Abstract
Abstract The effects on yield of controlled water stress applied at various stages of development were studied on two varieties of soybean ( Glycine max (L.) Merr.), ‘Ransom’ and ‘Bragg.’ The plants were grown in a controlled environment chamber at 28/17 C with a 9‐hour photoperiod at 450 hlx and an interrupted dark period. Interruption of the dark period was suspended for 7 days to induce flowering. Groups of plants were subjected to water stress during flower induction, flowering, pod formation, and pod filling. Leaf water potential during stress fell as low as —23 bars, but after rewatering the potential of plants in all treatments returned approximately to normal. Plants stressed during flower induction and flowering produced fewer flowers, pods, and seeds than controls because of a shortened flowering period and abortion of some flowers. Stress during early pod formation caused greatest reduction in number of pods and seeds at harvest. However, yield as measured by weight of seeds was reduced most by stress during early formation and pod filling. Water stress at no stage of growth materially affected the oil or protein content of the seeds.
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Claims 6
Claim · model-written summary
Leaf water potential fell to —23 bars during stress.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- stresse0
- Outcome
- Leaf water potentiale0
- Direction
- felle0
- Value
- —23 barse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water potential during stress fell as low as —23 bars”
t0“Soybean”
Claim · model-written summary
Leaf water potential returned approximately to normal after rewatering.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- rewateringe0
- Outcome
- potential of plantse0
- Direction
- returned approximately to normale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after rewatering the potential of plants in all treatments returned approximately to normal.”
t0“Soybean”
Claim · model-written summary
Stress at flower induction and flowering reduced flowers, pods, and seeds versus controls.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- stressed during flower induction and floweringe0
- Outcome
- flowers, pods, and seedse0
- Direction
- fewere0
- Qualifier
- shortened flowering period and abortion of some flowerse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants stressed during flower induction and flowering produced fewer flowers, pods, and seeds than controls because of a shortened flowering period and abortion of some flowers.”
t0“Soybean”
Claim · model-written summary
Early pod formation stress produced the largest reduction in pods and seeds at harvest.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Stress during early pod formatione0
- Outcome
- number of pods and seeds at harveste0
- Direction
- greatest reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress during early pod formation caused greatest reduction in number of pods and seeds at harvest.”
t0“Soybean”
Claim · model-written summary
Early pod formation and pod filling stress reduced seed weight yield most.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- stress during early formation and pod fillinge0
- Outcome
- yield as measured by weight of seedse0
- Direction
- reduced moste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield as measured by weight of seeds was reduced most by stress during early formation and pod filling.”
t0“Soybean”
Claim · model-written summary
Water stress at any growth stage did not materially affect seed oil or protein content.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Water stresse0
- Outcome
- oil or protein content of the seedse0
- Direction
- no stage of growth materially affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress at no stage of growth materially affected the oil or protein content of the seeds.”
t0“Soybean”
The same questions in other papers
drought · quality: protein · Glycine max (soybean)Results differ
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- positive
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- positive
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See all 28 papers →stage · phenology · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
1 paper more in this group
See all 5 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.