Abstract
In a greenhouse experiment corn plants were harvested 24 and 31 days following emergence from pots containing Bloomfield loamy sand (Psammentic Hapladalf). The soil CEC was 2.3 meq/100 g. The soil had 140 kg/ha of P determined with the Bray P1 extractant, and 220 kg/ha of 1 N neutral ammonium acetate extractable K. Calcium, Mg, K, and P concentrations in plant tissue were determined by emission spectroscopy. Treatment combinations were a factorial arrangement of 0, 2.5, and 5 ±/g of Cd and 0, 125, and 250 ±/g of Pb. At 24 days following emergence, there were significant main effects of Cd and Pb upon the Ca, Mg, K, and P concentration in corn plants. The Cd linear × Pb linear interaction significantly (α = .05) affected P concentration and uptake of each element. At 31 days following emergence, Cd and Pb main effects influenced the Ca, Mg, and K status of the plant, but had no significant effect upon P content. At this stage of development, there were three significant Cd-Pb interactions that affected nutrient concentration and four interactions that affected nutrient uptake. Results observed in this study suggest that the statistical significance of various effects depends upon stage of development of the corn plant, and that certain Cd-Pb interactions influenced nutrient concentration in the plant.
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Claims 8
Claim · model-written summary
Cadmium and lead had significant main effects on Ca, Mg, K and P concentrations at 24 days.
- Taxon
- corn plants
Zea mays subsp. mayse0 - Organ / stage
- 24 days following emergencee0
- Treatment
- Cd and Pbe0
- Outcome
- Ca, Mg, K, and P concentratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 24 days following emergence, there were significant main effects of Cd and Pb upon the Ca, Mg, K, and P concentration in corn plants.”
Claim · model-written summary
The linear Cd by Pb interaction significantly affected P concentration.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- Cd linear × Pb linear interactione0
- Outcome
- P concentratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd linear × Pb linear interaction significantly (α = .05) affected P concentration and uptake of each element.”
e1“P concentration in corn plants”
Claim · model-written summary
The linear Cd by Pb interaction significantly affected uptake of each element.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- Cd linear × Pb linear interactione0
- Outcome
- uptake of each elemente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd linear × Pb linear interaction significantly (α = .05) affected P concentration and uptake of each element.”
e1“P concentration in corn plants”
Claim · model-written summary
At 31 days, cadmium and lead influenced Ca, Mg and K status.
- Taxon
- corn plantsZea mays subsp. mayse1
- Organ / stage
- 31 days following emergencee0
- Treatment
- Cd and Pbe0
- Outcome
- Ca, Mg, and K statuse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 31 days following emergence, Cd and Pb main effects influenced the Ca, Mg, and K status of the plant”
e1“P concentration in corn plants”
Claim · model-written summary
At 31 days, cadmium and lead had no significant effect on P content.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- Cd and Pbe2
- Outcome
- P contente0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but had no significant effect upon P content.”
e1“P concentration in corn plants”
e2“Cd and Pb main effects influenced the Ca, Mg, and K status of the plant”
Claim · model-written summary
At 31 days, three significant Cd-Pb interactions affected nutrient concentration.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- Cd-Pb interactionse0
- Outcome
- nutrient concentratione0
- Value
- threee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At this stage of development, there were three significant Cd-Pb interactions that affected nutrient concentration”
e1“P concentration in corn plants”
Claim · model-written summary
At 31 days, four interactions affected nutrient uptake.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- interactionse0
- Outcome
- nutrient uptakee0
- Value
- foure0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four interactions that affected nutrient uptake.”
e1“P concentration in corn plants”
Claim · model-written summary
Significance of nutrient effects depended on corn developmental stage.
- Taxon
- corn plantZea mays subsp. mayse0
- Organ / stage
- stage of developmente0
- Outcome
- statistical significance of various effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the statistical significance of various effects depends upon stage of development of the corn plant”
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See all 46 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.