Abstract
Abstract Tomato plants ( Lycopersicon esculentum Mill. cv. Vedettos) were grown in growth chambers under two photosynthetic photon flux (PPF; 125 and 250 μmol·s −1 ·m −2 , high-pressure sodium lamps) conditions for 18 hr and four N fertilization regimes (5, 10, 15, and 20 meq·liter −1 ) to characterize the ratio of vegetative to reproductive growth. At the lower PPF, vegetative growth was limited and did not respond to N increments in the nutrient solution. At 125 μmol·s −1 ·m −2 , maximum yields were obtained at the lowest N fertilization level. At 250 μmol·s −1 ·m −2 , maximum leaf dry weight and yields were obtained at intermediate N fertilization levels (10 and 15 meq·liter −1 ). Light levels did not alter the nitrate content of stem sap (but high PPF resulted in nitrate accumulation in leaves) but, at low PPF, nitrate accumulated in leaves at 20 meq N/liter. Nitrate in stem sap varied only slightly with N increments in the nutrient solution. The ratio of fruit fresh weight to leaf fresh weight decreased as N increased in the nutrient solution.
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Claims 9
Claim · model-written summary
At lower PPF, vegetative growth was limited and did not respond to nitrogen increments.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- N incrementse0
- Outcome
- vegetative growthe0
- Direction
- did not responde0
- Qualifier
- lower PPFe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the lower PPF, vegetative growth was limited and did not respond to N increments in the nutrient solution.”
t0“Tomato”
Claim · model-written summary
At 125 PPF, yield was maximal at the lowest nitrogen level.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- lowest N fertilization levele0
- Outcome
- yieldse0
- Direction
- maximume0
- Qualifier
- 125 μmol·s −1 ·m −2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 125 μmol·s −1 ·m −2 , maximum yields were obtained at the lowest N fertilization level.”
t0“Tomato”
Claim · model-written summary
At 250 PPF, leaf dry weight was maximal at intermediate nitrogen levels.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- intermediate N fertilization levels (10 and 15 meq·liter −1 )e0
- Outcome
- leaf dry weighte0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 250 μmol·s −1 ·m −2 , maximum leaf dry weight and yields were obtained at intermediate N fertilization levels (10 and 15 meq·liter −1 ).”
t0“Tomato”
Claim · model-written summary
At 250 PPF, yield was maximal at intermediate nitrogen levels.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- intermediate N fertilization levels (10 and 15 meq·liter −1 )e0
- Outcome
- yieldse0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 250 μmol·s −1 ·m −2 , maximum leaf dry weight and yields were obtained at intermediate N fertilization levels (10 and 15 meq·liter −1 ).”
t0“Tomato”
Claim · model-written summary
Light level did not alter stem sap nitrate content.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Light levelse0
- Outcome
- nitrate content of stem sape0
- Direction
- did not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light levels did not alter the nitrate content of stem sap”
t0“Tomato”
Claim · model-written summary
High PPF caused leaf nitrate accumulation.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- high PPFe0
- Outcome
- nitrate accumulation in leavese0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high PPF resulted in nitrate accumulation in leaves”
t0“Tomato”
Claim · model-written summary
At low PPF, leaf nitrate accumulated at 20 meq N/liter.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- 20 meq N/litere0
- Outcome
- nitrate accumulated in leavese0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low PPF, nitrate accumulated in leaves at 20 meq N/liter”
t0“Tomato”
Claim · model-written summary
Stem sap nitrate varied only slightly with nitrogen increments.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- N incrementse0
- Outcome
- Nitrate in stem sape0
- Qualifier
- only slightlye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate in stem sap varied only slightly with N increments in the nutrient solution.”
t0“Tomato”
Claim · model-written summary
The fruit to leaf fresh weight ratio declined as nutrient solution nitrogen increased.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Ne0
- Outcome
- ratio of fruit fresh weight to leaf fresh weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of fruit fresh weight to leaf fresh weight decreased as N increased in the nutrient solution.”
t0“Tomato”
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