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© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Atmospheric carbon dioxide concentrations [CO2] are increasing steadily. Some reports have shown that root growth in grain crops is mostly stimulated in the topsoil rather than evenly throughout the soil profile by e[CO2], which is not optimal for crops grown in semi-arid environments with strong reliance on stored water. An experiment was conducted during the 2014 and 2015 growing seasons with two lentil (Lens culinaris) genotypes grown under Free Air CO2 Enrichment (FACE) in which root growth was observed non-destructively with mini-rhizotrons approximately every 2–3 weeks. Root growth was not always statistically increased by e[CO2] and not consistently between depths and genotypes. In 2014, root growth in the top 15 cm of the soil profile (topsoil) was indeed increased by e[CO2], but increases at lower depths (30–45 cm) later in the season were greater than in the topsoil. In 2015, e[CO2] only increased root length in the topsoil for one genotype, potentially reflecting the lack of plant available soil water between 30–60 cm until recharged by irrigation during grain filling. Our limited data to compare responses to e[CO2] showed that root length increases in the topsoil were correlated with a lower yield response to e[CO2]. The increase in yield response was rather correlated with increases in root growth below 30 cm depth.

Details

Title
Does Elevated [CO2] Only Increase Root Growth in the Topsoil? A FACE Study with Lentil in a Semi-Arid Environment
Author
Bourgault, Maryse 1   VIAFID ORCID Logo  ; Tausz-Posch, Sabine 2 ; Greenwood, Mark 3   VIAFID ORCID Logo  ; Löw, Markus 4   VIAFID ORCID Logo  ; Henty, Samuel 5 ; Armstrong, Roger D 6 ; Garry L O’Leary 6 ; Fitzgerald, Glenn J 6   VIAFID ORCID Logo  ; Tausz, Michael 2 

 51 Campus Drive, College of Agriculture, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada; Northern Agricultural Research Center, Montana State University, 3710 Assinniboine Road, Havre, MT 59501, USA; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC 3363, Australia; [email protected] (M.L.); [email protected] (S.H.) 
 Department of Agriculture, Science and the Environment, CQ University Australia, 114-190 Yaamba Road, Norman Gardens, QLD 4701, Australia; [email protected] (S.T.-P.); [email protected] (M.T.) 
 Department of Mathematical Sciences, Montana State University, Bozeman, MT 59717, USA; [email protected] 
 Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC 3363, Australia; [email protected] (M.L.); [email protected] (S.H.) 
 Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC 3363, Australia; [email protected] (M.L.); [email protected] (S.H.); Agriculture Victoria, The University of Melbourne Campus, Parkville, VIC 3053, Australia 
 Agriculture Victoria, Grains Innovation Park, 110 Natimuk Road, Horsham, VIC 3401, Australia; [email protected] (R.D.A.); [email protected] (G.L.O.); [email protected] (G.J.F.) 
First page
612
Publication year
2021
Publication date
2021
Publisher
MDPI AG
e-ISSN
22237747
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2530142829
Copyright
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.