Abstract
Enhancing root-zone (RZ) dissolved inorganic carbon (DIC) levels of plants grown hydroponically and aeroponically can increase biomass accumulation but may also alter plant nutrient uptake. These experiments investigated how bicarbonate (HCO3−) added to a hydroponic nutrient solution and CO2 gas added to an aeroponic system affected biomass and nutrient concentrations of lettuce and pepper plants. Applying high RZ HCO3− concentrations (20 mM) to lettuce plants grown hydroponically decreased foliar N, P, Cu, K, Mn and Zn concentrations, concurrent with decreased biomass accumulation (50% less than control plants). On the contrary, 1 mM RZ HCO3− promoted biomass accumulation (10% more than control plants), but this could not be attributed to higher tissue nutrient concentrations. While elevated RZ CO2 did not alter biomass accumulation and nutrient concentrations in pepper grown aeroponically, it decreased foliar Mg and S concentrations in lettuce grown aeroponically even though nutrient contents (concentration x biomass) did not differ between treatments, due to 22% more biomass than control plants. In addition, elevated RZ CO2 enhanced N, P, Cu and Zn contents relative to control plants, indicating greater uptake of those elements. Nevertheless, there was no consistent relationship between plant growth promotion and altered plant nutrition, suggesting alternative mechanisms of growth regulation.
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Claims 11
Claim · model-written summary
High bicarbonate decreased lettuce foliar N, P and Cu concentrations.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- high RZ HCO3− concentrations (20 mM)e0
- Outcome
- foliar N, P, Cue0
- Direction
- decreasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying high RZ HCO3− concentrations (20 mM) to lettuce plants grown hydroponically decreased foliar N, P, Cu, K, Mn and Zn concentrations, concurrent with decreased biomass accumulation (50% less than control plants).”
Claim · model-written summary
High bicarbonate decreased lettuce foliar K, Mn and Zn concentrations.
- Taxon
- lettuceLactuca sativae0
- Treatment
- high RZ HCO3− concentrations (20 mM)e0
- Outcome
- K, Mn and Zn concentrationse0
- Direction
- decreasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying high RZ HCO3− concentrations (20 mM) to lettuce plants grown hydroponically decreased foliar N, P, Cu, K, Mn and Zn concentrations, concurrent with decreased biomass accumulation (50% less than control plants).”
Claim · model-written summary
High bicarbonate reduced lettuce biomass by 50%.
- Taxon
- lettuceLactuca sativae0
- Treatment
- high RZ HCO3− concentrations (20 mM)e0
- Outcome
- biomass accumulatione0
- Direction
- decreasede0
- Value
- 50%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying high RZ HCO3− concentrations (20 mM) to lettuce plants grown hydroponically decreased foliar N, P, Cu, K, Mn and Zn concentrations, concurrent with decreased biomass accumulation (50% less than control plants).”
Claim · model-written summary
One millimolar bicarbonate increased lettuce biomass by 10%.
- Taxon
- lettuceLactuca sativat0
- Treatment
- 1 mM RZ HCO3−e0
- Outcome
- biomass accumulatione0
- Direction
- promotede0
- Value
- 10%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1 mM RZ HCO3− promoted biomass accumulation (10% more than control plants)”
t0“Lettuce”
Claim · model-written summary
One millimolar bicarbonate growth promotion could not be attributed to higher lettuce tissue nutrient concentrations.
- Taxon
- lettuceLactuca sativat0
- Treatment
- 1 mM RZ HCO3−e0
- Outcome
- tissue nutrient concentrationse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1 mM RZ HCO3− promoted biomass accumulation (10% more than control plants), but this could not be attributed to higher tissue nutrient concentrations.”
t0“Lettuce”
Claim · model-written summary
Elevated root-zone CO2 did not alter pepper biomass or nutrient concentrations.
- Taxon
- peppere0
- Treatment
- elevated RZ CO2e0
- Outcome
- biomass accumulation and nutrient concentrationse0
- Direction
- did not altere0
Not reportedComparator
Verbatim
e0“elevated RZ CO2 did not alter biomass accumulation and nutrient concentrations in pepper grown aeroponically”
Claim · model-written summary
Elevated root-zone CO2 decreased lettuce foliar Mg and S.
- Taxon
- lettuceLactuca sativae0
- Treatment
- elevated RZ CO2e0
- Outcome
- foliar Mg and S concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While elevated RZ CO2 did not alter biomass accumulation and nutrient concentrations in pepper grown aeroponically, it decreased foliar Mg and S concentrations in lettuce grown aeroponically”
Claim · model-written summary
Elevated root-zone CO2 increased lettuce biomass by 22%.
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to 22% more biomass than control plants”
t0“Lettuce”
Claim · model-written summary
Elevated root-zone CO2 did not change lettuce nutrient contents.
- Taxon
- lettuceLactuca sativat0
- Outcome
- nutrient contentse0
- Direction
- did not differe0
- Comparator
- treatmentse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrient contents (concentration x biomass) did not differ between treatments”
t0“Lettuce”
Claim · model-written summary
Elevated root-zone CO2 increased lettuce N, P and Cu contents.
- Taxon
- lettuceLactuca sativat0
- Treatment
- elevated RZ CO2e0
- Outcome
- N, P, Cue0
- Direction
- enhancede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated RZ CO2 enhanced N, P, Cu and Zn contents relative to control plants”
t0“Lettuce”
Claim · model-written summary
Elevated root-zone CO2 increased lettuce Zn content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- elevated RZ CO2e0
- Outcome
- Zn contentse0
- Direction
- enhancede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated RZ CO2 enhanced N, P, Cu and Zn contents relative to control plants”
t0“Lettuce”
The same questions in other papers
hydrogencarbonate · growth · Lactuca sativa (garden lettuce)Positive and negative results
1 in the opposite direction
- negative
co2 · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- negative
2 papers more in this group
See all 6 papers →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.