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. 2017 Jul 20;7:6092. doi: 10.1038/s41598-017-05530-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Seasonal trends of direct (●) and diffuse (○) photosynthetically active radiation (PAR) and air vapor pressure deficit (VPD); (b) inlet chamber air temperature (◻), outlet chambers air temperature for PS-SG (●), outlet chambers air temperature for Accession 72-096 (○ and ambient CO₂ concentration (▵) measured at the trial site. Values are daily means averaged from dawn to dusk.