Abstract
SUMMARY Sugar‐beet plants were defoliated during growth in seven experiments from 1968 to 1974 either (1) by removing each leaf as it became fully expanded or (2) by removing with scissors as soon as possible all leaves except certain groups up to leaf 50 , but mainly 6 to 20 , or (3) by treating the growing point chemically or mechanically in an attempt to stop the production of leaves after the twentieth. Removing mature leaves decreased yields considerably, but removing all leaves except 6–20 did not decrease significantly total dry matter yield of the whole plant and in one experiment increased it by 7% and root weight by 15%. Remaining leaves had a greater photosynthetic efficiency as measured by growth analysis and a 14 C0 2 feeding technique because they were less shaded or there was reduced competition for some nutrient or essential growth component. Additional leaves formed beyond the twentieth resulted in a proportionately lower photosynthetic efficiency of all leaves, but attempts to treat the plant to stop production of new leaves beyond the twentieth were inconclusive.
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Claims 6
Claim · model-written summary
Removing mature leaves substantially decreased sugar beet yields.
- Taxon
- Sugar‐beet
Beta vulgaris subsp. vulgarise1 - Treatment
- Removing mature leavese0
- Outcome
- yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing mature leaves decreased yields considerably”
e1“Sugar‐beet plants”
Claim · model-written summary
Retaining leaves 6–20 while removing others did not significantly decrease total plant dry matter yield.
- Taxon
- Sugar‐beetBeta vulgaris subsp. vulgarise1
- Treatment
- removing all leaves except 6–20e0
- Outcome
- total dry matter yield of the whole plante0
- Direction
- did not decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removing all leaves except 6–20 did not decrease significantly total dry matter yield of the whole plant”
e1“Sugar‐beet plants”
Claim · model-written summary
In one experiment, retaining leaves 6–20 increased total dry matter yield by 7%.
- Taxon
- Sugar‐beetBeta vulgaris subsp. vulgarise1
- Treatment
- removing all leaves except 6–20e0
- Outcome
- total dry matter yield of the whole plante0
- Direction
- increasede0
- Value
- 7%e0
- Qualifier
- in one experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removing all leaves except 6–20 did not decrease significantly total dry matter yield of the whole plant and in one experiment increased it by 7%”
e1“Sugar‐beet plants”
Claim · model-written summary
In one experiment, retaining leaves 6–20 increased root weight by 15%.
- Taxon
- Sugar‐beetBeta vulgaris subsp. vulgarise1
- Treatment
- removing all leaves except 6–20e0
- Outcome
- root weighte0
- Direction
- increasede0
- Value
- 15%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removing all leaves except 6–20 did not decrease significantly total dry matter yield of the whole plant and in one experiment increased it by 7% and root weight by 15%”
e1“Sugar‐beet plants”
Claim · model-written summary
Remaining leaves had greater photosynthetic efficiency.
- Taxon
- Sugar‐beetBeta vulgaris subsp. vulgarise1
- Treatment
- Remaining leavese0
- Outcome
- photosynthetic efficiencye0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remaining leaves had a greater photosynthetic efficiency as measured by growth analysis and a 14 C0 2 feeding technique”
e1“Sugar‐beet plants”
Claim · model-written summary
Leaves formed beyond the twentieth reduced overall leaf photosynthetic efficiency proportionately.
- Taxon
- Sugar‐beetBeta vulgaris subsp. vulgarise1
- Organ / stage
- Additional leaves formed beyond the twentiethe0
- Outcome
- photosynthetic efficiency of all leavese0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional leaves formed beyond the twentieth resulted in a proportionately lower photosynthetic efficiency of all leaves”
e1“Sugar‐beet plants”