Abstract
Soybean, Glycine max (L.) Merr., is planted during 3.5-4 mo across the Mid-South United States. Currently, no information exists regarding the effects of planting date on soybean yield loss from early season defoliation. In 2015 and 2016, to evaluate the effects of planting date on yield loss from defoliation, soybean were planted in field plots 2 wk apart from early April to mid-June, for a total of six planting dates. Each planting date included a nondefoliated control and a 100% defoliation treatment where leaves were manually excised at the V4 growth stage. Mean yield loss from defoliation varied across planting dates, with mid-April plantings having the least amount yield reduction, 573 kg/ha, and early-June plantings having the greatest yield reduction, 904 kg/ha. Percent yield reduction from defoliation increased as planting was delayed, suggesting that defoliation thresholds might need adjustment based on planting date and yield potential. However, more research is needed at lower levels of defoliation to accurately delineate such thresholds.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Mid-April soybean planting had the least yield loss from full V4 defoliation, 573 kg/ha.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- defoliatione0
- Outcome
- yield reductione0
- Direction
- leaste0
- Value
- 573 kg/hae0
- Qualifier
- mid-April plantingse0
- Comparator
- early-June plantingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Mean yield loss from defoliation varied across planting dates, with mid-April plantings having the least amount yield reduction, 573 kg/ha, and early-June plantings having the greatest yield reduction, 904 kg/ha.”
Claim · model-written summary
Early-June soybean planting had the greatest yield loss from full V4 defoliation, 904 kg/ha.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- defoliatione0
- Outcome
- yield reductione0
- Direction
- greateste0
- Value
- 904 kg/hae0
- Qualifier
- early-June plantingse0
- Comparator
- mid-April plantingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Mean yield loss from defoliation varied across planting dates, with mid-April plantings having the least amount yield reduction, 573 kg/ha, and early-June plantings having the greatest yield reduction, 904 kg/ha.”
Claim · model-written summary
Percent yield reduction from defoliation increased with delayed planting.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- defoliatione0
- Outcome
- Percent yield reductione0
- Direction
- increasede0
- Qualifier
- planting was delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Percent yield reduction from defoliation increased as planting was delayed”
Claim · model-written summary
The authors suggest adjusting defoliation thresholds by planting date and yield potential, pending research at lower defoliation levels.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- defoliation thresholds might need adjustment based on planting date and yield potentiale0
- Qualifier
- more research is needed at lower levels of defoliatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“suggesting that defoliation thresholds might need adjustment based on planting date and yield potential. However, more research is needed at lower levels of defoliation to accurately delineate such thresholds.”
The same questions in other papers
pruning · yield · Glycine max (soybean)Positive and negative results
32 papers in the same direction as this paper · 76 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
106 papers more in this group
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.