Abstract
Elevated levels of arsenic (As) often found in soils used for cotton (Gossypium hirsutum L.) production may limit growth and yield of canola (Brassica napusL.). This study was conducted to i) determine how soil-applied As affected the shoot and root dry weights, root length density, As uptake and tissue concentration, and total water use of canola and ii) evaluate the influence of soil As on phosphorus (P) uptake by and tissue concentration of canola seedlings. An experiment was conducted in a controlled-climate chamber using three soils with histories of cotton production (Commerce silt loam, Rilla silt loam, and Sterlington silt loam) and three As application rates (0, 5, and 10 mg kg−1). Four 14-day-old canola seedlings were planted three in soils with histories of cotton production (Commerce silt loam, Rilla silt loam, and Sterlington silt loam) and three As application rates (0, 5, and 10 mg kg−1). Four 14-day-old canola seedlings were planted in 3-L pots containing 2.5 kg (oven-dry-weight basis) of each soil. After 14 days, whole plants were harvested. Shoot and root tissues were dried and analyzed for As and P. Arsenic uptake by seedlings grown in both the Commerce and Sterlington soils increased when 5 mg kg−1 As were added, but did not increase with further As addition. In the Rilla soil, As uptake did not change with As addition, possibly due to the lack of change in soil solution As with As addition. Arsenic tended to remain in the roots, rather than being translocated to the shoots. Arsenic addition had no effect on shoot and root dry weights, root length density, or total plant water use in any of the soils; however, As toxicity symptoms were evident on leaves of plants in all treatments where As had been applied. Phosphorus uptake by the canola seedlings tended to decrease as soil As increased, but P concentration in tissue was not affected. A decrease in shoot P: As ratios in plants grownin Commerce and Sterlington soils indicated competition between these ions. Results of this study suggest that canola could be adversely affected if grown on soils with a fresh As application.
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Claims 10
Claim · model-written summary
At 5 mg kg−1, arsenic uptake increased in Commerce and Sterlington soils, with no further increase at higher application.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- 5 mg kg−1 Ase0
- Outcome
- Arsenic uptakee0
- Direction
- increasede0
- Setting
- Commerce and Sterlington soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Arsenic uptake by seedlings grown in both the Commerce and Sterlington soils increased when 5 mg kg−1 As were added, but did not increase with further As addition”
t0“CANOLA”
Claim · model-written summary
Added arsenic did not change arsenic uptake in Rilla soil.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- As additione0
- Outcome
- As uptakee0
- Direction
- did not changee0
- Setting
- Rilla soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the Rilla soil, As uptake did not change with As addition”
t0“CANOLA”
Claim · model-written summary
Arsenic remained mainly in roots rather than moving to shoots.
- Taxon
- canolaBrassica napus var. napust0
- Organ / stage
- rootse0
- Outcome
- Arsenic tended to remain in the rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arsenic tended to remain in the roots, rather than being translocated to the shoots”
t0“CANOLA”
Claim · model-written summary
Arsenic addition did not affect shoot and root dry weights, root length density or water use in any soil.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Arsenic additione0
- Outcome
- shoot and root dry weights, root length density, or total plant water usee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arsenic addition had no effect on shoot and root dry weights, root length density, or total plant water use in any of the soils”
t0“CANOLA”
Claim · model-written summary
Arsenic toxicity symptoms appeared on leaves in all arsenic treatments.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- As had been appliede0
- Outcome
- As toxicity symptoms were evident on leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As toxicity symptoms were evident on leaves of plants in all treatments where As had been applied”
t0“CANOLA”
Claim · model-written summary
Canola phosphorus uptake tended to decrease as soil arsenic increased.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- soil Ase0
- Outcome
- Phosphorus uptakee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake by the canola seedlings tended to decrease as soil As increased”
Claim · model-written summary
Soil arsenic did not affect phosphorus concentration in tissue.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- soil Ase1
- Outcome
- P concentration in tissuee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P concentration in tissue was not affected”
e1“soil As increased”
t0“CANOLA”
Claim · model-written summary
Shoot P:As ratios decreased in Commerce and Sterlington soils.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- shoot P: As ratiose0
- Direction
- decreasee0
- Setting
- Commerce and Sterlington soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in shoot P: As ratios in plants grownin Commerce and Sterlington soils indicated competition between these ions”
t0“CANOLA”
Claim · model-written summary
The decreased shoot P:As ratio indicated competition between phosphorus and arsenic.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- competition between these ionse0
- Qualifier
- decrease in shoot P: As ratiose0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in shoot P: As ratios in plants grownin Commerce and Sterlington soils indicated competition between these ions”
t0“CANOLA”
Claim · model-written summary
Fresh arsenic application could adversely affect canola.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- fresh As applicatione0
- Outcome
- adversely affectede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola could be adversely affected if grown on soils with a fresh As application”
The same questions in other papers
arsenic atom · nutrient: content · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- negative
arsenic atom · crop injury · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- negative
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.