Abstract
Abstract Changes in atmospheric CO2 have been shown to influence plant growth and maturity of many plants. A greenhouse experiment was conducted to determine the effects of enriched soil CO2 and moisture on Fe utilization and Fe deficiency chlorosis of grain sorghum (Sorghum bicolor L. Moench). Clareville cl (Pachic Argiustoll) was treated with 0, 2, and 4 mg Fe kg‐1 soil. Soil moisture regimes of 0.5 and 5.0 bars were compared at unaltered CO2 levels (control) and with CO2 injected into the potted soil periodically at measured intervals. Shoots and roots dry matter yields increased with increasing Fe rates and higher moisture content. However, soil CO2‐enrichment drastically depressed roots and shoots growth, dry matter yields and suppressed response to applied Fe. Overall analysis of variance for chlorosis and dry matter yields indicated that Fe explained most of the total variation in chlorosis ratings, while CO2 accounted for most of the total variation in dry matter yields. Iron uptakes were slightly lower, while P uptakes were drastically depressed with soil CO2‐enrichment. Tissue manganese concentrations were slightly lower, while Zn tissue contents were depressed as much as 60%. Tissue calcium contents were higher while Mg and K contents were lower with CO2‐enrichment. Soil DTPA extractable Fe at harvest was slightly lower with CO2‐enrichment, and generally ranged in the deficient category. Key words: Sorghum bicolor LFe‐EDDHAcalcareoustissue FeMnZnCuCaK and MgANOVAFe and P uptake
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Claims 13
Claim · model-written summary
Higher iron rates increased root and shoot dry matter yields.
- Taxon
- grain sorghum
Sorghum bicolort0 - Treatment
- increasing Fe ratese0
- Outcome
- Shoots and roots dry matter yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoots and roots dry matter yields increased with increasing Fe rates and higher moisture content”
t0“grain sorghum”
Claim · model-written summary
Higher moisture increased root and shoot dry matter yields.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- higher moisture contente0
- Outcome
- Shoots and roots dry matter yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoots and roots dry matter yields increased with increasing Fe rates and higher moisture content”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment depressed root and shoot growth and dry matter yields.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- soil CO2‐enrichmente0
- Outcome
- roots and shoots growth, dry matter yieldse0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil CO2‐enrichment drastically depressed roots and shoots growth, dry matter yields and suppressed response to applied Fe”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment suppressed growth response to applied iron.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- soil CO2‐enrichmente0
- Outcome
- response to applied Fee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil CO2‐enrichment drastically depressed roots and shoots growth, dry matter yields and suppressed response to applied Fe”
t0“grain sorghum”
Claim · model-written summary
Iron explained most variation in chlorosis ratings.
- Taxon
- grain sorghumSorghum bicolort0
- Compound
- Fee0
- Outcome
- variation in chlorosis ratingse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe explained most of the total variation in chlorosis ratings”
t0“grain sorghum”
Claim · model-written summary
Carbon dioxide explained most variation in dry matter yield.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2e0
- Outcome
- variation in dry matter yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 accounted for most of the total variation in dry matter yields”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment slightly lowered iron uptake.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- soil CO2‐enrichmente0
- Outcome
- Iron uptakese0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron uptakes were slightly lower, while P uptakes were drastically depressed with soil CO2‐enrichment”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment drastically depressed phosphorus uptake.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- soil CO2‐enrichmente0
- Outcome
- P uptakese0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron uptakes were slightly lower, while P uptakes were drastically depressed with soil CO2‐enrichment”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment slightly lowered tissue manganese concentration.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2‐enrichmentt1
- Outcome
- Tissue manganese concentrationse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue manganese concentrations were slightly lower, while Zn tissue contents were depressed as much as 60%”
t0“grain sorghum”
t1“were lower with CO2‐enrichment”
Claim · model-written summary
Soil carbon dioxide enrichment depressed tissue zinc content by as much as 60%.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2‐enrichmentt1
- Outcome
- Zn tissue contentse0
- Direction
- depressede0
- Value
- 60%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn tissue contents were depressed as much as 60%”
t0“grain sorghum”
t1“were lower with CO2‐enrichment”
Claim · model-written summary
Soil carbon dioxide enrichment raised tissue calcium content.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2‐enrichmente0
- Outcome
- Tissue calcium contentse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue calcium contents were higher while Mg and K contents were lower with CO2‐enrichment”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment lowered magnesium and potassium contents.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2‐enrichmente0
- Outcome
- Mg and K contentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue calcium contents were higher while Mg and K contents were lower with CO2‐enrichment”
t0“grain sorghum”
Claim · model-written summary
Soil carbon dioxide enrichment slightly lowered soil DTPA extractable iron at harvest.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- CO2‐enrichmente0
- Outcome
- Soil DTPA extractable Fe at harveste0
- Direction
- lowere0
- Qualifier
- deficient categorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil DTPA extractable Fe at harvest was slightly lower with CO2‐enrichment, and generally ranged in the deficient category”
t0“grain sorghum”
The same questions in other papers
iron atom · yield · Sorghum bicolor (sorghum)Positive and negative results
7 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
5 papers more in this group
See all 9 papers →co2 · yield · Sorghum bicolor (sorghum)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
soil water · yield · Sorghum bicolor (sorghum)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
co2 · nutrient: content · Sorghum bicolor (sorghum)Results agree
1 paper in the same direction as this paper
- no effect
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.