Nitrogen-15 and bromide tracers of nitrogen fertilizer movement in irrigated wheat production

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Abstract

In irrigated agricultural systems, NO3 leaching is believed to result from high fertilizer rates combined with the need to periodically leach salts from surface soil horizons. The purpose of this research is to estimate N fertilizer movement in the soil of commercial fields of flood-irrigated wheat (Triticum spp.) while documenting best management practices (BMPs). Potassium bromide and 15N labeled ammonium sulfate were applied as tracers of N fertilizer movement to 1- x 1-m microplots replicated 9 or 10 times in three commercial fields of flood-irrigated wheat. The soil was sampled at harvest to a depth of 2.4 to 4.0 m. More fertilizer was applied at two out of thee sites and more irrigation water was applied at all sites than recommended by BMPs. Bromide recovery in the soil and plant tissue at harvest was 29, 68, and 61% of that applied at the three sites. Most of the 15N measured in the soil profile was contained in the 0- to 0.3-m increment of soil. Recovery on 15N in the soil and plant tissue at harvest was 54, 54, and 69% of that applied. The Br recovery data suggests that 32 ± 28% (standard deviation) of the 15N applied may have leached. The highest leaching potential was measured at the site that adhered to BMPs for N fertilizer management but had the most permeable soil. Nitrate leaching in flood-irrigated wheat production seemms inevitable even if BMPs for N fertilizer management are followed.

Original languageEnglish (US)
Pages (from-to)1500-1508
Number of pages9
JournalJournal of Environmental Quality
Volume29
Issue number5
StatePublished - Sep 2000

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Nitrogen fertilizers
nitrogen isotope
Bromides
bromide
Fertilizers
Nitrogen
wheat
tracer
best management practice
fertilizer
Soils
nitrogen
soil
leaching
Leaching
Recovery
ammonium sulfate
Tissue
soil horizon
farming system

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

Cite this

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title = "Nitrogen-15 and bromide tracers of nitrogen fertilizer movement in irrigated wheat production",
abstract = "In irrigated agricultural systems, NO3 leaching is believed to result from high fertilizer rates combined with the need to periodically leach salts from surface soil horizons. The purpose of this research is to estimate N fertilizer movement in the soil of commercial fields of flood-irrigated wheat (Triticum spp.) while documenting best management practices (BMPs). Potassium bromide and 15N labeled ammonium sulfate were applied as tracers of N fertilizer movement to 1- x 1-m microplots replicated 9 or 10 times in three commercial fields of flood-irrigated wheat. The soil was sampled at harvest to a depth of 2.4 to 4.0 m. More fertilizer was applied at two out of thee sites and more irrigation water was applied at all sites than recommended by BMPs. Bromide recovery in the soil and plant tissue at harvest was 29, 68, and 61{\%} of that applied at the three sites. Most of the 15N measured in the soil profile was contained in the 0- to 0.3-m increment of soil. Recovery on 15N in the soil and plant tissue at harvest was 54, 54, and 69{\%} of that applied. The Br recovery data suggests that 32 ± 28{\%} (standard deviation) of the 15N applied may have leached. The highest leaching potential was measured at the site that adhered to BMPs for N fertilizer management but had the most permeable soil. Nitrate leaching in flood-irrigated wheat production seemms inevitable even if BMPs for N fertilizer management are followed.",
author = "Ottman, {Michael J} and Tickes, {Barry R} and Husman, {Stephen H}",
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T1 - Nitrogen-15 and bromide tracers of nitrogen fertilizer movement in irrigated wheat production

AU - Ottman, Michael J

AU - Tickes, Barry R

AU - Husman, Stephen H

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N2 - In irrigated agricultural systems, NO3 leaching is believed to result from high fertilizer rates combined with the need to periodically leach salts from surface soil horizons. The purpose of this research is to estimate N fertilizer movement in the soil of commercial fields of flood-irrigated wheat (Triticum spp.) while documenting best management practices (BMPs). Potassium bromide and 15N labeled ammonium sulfate were applied as tracers of N fertilizer movement to 1- x 1-m microplots replicated 9 or 10 times in three commercial fields of flood-irrigated wheat. The soil was sampled at harvest to a depth of 2.4 to 4.0 m. More fertilizer was applied at two out of thee sites and more irrigation water was applied at all sites than recommended by BMPs. Bromide recovery in the soil and plant tissue at harvest was 29, 68, and 61% of that applied at the three sites. Most of the 15N measured in the soil profile was contained in the 0- to 0.3-m increment of soil. Recovery on 15N in the soil and plant tissue at harvest was 54, 54, and 69% of that applied. The Br recovery data suggests that 32 ± 28% (standard deviation) of the 15N applied may have leached. The highest leaching potential was measured at the site that adhered to BMPs for N fertilizer management but had the most permeable soil. Nitrate leaching in flood-irrigated wheat production seemms inevitable even if BMPs for N fertilizer management are followed.

AB - In irrigated agricultural systems, NO3 leaching is believed to result from high fertilizer rates combined with the need to periodically leach salts from surface soil horizons. The purpose of this research is to estimate N fertilizer movement in the soil of commercial fields of flood-irrigated wheat (Triticum spp.) while documenting best management practices (BMPs). Potassium bromide and 15N labeled ammonium sulfate were applied as tracers of N fertilizer movement to 1- x 1-m microplots replicated 9 or 10 times in three commercial fields of flood-irrigated wheat. The soil was sampled at harvest to a depth of 2.4 to 4.0 m. More fertilizer was applied at two out of thee sites and more irrigation water was applied at all sites than recommended by BMPs. Bromide recovery in the soil and plant tissue at harvest was 29, 68, and 61% of that applied at the three sites. Most of the 15N measured in the soil profile was contained in the 0- to 0.3-m increment of soil. Recovery on 15N in the soil and plant tissue at harvest was 54, 54, and 69% of that applied. The Br recovery data suggests that 32 ± 28% (standard deviation) of the 15N applied may have leached. The highest leaching potential was measured at the site that adhered to BMPs for N fertilizer management but had the most permeable soil. Nitrate leaching in flood-irrigated wheat production seemms inevitable even if BMPs for N fertilizer management are followed.

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