Abstract
SUMMARY Photosynthetic rates were monitored during the warm dry season in tea Clone 6/8 in a line-source irrigation × fertilizer experiment in the Southern Highlands of Tanzania. Irrigation and fertilizer increased photosynthetic rate both by enhancing photosynthetic rate per unit leaf area (A) in healthy leaves and by increasing the proportion of sunlight intercepted by photosynthetically efficient leaves. Irrigation-induced increases in A could be accounted for by increases in stomatal conductance (g) and associated reductions in leaf temperature. Fertilizer at an annual application rate of 225 kg N ha -1 caused increases in A associated with increases in g and improved responses to ambient CO 2 concentration and illuminance (photon flux density, PFD). However, a further increase in fertilizer application rate to 375 kg N ha -1 a -1 decreased A in spite of increasing g. Light-saturation of photosynthesis occurred only at the higher fertilizer application rate. In unfertilized tea or tea fertilized at the lower rate, A decreased at a PFD of between 1400 and 2000 μmol m -2 s -l . These results are discussed in terms of the relation between photosynthesis and yield in tea. Fotosíntesis en el té
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Claims 13
Claim · model-written summary
Irrigation increased tea photosynthetic rate per unit leaf area.
- Taxon
- teae1
- Material
- Clone 6/8e1
- Treatment
- Irrigatione0
- Outcome
- photosynthetic rate per unit leaf area (A)e0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Irrigation and fertilizer increased photosynthetic rate both by enhancing photosynthetic rate per unit leaf area (A) in healthy leaves”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer increased tea photosynthetic rate per unit leaf area.
- Taxon
- teae1
- Treatment
- fertilizere0
- Outcome
- photosynthetic rate per unit leaf area (A)e0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Irrigation and fertilizer increased photosynthetic rate both by enhancing photosynthetic rate per unit leaf area (A) in healthy leaves”
e1“tea Clone 6/8”
Claim · model-written summary
Irrigation increased the proportion of sunlight intercepted by efficient tea leaves.
- Taxon
- teae1
- Treatment
- Irrigatione0
- Outcome
- proportion of sunlight intercepted by photosynthetically efficient leavese0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“Irrigation and fertilizer increased photosynthetic rate both by enhancing photosynthetic rate per unit leaf area (A) in healthy leaves and by increasing the proportion of sunlight intercepted by photosynthetically efficient leaves.”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer increased the proportion of sunlight intercepted by efficient tea leaves.
- Taxon
- teae1
- Treatment
- fertilizere0
- Outcome
- proportion of sunlight intercepted by photosynthetically efficient leavese0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“Irrigation and fertilizer increased photosynthetic rate both by enhancing photosynthetic rate per unit leaf area (A) in healthy leaves and by increasing the proportion of sunlight intercepted by photosynthetically efficient leaves.”
e1“tea Clone 6/8”
Claim · model-written summary
Irrigation-related increases in leaf photosynthesis were accounted for by increased stomatal conductance and reduced leaf temperature.
Verbatim
e0“Irrigation-induced increases in A could be accounted for by increases in stomatal conductance (g) and associated reductions in leaf temperature.”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer at 225 kg N ha -1 increased tea leaf photosynthesis.
- Taxon
- teae1
- Treatment
- Fertilizer at an annual application rate of 225 kg N ha -1e0
- Outcome
- Ae0
- Direction
- increasese0
Not reportedComparator
Verbatim
e0“Fertilizer at an annual application rate of 225 kg N ha -1 caused increases in A associated with increases in g and improved responses to ambient CO 2 concentration and illuminance (photon flux density, PFD).”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer at 225 kg N ha -1 increased tea stomatal conductance.
- Taxon
- teae1
- Treatment
- Fertilizer at an annual application rate of 225 kg N ha -1e0
- Outcome
- ge0
- Direction
- increasese0
Not reportedComparator
Verbatim
e0“Fertilizer at an annual application rate of 225 kg N ha -1 caused increases in A associated with increases in g”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer at 225 kg N ha -1 improved tea photosynthetic responses to ambient CO2 and illuminance.
- Taxon
- teae1
- Treatment
- Fertilizer at an annual application rate of 225 kg N ha -1e0
- Outcome
- responses to ambient CO 2 concentration and illuminancee0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“Fertilizer at an annual application rate of 225 kg N ha -1 caused increases in A associated with increases in g and improved responses to ambient CO 2 concentration and illuminance (photon flux density, PFD).”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer at 375 kg N ha -1 a -1 decreased tea leaf photosynthesis despite increasing conductance.
- Taxon
- teae1
- Treatment
- fertilizer application rate to 375 kg N ha -1 a -1e0
- Outcome
- Ae0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“a further increase in fertilizer application rate to 375 kg N ha -1 a -1 decreased A in spite of increasing g.”
e1“tea Clone 6/8”
Claim · model-written summary
Fertilizer at 375 kg N ha -1 a -1 increased tea stomatal conductance.
- Taxon
- teae1
- Treatment
- fertilizer application rate to 375 kg N ha -1 a -1e0
- Outcome
- ge0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“a further increase in fertilizer application rate to 375 kg N ha -1 a -1 decreased A in spite of increasing g.”
e1“tea Clone 6/8”
Claim · model-written summary
Light saturation of tea photosynthesis occurred only at the higher fertilizer rate.
Verbatim
e0“Light-saturation of photosynthesis occurred only at the higher fertilizer application rate.”
e1“tea Clone 6/8”
Claim · model-written summary
At photon flux density of 1400 to 2000 μmol m -2 s -l, leaf photosynthesis decreased in unfertilized tea.
Verbatim
e0“In unfertilized tea or tea fertilized at the lower rate, A decreased at a PFD of between 1400 and 2000 μmol m -2 s -l .”
Claim · model-written summary
At photon flux density of 1400 to 2000 μmol m -2 s -l, leaf photosynthesis decreased in tea given lower fertilizer.
Verbatim
e0“In unfertilized tea or tea fertilized at the lower rate, A decreased at a PFD of between 1400 and 2000 μmol m -2 s -l .”
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See all 13 papers →fertilization · molecular: metabolites · Camellia sinensis (black tea)Positive and negative results
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See all 18 papers →irrigation · physiology: photosynthesis · Camellia sinensis (black tea)Results agree
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- positive
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fertilization · physiology: photosynthesis · Camellia sinensis (black tea)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.