Abstract
One objective of our research was to define the most critical stages for defoliation of indeterminate and determinate soybean [ Glycine max (L.) Merr.] strains. The second objective was to determine if yield loss from defoliation at R4.5 could be predicted by the average of loss at R4 and R5 and if loss at R5.5 could be predicted by the average of loss at R5 and R6. Response to 100% defoliation for an indeterminate cultivar, ‘Beeson,’ and a determinate experimental strain, A72‐407R, was evaluated at Ames, Iowa during 3 years. The strains were defoliated at R4 (full pod), R4.5, R5 (beginning seed), R5.5, and R6 (full seed). The indeterminate strain had an average yield loss across stages of 59% compared with 80% for the determinate strain, but the strain × stage interaction was not significant. The most critical stage for defoliation varied among environments, but was either R5 or R5.5 for both strains. The average yield loss at R4.5 of 72% was slightly greater than the average of loss at R4 and R5 of 68%. The average yield loss at R5.5 of 80% was significantly greater than the average of loss at R5 and R6 of 69%. Yield response to defoliation at R4.5 and R5.5 should be considered in estimating yield reduction from factors that cause defoliation of soybeans.
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Claims 7
Claim · model-written summary
Average yield loss across defoliation stages was 59% for the indeterminate strain.
- Taxon
- soybean
Glycine maxt0 - Material
- indeterminate straine0
- Treatment
- defoliationt0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 59%e0
- Qualifier
- 80%e0
- Comparator
- determinate straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The indeterminate strain had an average yield loss across stages of 59% compared with 80% for the determinate strain, but the strain × stage interaction was not significant.”
t0“Defoliation of Soybean”
Claim · model-written summary
Average yield loss across defoliation stages was 80% for the determinate strain.
- Taxon
- soybeanGlycine maxt0
- Material
- determinate straine0
- Treatment
- defoliationt0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 80%e0
- Qualifier
- 59%e0
- Comparator
- indeterminate straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The indeterminate strain had an average yield loss across stages of 59% compared with 80% for the determinate strain, but the strain × stage interaction was not significant.”
t0“Defoliation of Soybean”
Claim · model-written summary
The strain-by-stage interaction for yield loss was not significant.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Defoliationt0
- Outcome
- strain × stage interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the strain × stage interaction was not significant”
t0“Defoliation of Soybean”
Claim · model-written summary
The most critical defoliation stage varied by environment and was R5 or R5.5 in both strains.
- Taxon
- soybeanGlycine maxt0
- Outcome
- most critical stage for defoliatione0
- Value
- R5 or R5.5e0
- Qualifier
- varied among environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most critical stage for defoliation varied among environments, but was either R5 or R5.5 for both strains.”
t0“Defoliation of Soybean”
Claim · model-written summary
Yield loss at R4.5 was 72%, slightly greater than the 68% average at R4 and R5.
- Taxon
- soybeanGlycine maxt0
- Treatment
- R4.5e0
- Outcome
- yield losse0
- Direction
- slightly greatere0
- Value
- 72%e0
- Qualifier
- 68%e0
- Comparator
- R4 and R5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average yield loss at R4.5 of 72% was slightly greater than the average of loss at R4 and R5 of 68%.”
t0“Defoliation of Soybean”
Claim · model-written summary
Yield loss at R5.5 was 80%, significantly greater than the 69% average at R5 and R6.
- Taxon
- soybeanGlycine maxt0
- Treatment
- R5.5e0
- Outcome
- yield losse0
- Direction
- significantly greatere0
- Value
- 80%e0
- Qualifier
- 69%e0
- Comparator
- R5 and R6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average yield loss at R5.5 of 80% was significantly greater than the average of loss at R5 and R6 of 69%.”
t0“Defoliation of Soybean”
Claim · model-written summary
Yield estimates for defoliating factors should account for responses at R4.5 and R5.5.
- Taxon
- soybeansGlycine maxe0
- Outcome
- Yield response to defoliation at R4.5 and R5.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield response to defoliation at R4.5 and R5.5 should be considered in estimating yield reduction from factors that cause defoliation of soybeans.”
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