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Research ArticleResearch Section

Soil profile sulfate in irrigated southern high plains cotton fields and Ogallala groundwater

A. Malapati, K.F. Bronson, J.D. Booker, W.H. Hudnall and A.M. Schubert
Journal of Soil and Water Conservation September 2011, 66 (5) 287-294; DOI: https://doi.org/10.2489/jswc.66.5.287
A. Malapati
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K.F. Bronson
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J.D. Booker
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W.H. Hudnall
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A.M. Schubert
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Abstract

Sulfate (SO4) is one of the most important anions in soils and groundwater in semiarid regions, including west Texas. Crops' sulfur (S) requirement is about 10% to 20% of the nitrogen requirements. However, there is far less information on soil test SO4-S (S in the SO4 form [sulfate-S]) for the western United States, compared to the humid eastern United States. The deposition of S from the atmosphere has declined nationwide, as coal-fired power plants have been scrubbing their emissions of S. This, combined with greater cotton yields and the lack of S fertilization on the Texas Southern High Plains (SHP) point to the need for a soil profile SO4-S assessment. The first objective of this study was to assess residual soil profile SO4-S content in irrigated cotton (Gossypium hirsutum) fields across a range of soil types and counties of the Texas SHP. The second objective was to compile regional SO4-S concentration data from the Texas Water Development Board irrigation well water quality database and analyze Ogallala groundwater SO4-S levels by county, soil map unit, and well depth. Soil profile (0 to 0.9 m [0 to 36 in]) SO4-S content ranged from 120 to 475 kg ha−1 (107 to 424 lb ac−1) among seven center-pivot fields sampled. About half of this S was in the 0.6 to 0.9 m (24 to 36 in) soil layer, which typically was sandy clay loam or clay loam in texture. Well water SO4-S concentration ranged from 9 to 220 mg L−1 (ppm) in clayey soils with deep groundwater to sandy soils with shallow groundwater, respectively. Groundwater SO4-S concentration was greater than the USEPA drinking water standard of 83 mg L−1 in 32% of the wells, especially in the southeastern corner of the study area. There was no consistent relationship between soil map unit and SO4-S content in the soil profile (0 to 0.9 m). A significant negative relationship between well depth and well water SO4-S concentration was observed in all the eleven-county study area of the SHP of West Texas. In conclusion, soil profile SO4 content to 0.9 m is high in SHP irrigated cotton fields and in most cases should be adequate for crop S nutritional requirements.

  • © 2011 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 66 (5)
Journal of Soil and Water Conservation
Vol. 66, Issue 5
September/October 2011
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Soil profile sulfate in irrigated southern high plains cotton fields and Ogallala groundwater
A. Malapati, K.F. Bronson, J.D. Booker, W.H. Hudnall, A.M. Schubert
Journal of Soil and Water Conservation Sep 2011, 66 (5) 287-294; DOI: 10.2489/jswc.66.5.287

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Soil profile sulfate in irrigated southern high plains cotton fields and Ogallala groundwater
A. Malapati, K.F. Bronson, J.D. Booker, W.H. Hudnall, A.M. Schubert
Journal of Soil and Water Conservation Sep 2011, 66 (5) 287-294; DOI: 10.2489/jswc.66.5.287
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