Phosphorus losses in furrow irrigation runoff

Pérdidas de Fósforo en el Deslave de irrigación de Surco

Westermann, D.T. and Bjorneberg, D.L. and Aase, J.K. and Robbins, C.W. (2001) Phosphorus losses in furrow irrigation runoff. Journal of Environmental Quality. 30:1009-1015.

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Abstract

Phosphorus (P) often limits the eutrophication of streams, rivers,
and lakes receiving surface runoff. We evaluated the relationships
among selected soil P availability indices and runoff P fractions where
manure, whey, or commercial fertilizer applications had previously
established a range of soil P availabilities on a Portneuf silt loam
(coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid)
surface-irrigated with Snake River water. Water-soluble P, Olsen P
(inorganic and organic P), and iron-oxide impregnated paper-extractable
P (FeO-P,) were determined on a 0.03-m soil sample
taken from the bottom of each furrow before each irrigation in fall
1998 and spring 1999. Dissolved reactive phosphorus (DRP) in a 0.45-
µm filtered runoff sample, and iron-oxide impregnated paper-extractable
P (FeO-P„ ), total P, and sediment in an unfiltered runoff
sample were determined at selected intervals during a 4-h irrigation
on 18.3-m field plots. The 1998 and 1999 data sets were combined
because there were no significant differences. How-weighted average
runoff DRP and Fe0-P,, concentrations increased linearly as all three
soil P test concentrations increased. The average runoff total P concentration
was not related to any soil P test but was linearly related to
sediment concentration. Stepwise regression selected the independent
variables of sediment, soil lime concentration, and soil organic P
extracted by the Olsen method as related to average runoff total P
concentration. The average runoff total P concentration was 1.08 mg
L-1 at a soil Olsen P concentration of 10 mg kg-1. Soil erosion control
will be necessary to reduce P losses in surface irrigation runoff.

Item Type:	Article
NWISRL Publication Number:	1042
Subjects:	Irrigation > Furrow irrigation > Runoff losses > Nutrients Mass Import - autoclassified (may be erroneous)
Depositing User:	Users 6 not found.
Date Deposited:	20 Nov 2010 21:50
Last Modified:	14 Nov 2016 17:27
Item ID:	120
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/120