Abstract
Understanding how defoliation affects soybean [ Glycine max (L.) Merr.] yield during the seed‐filling period will aid in making management recommendations for control of stresses that reduce yield through defoliation. Because previous research has studied defoliation effects at only one or two specific stages of seed filling, our objective was to gain a greater understanding of the mechanisms for yield reduction with defoliation at weekly intervals across the seed‐filling period. Defoliations were conducted from the bottom of the canopy upward to mimic the progress of soybean rust. Two experiments, one in Kentucky (38° N lat) and the other in Louisiana (30° N lat), were conducted in randomized complete block designs in split‐split plot arrangements with four replications. Main plots were two cultivars, split plots were defoliation timings at weekly intervals during seed filling, and split‐split plots were defoliation levels of 0, 33, 66, and 100% leaf removal. Data were obtained on yield and several growth dynamic and yield component factors. Defoliation‐induced yield losses corresponded more closely with percentage of light interception reductions than percentage of leaf area reductions. During the R5 to R6 period, defoliation levels sufficient to reduce light interception by 18 to 23% were required to cause yield loss. Yield losses from total defoliation were greatest at early seed filling (78%) but gradually diminished as seed filling progressed. Each 0.1 delay in developmental stage resulted in a 5% decline in yield loss.
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Claims 4
Claim · model-written summary
Defoliation-related soybean yield losses tracked reductions in light interception more closely than reductions in leaf area.
- Taxon
- Soybean
Glycine maxt0 - Outcome
- Defoliation‐induced yield lossese0
- Comparator
- percentage of light interception reductions than percentage of leaf area reductionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation‐induced yield losses corresponded more closely with percentage of light interception reductions than percentage of leaf area reductions”
t0“Soybean”
Claim · model-written summary
During R5 to R6, defoliation had to reduce light interception by 18 to 23% to cause soybean yield loss.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- R5 to R6 periode0
- Treatment
- defoliation levelse0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 18 to 23%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the R5 to R6 period, defoliation levels sufficient to reduce light interception by 18 to 23% were required to cause yield loss”
t0“Soybean”
Claim · model-written summary
Total defoliation caused the greatest soybean yield loss, 78%, at early seed filling; loss declined later.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- early seed fillinge0
- Treatment
- total defoliatione0
- Outcome
- Yield lossese0
- Direction
- greateste0
- Value
- 78%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield losses from total defoliation were greatest at early seed filling (78%) but gradually diminished as seed filling progressed”
t0“Soybean”
Claim · model-written summary
Each 0.1 delay in developmental stage reduced soybean yield loss by 5%.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- developmental stagee0
- Outcome
- yield losse0
- Direction
- declinee0
- Value
- 5%e0
- Qualifier
- 0.1 delaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each 0.1 delay in developmental stage resulted in a 5% decline in yield loss”
t0“Soybean”
The same questions in other papers
pruning · yield · Glycine max (soybean)Positive and negative results
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See all 110 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.