Abstract
Abstract Research has been conducted on the response of determinate and indeterminate soybean [ Glycine max (L.) Merr.] to various plant‐damage treatments, but information is limited on the response of genotypes with a semideterminate growth habit. Our objective was to determine the yield response of a determinate cv., Forrest, and a semideterminate strain, R74‐334, to different levels of defoliation and plant cutoff at two growth stages. Treatments consisted of plants being cut off at half height, cut off at half height and defoliated below the cut, or completely defoliated. The treatments were applied to 25, 50, 75, or 100% of the plants at growth stages V5 and R3. These field experiments were conducted on a Captina silt loam (fine‐silty, mixed, mesic Typic Fragiudult) during two growing seasons. Mean yields of Forrest were significantly higher than those of R74‐334 during both years. Most of the treatments at V5 did not significantly decrease yield and in three treatments significantly increased yield. Yields generally were significantly reduced at R3 by treatments involving 50% or greater plant damage. The greatest reduction in yield occurred when 100% of the plants were cut off at half height and then completely defoliated. Yield of Forrest was reduced by 51% and that of R74‐334 by 44% with this treatment. The yield of both genotypes was reduced 33% by 100% defoliaton at stage R3. None of the first order interactions involving genotypes was statistically significant, which indicates that the two genotypes responded similarly to these plant‐damage treatments. Although there was some variability in the response of the genotypes to certain treatments, the data indicate that determinate and semideterminate soybean recover about the same from plant cutoff and/or defoliation. Therefore, the same loss values that have been developed for determinate soybean probably should be used for semideterminate types.
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Claims 10
Claim · model-written summary
Forrest yielded significantly more than R74‐334 in both years.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Mean yields of Forrest were significantly higher than those of R74‐334 during both years.”
Claim · model-written summary
Most V5 damage treatments did not significantly reduce yield.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- treatments at V5e0
- Outcome
- yielde0
- Direction
- did not significantly decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Most of the treatments at V5 did not significantly decrease yield”
Claim · model-written summary
Three V5 treatments significantly increased yield.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- three treatmentse0
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“in three treatments significantly increased yield.”
Claim · model-written summary
At R3, treatments damaging at least half the plants generally significantly reduced yield.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- R3e0
- Treatment
- treatments involving 50% or greater plant damagee0
- Outcome
- Yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Yields generally were significantly reduced at R3 by treatments involving 50% or greater plant damage.”
Claim · model-written summary
Cutoff followed by complete defoliation of all plants caused the greatest yield reduction.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- 100% of the plants were cut off at half height and then completely defoliatede0
- Outcome
- yielde0
- Direction
- greatest reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The greatest reduction in yield occurred when 100% of the plants were cut off at half height and then completely defoliated.”
Claim · model-written summary
That cutoff and defoliation treatment reduced Forrest yield by 51%.
- Taxon
- SoybeanGlycine maxt0
- Material
- Forreste1
- Treatment
- 100% of the plants were cut off at half height and then completely defoliatede0
- Outcome
- Yield of Forreste1
- Direction
- reducede1
- Value
- 51%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The greatest reduction in yield occurred when 100% of the plants were cut off at half height and then completely defoliated.”
e1“Yield of Forrest was reduced by 51% and that of R74‐334 by 44% with this treatment.”
Claim · model-written summary
That cutoff and defoliation treatment reduced R74‐334 yield by 44%.
- Taxon
- SoybeanGlycine maxt0
- Material
- R74‐334e1
- Treatment
- 100% of the plants were cut off at half height and then completely defoliatede0
- Outcome
- Yielde1
- Direction
- reducede1
- Value
- 44%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The greatest reduction in yield occurred when 100% of the plants were cut off at half height and then completely defoliated.”
e1“Yield of Forrest was reduced by 51% and that of R74‐334 by 44% with this treatment.”
Claim · model-written summary
Complete defoliation at R3 reduced both genotypes’ yield by 33%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- 100% defoliaton at stage R3e0
- Outcome
- yield of both genotypese0
- Direction
- reducede0
- Value
- 33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The yield of both genotypes was reduced 33% by 100% defoliaton at stage R3.”
Claim · model-written summary
No first order genotype interactions were significant, indicating similar damage responses.
- Taxon
- SoybeanGlycine maxt0
- Material
- genotypese0
- Treatment
- plant‐damage treatmentse0
- Outcome
- first order interactions involving genotypese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“None of the first order interactions involving genotypes was statistically significant, which indicates that the two genotypes responded similarly to these plant‐damage treatments.”
Claim · model-written summary
Authors recommend using determinate soybean loss values for semideterminate types.
- Taxon
- soybeanGlycine maxe0
- Outcome
- same loss values that have been developed for determinate soybean probably should be used for semideterminate typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, the same loss values that have been developed for determinate soybean probably should be used for semideterminate types.”
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