Abstract
Five lucerne cultivars were grown for 10 weeks during summer at two irrigation frequencies, specified by evaporation intervals of 38 and 76 mm. Changes in soil moisture were monitored by tensiometers installed at 15 and 30 cm depths. At the first harvest no significant difference in yield was found between treatments. At the second harvest, regrowth of all cultivars was depressed by frequent irrigation, but Du Puits was particularly affected. The yield depression caused by frequent irrigation continued for six months after the treatment ended. The reduced growth following frequent irrigation was related to low soil aeration. In this treatment air-filled pore space in the 15-30 cm horizon remained at or below 15 per cent, a critical level for plant growth. A period of waterlogging for 10 days when the temperature at 5 cm depth remained at approximately 30¦C led to reduced production and high mortality in all cultivars. Yields of Lahontan and Siro Peruvian at the end of the waterlogging period were significantly higher than yields of the other three cultivars. The possibility is suggested of increasing the tolerance of lucerne to poor aeration by natural selection on wet soils.
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Claims 10
Claim · model-written summary
First-harvest yield did not differ significantly between irrigation treatments.
- Taxon
- lucerne cultivars
Medicago sativat0 - Treatment
- two irrigation frequenciese1
- Outcome
- yielde0
- Direction
- no significant differencee0
- Comparator
- 38 and 76 mme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the first harvest no significant difference in yield was found between treatments”
e1“two irrigation frequencies, specified by evaporation intervals of 38 and 76 mm”
t0“lucerne cultivars”
Claim · model-written summary
Frequent irrigation depressed second-harvest regrowth of all cultivars.
- Taxon
- lucerne cultivarsMedicago sativat0
- Treatment
- frequent irrigatione0
- Outcome
- regrowthe0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“regrowth of all cultivars was depressed by frequent irrigation”
t0“lucerne cultivars”
Claim · model-written summary
Du Puits was particularly affected by frequent irrigation.
- Taxon
- lucerne cultivarsMedicago sativat0
- Material
- Du Puitse0
- Treatment
- frequent irrigatione1
- Outcome
- particularly affectede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Du Puits was particularly affected”
t0“lucerne cultivars”
e1“regrowth of all cultivars was depressed by frequent irrigation”
Claim · model-written summary
Yield depression after frequent irrigation persisted for six months after treatment.
- Taxon
- lucerne cultivarsMedicago sativat0
- Treatment
- frequent irrigatione0
- Outcome
- yielde0
- Direction
- depressione0
- Qualifier
- six months after the treatment endede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield depression caused by frequent irrigation continued for six months after the treatment ended”
t0“lucerne cultivars”
Claim · model-written summary
Reduced growth after frequent irrigation was related to low soil aeration.
- Taxon
- lucerne cultivarsMedicago sativat0
- Treatment
- frequent irrigatione0
- Outcome
- reduced growthe0
- Direction
- reducede0
- Qualifier
- low soil aeratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced growth following frequent irrigation was related to low soil aeration”
t0“lucerne cultivars”
Claim · model-written summary
Ten days of waterlogging at approximately 30¦C reduced production across cultivars.
- Taxon
- lucerne cultivarsMedicago sativat0
- Treatment
- waterlogging for 10 dayse0
- Outcome
- productione0
- Direction
- reducede0
- Qualifier
- approximately 30¦Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“waterlogging for 10 days when the temperature at 5 cm depth remained at approximately 30¦C led to reduced production”
t0“lucerne cultivars”
Claim · model-written summary
Ten days of waterlogging at approximately 30¦C caused high mortality across cultivars.
- Taxon
- lucerne cultivarsMedicago sativat0
- Treatment
- waterlogging for 10 dayse0
- Outcome
- mortalitye0
- Direction
- highe0
- Qualifier
- approximately 30¦Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“waterlogging for 10 days when the temperature at 5 cm depth remained at approximately 30¦C led to reduced production and high mortality”
t0“lucerne cultivars”
Claim · model-written summary
Lahontan yield was significantly higher than that of three other cultivars after waterlogging.
- Taxon
- lucerne cultivarsMedicago sativat0
- Material
- Lahontane0
- Treatment
- waterlogginge0
- Outcome
- Yieldse0
- Direction
- highere0
- Comparator
- the other three cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of Lahontan and Siro Peruvian at the end of the waterlogging period were significantly higher than yields of the other three cultivars”
t0“lucerne cultivars”
Claim · model-written summary
Siro Peruvian yield was significantly higher than that of three other cultivars after waterlogging.
- Taxon
- lucerne cultivarsMedicago sativat0
- Material
- Siro Peruviane0
- Treatment
- waterlogginge0
- Outcome
- Yieldse0
- Direction
- highere0
- Comparator
- the other three cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of Lahontan and Siro Peruvian at the end of the waterlogging period were significantly higher than yields of the other three cultivars”
t0“lucerne cultivars”
Claim · model-written summary
The authors suggest natural selection on wet soils to increase lucerne tolerance of poor aeration.
- Taxon
- lucerneMedicago sativae0
- Outcome
- natural selection on wet soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the tolerance of lucerne to poor aeration by natural selection on wet soils”
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