Abstract
Experiments were conducted to determine the effect on soybean seed yields and yield components of increasing the amount of light available in the soybean leaf canopy and to evaluate the photosynthetic contribution of leaves at different levels in the canopy. Wide spectrum fluorescent lamps were placed at three levels in the canopies of ‘Amsoy’ and ‘Wayne’ varieties planted in rows 50‐cm and 100‐cm apart. White reflective polyethylene strips were placed between the rows. At harvest each plant was divided into top, middle, and bottom thirds corresponding to the levels of artificial lamps in the canopy. Measurements of apparent photosynthesis (AP) and respiration of individual soybean leaves were made with a plexiglass single leaf photosynthesis chamber. AP and respiration rates (rag CO 2 /dm 2 /hr) were determined by recording the change in CO 2 concentration with time in a closed system. Adding light increased the yields of bottom, middle, and top canopy positions of plants 30, 20, and 2%, respectively. Light‐rich plants had more seeds, nodes, pods, branches, pods per node, seeds per pod, and a higher oil content than normal plants. Protein content and seed size were decreased by adding light. The rates of AP of bottom and middle soybean leaves were 13 and 60% of the 20.2 mg CO 2 /dm 2 /hr rate of top leaves under natural canopy conditions. When exposed to full sunlight, bottom and middle leaves fixed 258 and 50% more CO 2 , respectively, than when naturally shaded. Respiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CORespiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CO 2 /dm 2 /hr, respectively.
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 15
Claim · model-written summary
Adding light increased the yield of bottom canopy positions of soybean plants by 30%.
- Taxon
- Soybeans
Glycine maxt0 - Organ / stage
- bottome1
- Treatment
- Adding lighte1
- Outcome
- yieldse1
- Direction
- increasede1
- Value
- 30e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e1“Adding light increased the yields of bottom, middle, and top canopy positions of plants 30, 20, and 2%, respectively”
Claim · model-written summary
Adding light increased the yield of middle canopy positions of soybean plants by 20%.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- middlee1
- Treatment
- Adding lighte1
- Outcome
- yieldse1
- Direction
- increasede1
- Value
- 20e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e1“Adding light increased the yields of bottom, middle, and top canopy positions of plants 30, 20, and 2%, respectively”
Claim · model-written summary
Adding light increased the yield of top canopy positions of soybean plants by 2%.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- tope1
- Treatment
- Adding lighte1
- Outcome
- yieldse1
- Direction
- increasede1
- Value
- 2%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e1“Adding light increased the yields of bottom, middle, and top canopy positions of plants 30, 20, and 2%, respectively”
Claim · model-written summary
Light-rich soybean plants had more seeds, nodes and pods than normal plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- Light‐rich plantse2
- Outcome
- seeds, nodes, podse2
- Direction
- moree2
- Comparator
- normal plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e2“Light‐rich plants had more seeds, nodes, pods, branches, pods per node, seeds per pod, and a higher oil content than normal plants”
Claim · model-written summary
Light-rich soybean plants had more branches, pods per node and seeds per pod than normal plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- Light‐rich plantse2
- Outcome
- branches, pods per node, seeds per pode2
- Direction
- moree2
- Comparator
- normal plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e2“Light‐rich plants had more seeds, nodes, pods, branches, pods per node, seeds per pod, and a higher oil content than normal plants”
Claim · model-written summary
Light-rich soybean plants had a higher seed oil content than normal plants.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- Light‐rich plantse2
- Outcome
- oil contente2
- Direction
- highere2
- Comparator
- normal plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e2“Light‐rich plants had more seeds, nodes, pods, branches, pods per node, seeds per pod, and a higher oil content than normal plants”
Claim · model-written summary
Adding light decreased protein content and seed size of soybean seeds.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- adding lighte3
- Outcome
- Protein content and seed sizee3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e3“Protein content and seed size were decreased by adding light”
Claim · model-written summary
Apparent photosynthesis of bottom soybean leaves was 13% of that of top leaves under natural canopy conditions.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- bottome4
- Outcome
- rates of APe4
- Direction
- lowerinferrede4
- Value
- 13e4
- Comparator
- rate of top leavese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e4“The rates of AP of bottom and middle soybean leaves were 13 and 60% of the 20.2 mg CO 2 /dm 2 /hr rate of top leaves under natural canopy conditions”
Claim · model-written summary
Apparent photosynthesis of middle soybean leaves was 60% of that of top leaves under natural canopy conditions.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- middlee4
- Outcome
- rates of APe4
- Direction
- lowerinferrede4
- Value
- 60%e4
- Comparator
- rate of top leavese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e4“The rates of AP of bottom and middle soybean leaves were 13 and 60% of the 20.2 mg CO 2 /dm 2 /hr rate of top leaves under natural canopy conditions”
Claim · model-written summary
Bottom soybean leaves fixed 258% more CO2 in full sunlight than when naturally shaded.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- bottome5
- Treatment
- When exposed to full sunlighte5
- Outcome
- CO 2e5
- Direction
- moree5
- Value
- 258e5
- Comparator
- when naturally shadede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e5“When exposed to full sunlight, bottom and middle leaves fixed 258 and 50% more CO 2 , respectively, than when naturally shaded”
Claim · model-written summary
Middle soybean leaves fixed 50% more CO2 in full sunlight than when naturally shaded.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- middlee5
- Treatment
- When exposed to full sunlighte5
- Outcome
- CO 2e5
- Direction
- moree5
- Value
- 50%e5
- Comparator
- when naturally shadede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e5“When exposed to full sunlight, bottom and middle leaves fixed 258 and 50% more CO 2 , respectively, than when naturally shaded”
Claim · model-written summary
Soybean leaf respiration rates decreased with depth in the canopy.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- Respiration ratese6
- Direction
- decreasede6
- Qualifier
- with depth in the canopye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e6“Respiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CO 2 /dm 2 /hr, respectively”
Claim · model-written summary
Top soybean leaves had a respiration rate of 6.8 mg CO2/dm2/hr.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- Tope6
- Outcome
- respiration ratese6
- Value
- 6.8e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e6“Respiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CO 2 /dm 2 /hr, respectively”
Claim · model-written summary
Middle soybean leaves had a respiration rate of 4.3 mg CO2/dm2/hr.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- middlee6
- Outcome
- respiration ratese6
- Value
- 4.3e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e6“Respiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CO 2 /dm 2 /hr, respectively”
Claim · model-written summary
Bottom soybean leaves had a respiration rate of 2.8 mg CO2/dm2/hr.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- bottome6
- Outcome
- respiration ratese6
- Value
- 2.8e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influence of Supplemental Light on Apparent Photosynthesis, Yield, and Yield Components of Soybeans (Glycine max L.)”
e6“Respiration rates decreased with depth in the canopy. Top, middle, and bottom leaves had respiration rates of 6.8, 4.3, and 2.8, mg CO 2 /dm 2 /hr, respectively”
The same questions in other papers
light · yield · Glycine max (soybean)Positive and negative results
49 papers in the same direction as this paper · 21 in the opposite direction
- positive
- positive
- positive
67 papers more in this group
See all 71 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.