Abstract
ABSTRACT The number of pods and seeds produced by soybean [ Glycine max (L.) Merr.] is related to canopy photosynthesis during flowering. The effect of low photosynthesis during only a portion of flowering (growth stage R1 to R5), however, is not well defined. Two field experiments were conducted at Lexington, KY (38°N), with seeds sown in mid‐May in 0.76‐m rows (20 seeds m −1 of row) and all plots irrigated as needed. In 2005/2006, plants (cultivars Pennyrile and Ripley) were shaded (60% in 2005 and 80% in 2006) for 4‐ to 9‐d periods just before or just after peak pod production. These treatments had almost no effect on seed number (significant reduction in only one of eight comparisons). In a second experiment (cv. Pennyrile, 2007/2008), shade cloth (60%) was placed over plants at growth stage R1.6 and removed at 7‐d intervals. The first 7 d of shade did not affect seed number, but 14 d of shade ending at roughly growth stage R3.0 reduced seed number by 16% and longer periods caused proportionally larger reductions. When shade cloth (80%) was put in place at 7‐d intervals (starting at R3.4) and left in place until maturity, seed number was reduced until the last treatment (put in place 4–7 d after the beginning of growth stage R6). Seed number was tolerant of short periods (4–9 d) of low assimilate supply during flowering, but could not recover from longer periods of shade (≥14 d), even when they occurred relatively early in the flowering period.
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Claims 5
Claim · model-written summary
Four to nine days of shade around peak pod production rarely reduced seed number.
- Taxon
- Soybean
Glycine maxt0 - Material
- Pennyrile and Ripleye0
- Treatment
- shaded (60% in 2005 and 80% in 2006) for 4‐ to 9‐d periodse0
- Outcome
- seed numbere0
- Direction
- almost no effecte0
- Qualifier
- significant reduction in only one of eight comparisonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants (cultivars Pennyrile and Ripley) were shaded (60% in 2005 and 80% in 2006) for 4‐ to 9‐d periods just before or just after peak pod production. These treatments had almost no effect on seed number (significant reduction in only one of eight comparisons).”
t0“Soybean”
Claim · model-written summary
The first seven days of shade did not affect seed number.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- first 7 d of shadee0
- Outcome
- seed numbere0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The first 7 d of shade did not affect seed number”
Claim · model-written summary
Fourteen days of shade ending around R3.0 reduced seed number by 16%.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- growth stage R3.0e0
- Treatment
- 14 d of shadee0
- Outcome
- seed numbere0
- Direction
- reducede0
- Value
- 16%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“14 d of shade ending at roughly growth stage R3.0 reduced seed number by 16%”
Claim · model-written summary
Longer shade periods caused proportionally larger reductions in seed number.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- longer periodse0
- Outcome
- reductionse0
- Direction
- larger reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“longer periods caused proportionally larger reductions”
Claim · model-written summary
Shade applied from R3.4 at seven day intervals reduced seed number until the last treatment.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- shade cloth (80%)e0
- Outcome
- seed numbere0
- Direction
- reducede0
- Qualifier
- until the last treatment (put in place 4–7 d after the beginning of growth stage R6)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“When shade cloth (80%) was put in place at 7‐d intervals (starting at R3.4) and left in place until maturity, seed number was reduced until the last treatment (put in place 4–7 d after the beginning of growth stage R6).”
The same questions in other papers
shade · yield · Glycine max (soybean)Results differ
47 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- negative
50 papers more in this group
See all 54 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.