Abstract
Dry weight, leaf area, light interception and canopy photosynthesis were measured during 3- or 5-week regrowth periods of Setaria anceps/Desmodium intortum swards cut to 7.5 or 15 cm. Dry matter production during the experiment and over the growing season increased with cutting height and with interval between defoliations, but the proportion of grass to legume was unaffected. These effects of defoliation on dry matter production were similar to those estimated for integrated canopy photosynthesis from measured light interception and calculated leaf photosynthetic characteristics. Height and frequency of defoliation had no effect on canopy extinction coefficient for light, nor on the leaf photosynthetic characteristics, except for the first 1-2 weeks after defoliation when leaf photosynthetic rates appeared to be depressed. The main effects of height and frequency of defoliation on dry matter production were through their effects on leaf area index and light interception.
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Claims 8
Claim · model-written summary
Sward dry matter production increased with cutting height.
- Taxon
- Setaria anceps/Desmodium intortume1
- Treatment
- cutting heighte0
- Outcome
- Dry matter productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Dry matter production during the experiment and over the growing season increased with cutting height and with interval between defoliations”
e1“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Sward dry matter production increased with the interval between defoliations.
- Taxon
- Setaria anceps/Desmodium intortume1
- Treatment
- interval between defoliationse0
- Outcome
- Dry matter productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Dry matter production during the experiment and over the growing season increased with cutting height and with interval between defoliations”
e1“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Defoliation did not change the grass to legume proportion.
- Taxon
- Setaria anceps/Desmodium intortume1
- Treatment
- defoliatione2
- Outcome
- proportion of grass to legumee0
- Direction
- unaffectede0
Not reportedComparator
Verbatim
e0“but the proportion of grass to legume was unaffected”
e1“Setaria anceps/Desmodium intortum swards”
e2“Dry matter production during the experiment and over the growing season increased with cutting height and with interval between defoliations”
Claim · model-written summary
Defoliation effects on dry matter production resembled estimates from integrated canopy photosynthesis.
Verbatim
e0“These effects of defoliation on dry matter production were similar to those estimated for integrated canopy photosynthesis from measured light interception and calculated leaf photosynthetic characteristics”
e1“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Defoliation height and frequency had no effect on canopy light extinction coefficient.
- Taxon
- Setaria anceps/Desmodium intortume1
- Treatment
- Height and frequency of defoliatione0
- Outcome
- canopy extinction coefficient for lighte0
- Direction
- no effecte0
Not reportedComparator
Verbatim
e0“Height and frequency of defoliation had no effect on canopy extinction coefficient for light”
e1“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Defoliation height and frequency did not affect leaf photosynthetic characteristics overall.
- Taxon
- Setaria anceps/Desmodium intortume2
- Treatment
- Height and frequency of defoliatione1
- Outcome
- leaf photosynthetic characteristicse0
- Direction
- no effecte1
- Qualifier
- except for the first 1-2 weeks after defoliatione0
Not reportedComparator
Verbatim
e0“nor on the leaf photosynthetic characteristics, except for the first 1-2 weeks after defoliation”
e1“Height and frequency of defoliation had no effect on canopy extinction coefficient for light, nor on the leaf photosynthetic characteristics”
e2“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Leaf photosynthetic rates appeared depressed during the first one to two weeks after defoliation.
Verbatim
e0“the first 1-2 weeks after defoliation when leaf photosynthetic rates appeared to be depressed”
e1“Setaria anceps/Desmodium intortum swards”
Claim · model-written summary
Defoliation effects on dry matter production operated mainly through leaf area index and light interception.
Verbatim
e0“The main effects of height and frequency of defoliation on dry matter production were through their effects on leaf area index and light interception”
e1“Setaria anceps/Desmodium intortum swards”