Abstract
In response to rising input costs and narrowing profit margins, soybean [ Glycine max (L.) Merr.] producers are continually looking for ways to increase soybean yield. One approach being promoted is the use of foliar fungicides, for both foliar pathogen control and nonfungicidal plant physiological effects. The objective of this field experiment was to evaluate a strobilurin and a triazole alone or in combination on soybean in the absence of foliar diseases to determine the potential effect on soybean growth and yield. The experiment was conducted in Iowa at one location in 2005 and two locations in 2006 with four soybean cultivars. Triazole (tebuconazole), a curative fungicide and strobilurin (pyraclostrobin), a preventative fungicide, were applied alone and in combination at growth stages R1, R3, and R5. Low levels of foliar diseases were observed. Seed yield for the control treatment averaged 4308 kg ha −1 across all sites. Foliar fungicides did not affect soybean seed yield. Few differences were observed among the treatments in soybean growth and yield components. Total biomass was 10% greater with the pyraclostrobin applied at R3 compared with the control, and was a result of increased stem weight. In this study, fungicides applied in the absence of foliar disease did not produce nonfungicidal physiological effect or associated yield improvement. It was concluded that environmental conditions and assessment of disease levels should be used as a guide for foliar fungicide application on soybean.
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Claims 7
Claim · model-written summary
Foliar disease levels were low.
- Taxon
- soybean
Glycine maxt0 - Outcome
- Low levels of foliar diseasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low levels of foliar diseases were observed.”
t0“Soybean”
Claim · model-written summary
Control soybean seed yield averaged 4308 kg ha −1 across sites.
- Taxon
- soybeanGlycine maxt0
- Treatment
- control treatmente0
- Outcome
- Seed yielde0
- Value
- 4308 kg ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield for the control treatment averaged 4308 kg ha −1 across all sites.”
t0“Soybean”
Claim · model-written summary
Foliar fungicides did not affect soybean seed yield.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Foliar fungicidese0
- Outcome
- soybean seed yielde0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar fungicides did not affect soybean seed yield.”
Claim · model-written summary
Pyraclostrobin at R3 increased total biomass by 10% compared with the control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyraclostrobin applied at R3e0
- Outcome
- Total biomasse0
- Direction
- greatere0
- Value
- 10%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total biomass was 10% greater with the pyraclostrobin applied at R3 compared with the control, and was a result of increased stem weight.”
t0“Soybean”
Claim · model-written summary
The increased total biomass with pyraclostrobin at R3 was attributed to increased stem weight.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyraclostrobin applied at R3e0
- Outcome
- Total biomasse0
- Qualifier
- increased stem weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total biomass was 10% greater with the pyraclostrobin applied at R3 compared with the control, and was a result of increased stem weight.”
t0“Soybean”
Claim · model-written summary
Fungicides without foliar disease did not produce a physiological effect or yield improvement.
- Taxon
- soybeanGlycine maxt0
- Treatment
- fungicides applied in the absence of foliar diseasee0
- Outcome
- nonfungicidal physiological effect or associated yield improvemente0
- Direction
- did not producee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fungicides applied in the absence of foliar disease did not produce nonfungicidal physiological effect or associated yield improvement.”
t0“Soybean”
Claim · model-written summary
The authors recommend using environmental conditions and disease levels to guide foliar fungicide application.
- Taxon
- soybeanGlycine maxe0
- Outcome
- environmental conditions and assessment of disease levels should be used as a guide for foliar fungicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“environmental conditions and assessment of disease levels should be used as a guide for foliar fungicide application on soybean.”
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