Field-scale evaluation of phosphorus leaching in acid sandy soils receiving swine waste

Nelson, N.O. and Parsons, J.E. and Mikkelsen, R.L. (2005) Field-scale evaluation of phosphorus leaching in acid sandy soils receiving swine waste. Journal of Environmental Quality. 34:2024-2035.

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Abstract

Accurate descriptions of P leaching are important because excess
P applied to soils can enter surface water via leaching and subsurface
transport, thereby negatively impacting water quality. The objectives
of this study were to monitor P leaching in soils with a long-term
history of waste application, relate soil solution P concentrations to
soil P status, and quantify P leaching losses. Soil solution was monitored
for 20 mo with samplers installed at 45-, 90-, and 135-cm depths
in two pits (1 X 3 X L5 m) in Autryville (loamy, siliceous, thermic
Arenic Paleudults) and Blanton (loamy, siliceous, semiactive, thermic
Grossarenic Paleudults) soils located in a grazed pasture in Sampson
County, NC, which had received swine waste for >20 yr. Maximum
soil solution P concentrations at 45 cm exceeded 18 mg L' in both
soils. Soil solution P concentrations at 90 cm in the Blanton soil were
similar to that at 45 cm indicating low P sorption. Soil solution P
concentrations at 90 cm in the Autryville soil averaged 0.05 mg L-'
compared to 10 mg L' at 45 cm. A split-line model related soil solution
P concentration to the degree of phosphorus saturation (DPS),
identifying a change point at 45% DPS. Phosphorus movement past
45 cm equaled or exceeded surplus P additions for both soils. Longterm
waste applications resulted in DPS > 90%, high soil solution
P concentrations, and substantial vertical P movement. Phosphorus
leaching should be considered when assessing long-term risk of P loss
from waste-amended soils.

Item Type:	Article
NWISRL Publication Number:	1171
Subjects:	Manure > Chemistry Soil > Chemistry > Phosphorous Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:49
Last Modified:	01 Nov 2016 15:59
Item ID:	23
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/23