Abstract
During sprinkler irrigation some water is lost due to drift and evaporation. After irrigation, plant‐intercepted water is lost due to evaporation. The water loss causes microclimatic changes, which may involve positive or negative plant physiological responses. We studied the changes in net photosynthesis of maize ( Zea mays L.) and alfalfa ( Medicago sativa L.) associated with irrigation with a solid‐set sprinkler system. For each species, measurements were made simultaneously in two plots, one being irrigated and the other not being irrigated. Two automatic canopy chambers connected to two CO 2 infrared gas analyzers were used. Sprinkler irrigation decreased air temperature (1.5°C on maize, 1.7°C on alfalfa), air vapor pressure deficit (VPD) (0.44 kPa for both crops) and canopy temperature (5.1°C on maize, 5.9°C on alfalfa). Sprinkler irrigation decreased maize net photosynthesis on 80% of the days and the mean reduction was 19%. Sprinkler irrigation increased alfalfa net photosynthesis on 36% of days, decreased it on 14% of days, and had no effect on half of the days. The decrease of maize net photosynthesis during sprinkler irrigation was linked to the high leaf wettability (water contact angles from 60–80°) and the decrease in temperature below the optimum range for photosynthesis. The higher hydrophobicity of alfalfa leaves (water contact angles >120°) and the wide range of optimum temperature for alfalfa photosynthesis may be the reasons why photosynthesis remained unaffected by sprinkler irrigation. The results suggest that daytime sprinkler irrigation with solid‐set should be avoided for maize but can be used for alfalfa.
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Claims 14
Claim · model-written summary
Sprinkler irrigation lowered air temperature over maize by 1.5°C.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprinkler irrigation decreased air temperature (1.5°C on maize, 1.7°C on alfalfa)”
Claim · model-written summary
Sprinkler irrigation lowered air temperature over alfalfa by 1.7°C.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- Sprinkler irrigatione0
- Outcome
- air temperaturee0
- Direction
- decreasede0
- Value
- 1.7°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprinkler irrigation decreased air temperature (1.5°C on maize, 1.7°C on alfalfa)”
Claim · model-written summary
Sprinkler irrigation lowered air vapor pressure deficit by 0.44 kPa for maize.
- Treatment
- Sprinkler Irrigationt0
- Outcome
- air vapor pressure deficite0
- Direction
- decreaseinferrede0
- Value
- 0.44 kPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“air vapor pressure deficit (VPD) (0.44 kPa for both crops)”
t0“Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
Sprinkler irrigation lowered air vapor pressure deficit by 0.44 kPa for alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Sprinkler Irrigationt0
- Outcome
- air vapor pressure deficite0
- Direction
- decreaseinferrede0
- Value
- 0.44 kPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“air vapor pressure deficit (VPD) (0.44 kPa for both crops)”
t0“Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
Sprinkler irrigation lowered maize canopy temperature by 5.1°C.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canopy temperature (5.1°C on maize, 5.9°C on alfalfa).”
t0“Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
Sprinkler irrigation lowered alfalfa canopy temperature by 5.9°C.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Sprinkler Irrigationt0
- Outcome
- canopy temperaturee0
- Direction
- decreaseinferrede0
- Value
- 5.9°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canopy temperature (5.1°C on maize, 5.9°C on alfalfa).”
t0“Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
Sprinkler irrigation decreased maize net photosynthesis on 80% of days, averaging a 19% reduction.
- Treatment
- Sprinkler irrigatione0
- Outcome
- net photosynthesise0
- Direction
- decreasede0
- Value
- 19%e0
- Qualifier
- 80% of the dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprinkler irrigation decreased maize net photosynthesis on 80% of the days and the mean reduction was 19%.”
Claim · model-written summary
Sprinkler irrigation increased alfalfa net photosynthesis on 36% of days.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Sprinkler irrigatione0
- Outcome
- net photosynthesise0
- Direction
- increasede0
- Value
- 36% of dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprinkler irrigation increased alfalfa net photosynthesis on 36% of days”
Claim · model-written summary
Sprinkler irrigation decreased alfalfa net photosynthesis on 14% of days.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Sprinkler Irrigationt0
- Outcome
- Net Photosynthesist0
- Direction
- decreasede0
- Value
- 14% of dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased it on 14% of days”
t0“Daytime Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
Sprinkler irrigation had no effect on alfalfa net photosynthesis on half the days.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Sprinkler Irrigationt0
- Outcome
- Net Photosynthesist0
- Direction
- no effecte0
- Value
- half of the dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had no effect on half of the days.”
t0“Daytime Sprinkler Irrigation Effects on Net Photosynthesis of Maize and Alfalfa”
Claim · model-written summary
The maize photosynthesis decline was linked to leaf wettability and temperature below its optimum.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease of maize net photosynthesis during sprinkler irrigation was linked to the high leaf wettability (water contact angles from 60–80°) and the decrease in temperature below the optimum range for photosynthesis.”
Claim · model-written summary
Alfalfa leaf hydrophobicity and broad optimal temperature range may explain the lack of photosynthetic response.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- photosynthesis remained unaffectede0
- Value
- >120°e0
- Qualifier
- higher hydrophobicity of alfalfa leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher hydrophobicity of alfalfa leaves (water contact angles >120°) and the wide range of optimum temperature for alfalfa photosynthesis may be the reasons why photosynthesis remained unaffected by sprinkler irrigation.”
Claim · model-written summary
The authors suggest avoiding daytime solid-set sprinkler irrigation for maize.
- Outcome
- daytime sprinkler irrigation with solid‐set should be avoidede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that daytime sprinkler irrigation with solid‐set should be avoided for maize but can be used for alfalfa.”
Claim · model-written summary
The authors suggest daytime solid-set sprinkler irrigation can be used for alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- can be used for alfalfae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that daytime sprinkler irrigation with solid‐set should be avoided for maize but can be used for alfalfa.”
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See all 47 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.