Abstract
Abstract Heavy metals in waste materials added to agricultural soils can severely inhibit subsequent crop growth. This study was conducted to evaluate the variation in tolerance among cultivars of an agriculturally important plant species to phytotoxic levels of added soil Zn. Twenty soybean ( Glycine max L. Merr.) cultivars were screened, through greenhouse pot studies, for their growth response to Zn at pH 5.5 and 6.5 on a Sassafras sandy loam (Fragiudult) amended with 1.31 (control), 131, and 262 ppm Zn. Significant differential responses were found, and the cultivars were grouped into several tolerance and uptake classes, based on the results of the pH 6.5, 262‐ppm Zn treatment: tolerant (9 to 18% leaf dry weight yield reduction [YR], 5 cultivars), normal (20 to 32% YR, 12 cultivars), sensitive (33 to 48% YR, 3 cultivars); accumulator (696 to 730 ppm trifoliolate leaf Zn, 5 cultivars), normal (549 to 675 ppm Zn, 11 cultivars), and excluder (389 to 540 ppm Zn, 4 cultivars). Soil Zn additions significantly increased root and foliar Mn contents to reported phytotoxic levels at both pH 5.5 and 6.5, but did not influence DTPA‐TEA extractable soil Mn. Significant cultivar differences in root and leaf Mn contents were observed. The results of this work illustrate the importance of cultivar selection, not only for field planting of Zn‐enriched soils, but also for its influence on experimental results.
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Claims 10
Claim · model-written summary
Soybean cultivars differed significantly in growth responses to Zn.
- Taxon
- soybean
Glycine maxe1 - Outcome
- differential responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differential responses were found”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars were screened”
Claim · model-written summary
Five tolerant cultivars had 9 to 18% leaf dry weight yield reduction at pH 6.5 and 262 ppm Zn.
- Taxon
- soybeanGlycine maxe2
- Material
- tolerante0
- Treatment
- 262‐ppm Zne1
- Outcome
- leaf dry weight yield reductione0
- Value
- 9 to 18%e0
- Qualifier
- pH 6.5e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerant (9 to 18% leaf dry weight yield reduction [YR], 5 cultivars)”
e1“pH 6.5, 262‐ppm Zn treatment”
e2“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Twelve normal cultivars had 20 to 32% leaf dry weight yield reduction.
- Taxon
- soybeanGlycine maxe2
- Material
- normale0
- Outcome
- leaf dry weight yield reductione1
- Value
- 20 to 32%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“normal (20 to 32% YR, 12 cultivars)”
e1“leaf dry weight yield reduction [YR]”
e2“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Three sensitive cultivars had 33 to 48% leaf dry weight yield reduction.
- Taxon
- soybeanGlycine maxe2
- Material
- sensitivee0
- Outcome
- leaf dry weight yield reductione1
- Value
- 33 to 48%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sensitive (33 to 48% YR, 3 cultivars)”
e1“leaf dry weight yield reduction [YR]”
e2“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Five accumulator cultivars had 696 to 730 ppm trifoliolate leaf Zn.
- Taxon
- soybeanGlycine maxe1
- Material
- accumulatore0
- Outcome
- trifoliolate leaf Zne0
- Value
- 696 to 730 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulator (696 to 730 ppm trifoliolate leaf Zn, 5 cultivars)”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Eleven normal cultivars had 549 to 675 ppm Zn.
- Taxon
- soybeanGlycine maxe1
- Material
- normale0
- Outcome
- Zne0
- Value
- 549 to 675 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“normal (549 to 675 ppm Zn, 11 cultivars)”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Four excluder cultivars had 389 to 540 ppm Zn.
- Taxon
- soybeanGlycine maxe1
- Material
- excludere0
- Outcome
- Zne0
- Value
- 389 to 540 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excluder (389 to 540 ppm Zn, 4 cultivars)”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Soil Zn additions significantly increased root and foliar Mn contents to phytotoxic levels.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Soil Zn additionse0
- Outcome
- root and foliar Mn contentse0
- Direction
- increasede0
- Qualifier
- at both pH 5.5 and 6.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil Zn additions significantly increased root and foliar Mn contents to reported phytotoxic levels at both pH 5.5 and 6.5”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Soil Zn additions did not influence extractable soil Mn.
- Taxon
- soybeanGlycine maxe2
- Treatment
- Soil Zn additionse1
- Outcome
- DTPA‐TEA extractable soil Mne0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not influence DTPA‐TEA extractable soil Mn”
e1“Soil Zn additions significantly increased”
e2“Twenty soybean ( Glycine max L. Merr.) cultivars”
Claim · model-written summary
Cultivars differed significantly in root and leaf Mn contents.
- Taxon
- soybeanGlycine maxe1
- Outcome
- root and leaf Mn contentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant cultivar differences in root and leaf Mn contents were observed”
e1“Twenty soybean ( Glycine max L. Merr.) cultivars”
The same questions in other papers
zinc atom · nutrient: content · Glycine max (soybean)Positive and negative results
15 papers in the same direction as this paper · 41 in the opposite direction
- positive
- positive
- positive
53 papers more in this group
See all 57 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.