Redox Potentials in a Cropped Potato Processing Waste Water Disposal Field with a Deep Water Table

Smith, J.H. and Gilbert, R.G. and Miller, J.B. (1978) Redox Potentials in a Cropped Potato Processing Waste Water Disposal Field with a Deep Water Table. Journal of Environment Quality. 7(4):571-574.

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Abstract

Redox potential measurements were made in a field irrigated with
potato processing waste water at seven depths of 5 to 150 cm for 14
mo. Irrigation with canal water mixed with waste water in the summer,
and with waste water in the winter, decreased redox potentials in
the field at some depths for a short time but not enough to cause denitrification.
However, as the soil temperature increased in the spring,
and decomposition of the accumulated waste organic matter accelerated,
redox potentials decreased after each irrigation at all observed
depths. During April, redox potentials low enough to promote denitrification
(below + 225 mV) at 90-, 120-, and 150-cm depths in the soil
persisted for 2 weeks. Irrigation with nondiluted waste water in June
and July decreased redox potentials and denitrification occurred for
up to 3 days after irrigations. As the soil temperature increased in the
spring, nitrification of accumulated organic matter increased son nitrates.
Waste water irrigations from April to July promoted denitrification,
removing most of the nitrate from the soil, and thereby decreasing
the potential for ground water pollution.

Item Type:	Article
NWISRL Publication Number:	0417
Subjects:	Irrigated crops > Potato Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:52
Last Modified:	31 Jan 2017 20:36
Item ID:	348
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/348