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Evapotranspiration partitioning and water use efficiency of switchgrass and biomass sorghum managed for biofuel

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  • Yimam, Yohannes Tadesse
  • Ochsner, Tyson E.
  • Kakani, Vijaya Gopal

Abstract

Switchgrass (Panicum virgatum L.) and biomass sorghum (Sorghum bicolor L. Moench) are two candidate bioenergy crops for the US Southern Great Plains region. In this water-limited region, there is a need to partition evapotranspiration (ET) and to determine the water use efficiency (WUE) of these potential feedstocks. Both crops were grown in a field plot experiment at Stillwater, OK. Soil water content measurements were made by neutron probe every two weeks to a depth of 2.0m in 0.2-m intervals over the course of three growing seasons. Growing season ET was estimated as the difference between growing season precipitation and change in root zone soil water storage. Evapotranspiration was partitioned by measuring canopy interception using interception trays and estimating soil evaporation using the FAO-56 dual crop coefficient method. Transpiration was calculated as ET minus soil evaporation and canopy interception. Transpiration was the largest component of ET; however, soil evaporation and canopy interception accounted for 28% of growing season ET for switchgrass and 42% for biomass sorghum. Although the non-productive losses were greater from biomass sorghum, WUE values of 9–49kgha−1mm−1 based on ET and 22–83kgha−1mm−1 based on transpiration were observed for biomass sorghum, which were greater than the WUE values of switchgrass, 8–21kgha−1mm−1 based on ET and 12–28kgha−1mm−1 based on transpiration. These results demonstrate that biomass sorghum is a candidate feedstock with potential to achieve greater WUE than switchgrass at this location; however, other factors such as economics and ecosystem services should also be considered.

Suggested Citation

  • Yimam, Yohannes Tadesse & Ochsner, Tyson E. & Kakani, Vijaya Gopal, 2015. "Evapotranspiration partitioning and water use efficiency of switchgrass and biomass sorghum managed for biofuel," Agricultural Water Management, Elsevier, vol. 155(C), pages 40-47.
    • Handle: RePEc:eee:agiwat:v:155:y:2015:i:c:p:40-47
    DOI: 10.1016/j.agwat.2015.03.018
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    References listed on IDEAS

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    1. Allen, Richard G., 2011. "Skin layer evaporation to account for small precipitation events—An enhancement to the FAO-56 evaporation model," Agricultural Water Management, Elsevier, vol. 99(1), pages 8-18.
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    2. Aydinsakir, Koksal & Buyuktas, Dursun & Dinç, Nazmi & Erdurmus, Cengiz & Bayram, Edip & Yegin, Arzu Bayir, 2021. "Yield and bioethanol productivity of sorghum under surface and subsurface drip irrigation," Agricultural Water Management, Elsevier, vol. 243(C).
    3. Rosa, Lorenzo & Sanchez, Daniel L. & Realmonte, Giulia & Baldocchi, Dennis & D'Odorico, Paolo, 2021. "The water footprint of carbon capture and storage technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    4. Michaela ŠKEŘÍKOVÁ & Václav BRANT & Milan KROULÍK & Jan PIVEC & Petr ZÁBRANSKÝ & Josef HAKL & Michael HOFBAUER, 2018. "Water demands and biomass production of sorghum and maize plants in areas with insufficient precipitation in Central Europe," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(8), pages 367-378.
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    6. Farajiamiri, Mina & Meyer, Jörn-Christian & Walther, Grit, 2023. "Multi-objective optimization of renewable fuel supply chains regarding cost, land use, and water use," Applied Energy, Elsevier, vol. 349(C).

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