Abstract
Iron deficiency is a major, yield‐limiting factor for large areas of soybean [ Glycine max (L.) Merr.] production in the North Central USA. Our objective was to evaluate the effectiveness of increasing both seeding density and rate of Fe–EDDHA in reducing early season (V2–V3) visual chlorosis scores (VCSs) and increasing seed number and grain yield. These measures were judged to reflect differences in Fe acquisition, manifest at maturity as seed Fe concentration (seed [Fe]). Three varieties (Vs), five seeding densities (SDs), and five seed‐applied Fe–EDDHA rates (IRs) were evaluated during 2000, 2001, and 2002. With mild to moderate Fe deficiency, applying Fe–EDDHA at planting markedly reduced early season VCSs, slightly increased seed number and grain yield, and had a similarly small influence on seed Fe concentration (seed [Fe]). In contrast, increasing SD had little influence on early season VCSs, but increased seed [Fe] as well as seed number and grain yield. Resistant and susceptible varieties differed in their response to increasing SDs and indicated that the more susceptible varieties (‘Daksoy’ and ‘Jim’) responded to increasing SD to a greater extent than the more resistant variety, ‘Corona’. Nonetheless, Corona's seed [Fe] usually exceeded that of Daksoy and Jim, whether in the near absence of Fe deficiency or in the presence of mild to moderate Fe deficiency. Fe acquisition, measured as seed [Fe], appeared to be regulated primarily by genotype, yet Fe acquisition of less Fe‐efficient varieties could be increased by increasing SD or reducing the severity of Fe deficiency.
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Claims 9
Claim · model-written summary
Fe–EDDHA reduced early visual chlorosis.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Fe–EDDHAe0
- Outcome
- early season VCSse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying Fe–EDDHA at planting markedly reduced early season VCSs”
t0“Soybean”
Claim · model-written summary
Fe–EDDHA slightly increased seed number and grain yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Fe–EDDHAe0
- Outcome
- seed number and grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying Fe–EDDHA at planting markedly reduced early season VCSs, slightly increased seed number and grain yield”
t0“Soybean”
Claim · model-written summary
Fe–EDDHA had a small influence on seed Fe concentration.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Fe–EDDHAe1
- Outcome
- seed Fe concentratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had a similarly small influence on seed Fe concentration (seed [Fe])”
t0“Soybean”
e1“applying Fe–EDDHA at planting markedly reduced early season VCSs”
Claim · model-written summary
Increasing seeding density had little influence on early chlorosis.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing SDe0
- Outcome
- early season VCSse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing SD had little influence on early season VCSs”
t0“Soybean”
Claim · model-written summary
Increasing seeding density increased seed Fe concentration.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing SDe0
- Outcome
- seed [Fe]e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing SD had little influence on early season VCSs, but increased seed [Fe] as well as seed number and grain yield.”
t0“Soybean”
Claim · model-written summary
Increasing seeding density increased seed number and grain yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing SDe0
- Outcome
- seed number and grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing SD had little influence on early season VCSs, but increased seed [Fe] as well as seed number and grain yield.”
t0“Soybean”
Claim · model-written summary
The susceptible varieties responded more strongly to seeding density than Corona.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Daksoy’ and ‘Jim’e0
- Outcome
- responded to increasing SDe0
- Direction
- greatere0
- Comparator
- ‘Corona’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the more susceptible varieties (‘Daksoy’ and ‘Jim’) responded to increasing SD to a greater extent than the more resistant variety, ‘Corona’.”
t0“Soybean”
Claim · model-written summary
Corona generally had higher seed Fe than Daksoy and Jim.
- Taxon
- soybeanGlycine maxt0
- Material
- Coronae0
- Outcome
- seed [Fe]e0
- Direction
- exceedede0
- Comparator
- Daksoy and Jime0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corona's seed [Fe] usually exceeded that of Daksoy and Jim”
t0“Soybean”
Claim · model-written summary
Genotype appeared to be the primary regulator of seed Fe acquisition.
- Taxon
- soybeanGlycine maxt0
- Material
- genotypee0
- Outcome
- Fe acquisitione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe acquisition, measured as seed [Fe], appeared to be regulated primarily by genotype”
t0“Soybean”
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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.