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.
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Claims 6
Claim · model-written summary
Elevated carbon dioxide did not consistently increase root growth across depths and genotypes.
- Taxon
- lentil (Lens culinaris)
Lens culinarise1 - Treatment
- e[CO2]e0
- Outcome
- Root growthe0
- Direction
- not always statistically increasede0
- Qualifier
- not consistently between depths and genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root growth was not always statistically increased by e[CO2] and not consistently between depths and genotypes.”
e1“two lentil (Lens culinaris) genotypes grown under Free Air CO2 Enrichment (FACE)”
Claim · model-written summary
In 2014 elevated carbon dioxide increased root growth in the top 15 cm.
- Taxon
- lentil (Lens culinaris)Lens culinarise1
- Organ / stage
- topsoile0
- Treatment
- e[CO2]e0
- Outcome
- root growthe0
- Direction
- increasede0
- Qualifier
- In 2014e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2014, root growth in the top 15 cm of the soil profile (topsoil) was indeed increased by e[CO2]”
e1“two lentil (Lens culinaris) genotypes”
Claim · model-written summary
In 2014 later season root growth increases at 30–45 cm exceeded those in topsoil.
- Taxon
- lentil (Lens culinaris)Lens culinarise1
- Treatment
- e[CO2]e2
- Outcome
- increases at lower depthse0
- Direction
- greater thane0
- Qualifier
- later in the seasone0
- Comparator
- topsoile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases at lower depths (30–45 cm) later in the season were greater than in the topsoil”
e1“two lentil (Lens culinaris) genotypes”
e2“was indeed increased by e[CO2]”
Claim · model-written summary
In 2015 elevated carbon dioxide increased topsoil root length for only one genotype.
- Taxon
- lentil (Lens culinaris)Lens culinarise1
- Organ / stage
- topsoile0
- Treatment
- e[CO2]e0
- Outcome
- root lengthe0
- Direction
- increasede0
- Qualifier
- for one genotypee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2015, e[CO2] only increased root length in the topsoil for one genotype”
e1“two lentil (Lens culinaris) genotypes”
Claim · model-written summary
Topsoil root length increases correlated with lower yield response to elevated carbon dioxide.
- Taxon
- lentil (Lens culinaris)Lens culinarise1
- Organ / stage
- root length increases in the topsoile0
- Outcome
- yield response to e[CO2]e0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root length increases in the topsoil were correlated with a lower yield response to e[CO2]”
e1“two lentil (Lens culinaris) genotypes”
Claim · model-written summary
Yield response increases correlated with increased root growth below 30 cm.
- Taxon
- lentil (Lens culinaris)Lens culinarise1
- Organ / stage
- root growth below 30 cm depthe0
- Outcome
- yield responsee0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in yield response was rather correlated with increases in root growth below 30 cm depth.”
e1“two lentil (Lens culinaris) genotypes”
The same questions in other papers
co2 · growth · Lens culinaris (lentil)Results agree
2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.