TY - JOUR
T1 - Interrelationships between water use efficiency and light use efficiency in four row crop canopies
AU - Kukal, Meetpal S.
AU - Irmak, Suat
N1 - Funding Information:
The work in this article was included as part of the first author's (M.S. Kukal) Ph.D. study while he was a graduate student in the Irmak Research Laboratory at the University of Nebraska‐Lincoln under the supervision of Suat Irmak (Harold W. Eberhard Distinguished Professor). This research is partially based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, Suat Irmak's Hatch Project, under the Project Number NEB‐21‐155. The trade names or commercial products are provided solely for the information of the reader and do not constitute a recommendation for use by the authors or their institutions.
Funding Information:
The work in this article was included as part of the first author's (M.S. Kukal) Ph.D. study while he was a graduate student in the Irmak Research Laboratory at the University of Nebraska-Lincoln under the supervision of Suat Irmak (Harold W. Eberhard Distinguished Professor). This research is partially based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, Suat Irmak's Hatch Project, under the Project Number NEB-21-155. The trade names or commercial products are provided solely for the information of the reader and do not constitute a recommendation for use by the authors or their?institutions.
Publisher Copyright:
© 2020 The Authors. Agrosystems, Geosciences & Environment published by Wiley Periodicals LLC on behalf of Crop Science Society of America and American Society of Agronomy
PY - 2020
Y1 - 2020
N2 - Quantitative evidence of light use efficiency (LUE) controls on water use efficiency (WUE) is lacking, especially comparatively across row crops. Field research experiments (2016–2018) were set up for maize (Zea mays L.), soybean [Glycine max (L.) Merr.], sorghum [Sorghum bicolor (L.) Moench], and winter wheat (Triticum aestivum L.), under optimal growth conditions in dry sub-humid conditions. Overall, LUE was able to explain 52% of variance in WUE, and were related as WUE = 1.73 LUE, although crop-specific variation was observed. Highest sensitivity of WUE to changes in LUE was found in sorghum, followed by soybean, winter wheat, and maize. Evapotranspiration per unit light absorbed by crop canopy, which is a measure of canopy conductance (gc) ranged from a minimum of 0.45 kg H2O MJ−1 in sorghum to a maximum of 0.68 kg H2O MJ−1 in maize. Slopes of WUE vs. LUE relationship were limited by energy-limited upper ceiling of latent heat of vaporization and characterized distribution of absorbed energy into latent heat of vaporization and sensible heat. Vapor pressure deficit (VPD) accounted for 41% of variability in the WUE vs. LUE relationship, and the relationship was subject to change with VPD conditions higher or lower than 0.85 kPa. Seasonal evolution of crop-specific gc was modeled and communicated as a function of heat accumulation during the growing season. The research findings contribute to quantification of critical parameters that bridge water and light use efficiency, and better understanding of the resource use in C3 and C4 agricultural row crops.
AB - Quantitative evidence of light use efficiency (LUE) controls on water use efficiency (WUE) is lacking, especially comparatively across row crops. Field research experiments (2016–2018) were set up for maize (Zea mays L.), soybean [Glycine max (L.) Merr.], sorghum [Sorghum bicolor (L.) Moench], and winter wheat (Triticum aestivum L.), under optimal growth conditions in dry sub-humid conditions. Overall, LUE was able to explain 52% of variance in WUE, and were related as WUE = 1.73 LUE, although crop-specific variation was observed. Highest sensitivity of WUE to changes in LUE was found in sorghum, followed by soybean, winter wheat, and maize. Evapotranspiration per unit light absorbed by crop canopy, which is a measure of canopy conductance (gc) ranged from a minimum of 0.45 kg H2O MJ−1 in sorghum to a maximum of 0.68 kg H2O MJ−1 in maize. Slopes of WUE vs. LUE relationship were limited by energy-limited upper ceiling of latent heat of vaporization and characterized distribution of absorbed energy into latent heat of vaporization and sensible heat. Vapor pressure deficit (VPD) accounted for 41% of variability in the WUE vs. LUE relationship, and the relationship was subject to change with VPD conditions higher or lower than 0.85 kPa. Seasonal evolution of crop-specific gc was modeled and communicated as a function of heat accumulation during the growing season. The research findings contribute to quantification of critical parameters that bridge water and light use efficiency, and better understanding of the resource use in C3 and C4 agricultural row crops.
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U2 - 10.1002/agg2.20110
DO - 10.1002/agg2.20110
M3 - Article
AN - SCOPUS:85111932468
SN - 2639-6696
VL - 3
JO - Agrosystems, Geosciences and Environment
JF - Agrosystems, Geosciences and Environment
IS - 1
M1 - e20110
ER -