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Boron contents and isotopic compositions of hog manure, selected fertilizers, and water in Minnesota

Journal of Environmental Quality

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DOI:10.2134/jeq1997.00472425002600050004x

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Abstract

Boron-isotope (δ11B) values may be useful as surrogate tracers of contaminants and indicators of water mixing in agricultural settings. This paper characterizes the B contents and isotopic compositions of hog manure and selected fertilizers, and presents δ11B data for ground and surface water from two agricultural areas. Boron concentrations in dry hog manure averaged 61 mg/kg and in commercial fertilizers ranged from below detection limits in some brands of ammonium nitrate and urea to 382 mg/kg in magnesium sulfate. Values of δ11B of untreated hog manure ranged from 7.2 to 11.2o/oo and of N fertilizers were −2.0 to 0.7o/oo. In 22 groundwater samples from a sand-plain aquifer in east-central Minnesota, B concentrations averaged 0.04 mg/L and δ11B values ranged from 2.3 to 41.5o/oo. Groundwater beneath a hog feedlot and a cultivated field where hog manure was applied had B-isotope compositions consistent with the water containing hog-manure leachate. In a 775-km2 watershed with silty-loam soils in southcentral Minnesota: 18 samples of subsurface drainage from corn (Zea mays L.) and soybean (Glycine max L. Merr.) fields had average B concentrations of 0.06 mg/L and δ11B values of 5.3 to 15.1o/oo; 27 stream samples had average B concentrations of 0.05 mg/L and δ11B values of 1.0 to 19.0o/oo; and eight groundwater samples had average B concentrations of 0.09 mg/L and δ11B values of −0.3 to 23.0o/oo. Values of δ11B and B concentrations, when plotted against one another, define a curved mixing trend that suggests subsurface drainage and stream water contain mixtures of B from shallow and deep groundwater.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Boron contents and isotopic compositions of hog manure, selected fertilizers, and water in Minnesota
Series title:
Journal of Environmental Quality
DOI:
10.2134/jeq1997.00472425002600050004x
Volume:
26
Issue:
5
Year Published:
1997
Language:
English
Publisher:
American Soc of Agronomy Inc
Publisher location:
Madison, WI, United States
Contributing office(s):
Minnesota Water Science Center
Description:
11 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Environmental Quality
First page:
1212
Last page:
1222
Country:
United States
State:
Minnesota
Online Only (Y/N):
N
Additional Online Files (Y/N):
N