candler soil.