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Research ArticleResearch

Field evaluation of furrow irrigation performance, sediment loss, and bromide transport in a highly erosive silt loam soil

M. S. Ashraf, B. Izadi, B. A. King and H. Neibling
Journal of Soil and Water Conservation April 1999, 54 (2) 468-473;
M. S. Ashraf
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B. Izadi
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B. A. King
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H. Neibling
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ABSTRACT:

Bean farms in southern Idaho are largely surface irrigated, which adversely impact surface water quality due to improper design and management of the irrigation systems. The objectives of this study were to evaluate a farmer's irrigation system performance and recommend alternative irrigation management practices to improve its performance. Two sets of 14 furrows were located in a 4-ha bean field at steep slope (2.74%) and relatively mild slope (1.65%) sites for this study. To investigate two dimensional water and chemical transport, 200 kg ha−1 bromide (Br) of KBr was applied to 12 plots established within each site. Six furrow irrigations were monitored for inflows, outflows, and sediment losses. Straw was applied at the rate of 934 kg ha’ to approximately half of furrows after the third irrigation to study its effect on irrigation performance and soil erosion. The farmer's irrigation performance was poor with an estimated average application efficiency of 44% Numerical simulations showed that by selecting proper irrigation durations and inflow rates, average application efficiency can be increased to 58%. Slope had a significant effect on irrigation performance as runoff volume was 52% larger and sediment losses were eight times greater at the steep site under non-straw conditions. Application of straw mulch was effective in reducing sediment losses by 99 to 100%. Straw mulch was also effective in enhancing lateral transport of chemicals as was demonstrated by Br mass transport analysis.

Footnotes

  • M.S. Ashraf is a research scientist, and B. Izadi is a former associate professor for the Department of Biological and Agricultural Engineering, University of Idaho, Mascow, Idaho; B.A. King is associate professor, Department of Biological and Agricultural Engineering, University of Idaho Aberdeen Research and Extension Center, Aberdeen, Idaho; and H. Neibling is associate extension professor, Department of Biological and Agricultural Engineering, University of Idaho Twin Falls Research and Extension Center, Twin Falls, Idaho. Funding for this project was provided by a grant from STEEP II, U.S. Department of Agriculture Cooperative State Research, Education and Extension Service.

  • Copyright 1999 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 54 (2)
Journal of Soil and Water Conservation
Vol. 54, Issue 2
Second Quarter 1999
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Field evaluation of furrow irrigation performance, sediment loss, and bromide transport in a highly erosive silt loam soil
M. S. Ashraf, B. Izadi, B. A. King, H. Neibling
Journal of Soil and Water Conservation Apr 1999, 54 (2) 468-473;

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Field evaluation of furrow irrigation performance, sediment loss, and bromide transport in a highly erosive silt loam soil
M. S. Ashraf, B. Izadi, B. A. King, H. Neibling
Journal of Soil and Water Conservation Apr 1999, 54 (2) 468-473;
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