Abstract
Diurnal and day-to-day fluctuations in the concentrations of mineral nutrients in the leaves of spinach were investigated by successive sampling of the pot-grown plants.1. As for diurnal fluctuations, the concentrations of N, P, K and Mg on a dry weight basis decreased after sunrise and reached a minimum in the late afternoon. They increased thereafter and reached a maximum at dawn.2. The concentrations of N and Mg as % fresh weight and of K as % tissue water increased in the daytime and decreased at night.3. Regarding day-to-day fluctuations, the concentrations of P and K as % dry weight continued to decrease over 3 days immediately after rainy days in the leaves sampled either at dawn or in the afternoon.4. The concentrations of N, Ca and Mg as % fresh weight and of K as % tissue water were constant in the leaves sampled at dawn, except on the day immediately after rainy days. In the leaves sampled in the afternoon, those were constant even after rainy days.5. After the number of leaves ceased to increase due to low temperature, the concentrations of N, P and K as % dry weight decreased but those of N, Ca and Mg as % fresh weight and that of K as % tissue water increased.6. No diurnal nor day-to-day fluctuations were found in the concentration of P on a fresh weight basis.
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Claims 9
Claim · model-written summary
Leaf N, P, K and Mg concentrations on a dry weight basis fell after sunrise to an afternoon minimum.
- Taxon
- Spinach
Spinacia oleraceat0 - Organ / stage
- Leavest0
- Outcome
- concentrations of N, P, K and Mg on a dry weight basise0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of N, P, K and Mg on a dry weight basis decreased after sunrise and reached a minimum in the late afternoon”
t0“Spinach Leaves”
Claim · model-written summary
The same dry weight mineral concentrations rose to a dawn maximum.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of N, P, K and Mg on a dry weight basise1
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They increased thereafter and reached a maximum at dawn”
e1“the concentrations of N, P, K and Mg on a dry weight basis decreased after sunrise”
t0“Spinach Leaves”
Claim · model-written summary
N and Mg fresh weight concentrations and K tissue water concentration increased in daytime and decreased at night.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of N and Mg as % fresh weight and of K as % tissue watere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentrations of N and Mg as % fresh weight and of K as % tissue water increased in the daytime and decreased at night.”
t0“Spinach Leaves”
Claim · model-written summary
P and K dry weight concentrations declined for three days after rain.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of P and K as % dry weighte0
- Direction
- decreasee0
- Qualifier
- over 3 days immediately after rainy dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of P and K as % dry weight continued to decrease over 3 days immediately after rainy days”
t0“Spinach Leaves”
Claim · model-written summary
At dawn N, Ca and Mg fresh weight and K tissue water concentrations remained constant except immediately after rain.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of N, Ca and Mg as % fresh weight and of K as % tissue watere0
- Direction
- constante0
- Qualifier
- except on the day immediately after rainy dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentrations of N, Ca and Mg as % fresh weight and of K as % tissue water were constant in the leaves sampled at dawn, except on the day immediately after rainy days.”
t0“Spinach Leaves”
Claim · model-written summary
In afternoon samples those fresh weight and tissue water concentrations were constant even after rainy days.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of N, Ca and Mg as % fresh weight and of K as % tissue watere1
- Direction
- constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the leaves sampled in the afternoon, those were constant even after rainy days.”
e1“The concentrations of N, Ca and Mg as % fresh weight and of K as % tissue water”
t0“Spinach Leaves”
Claim · model-written summary
After leaf number stopped increasing in low temperature, dry weight N, P and K concentrations decreased.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentrations of N, P and K as % dry weighte0
- Direction
- decreasede0
- Qualifier
- low temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the number of leaves ceased to increase due to low temperature, the concentrations of N, P and K as % dry weight decreased”
t0“Spinach Leaves”
Claim · model-written summary
After leaf number stopped increasing, fresh weight N, Ca, Mg and tissue water K concentrations increased.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- N, Ca and Mg as % fresh weight and that of K as % tissue watere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of N, Ca and Mg as % fresh weight and that of K as % tissue water increased”
t0“Spinach Leaves”
Claim · model-written summary
P fresh weight concentration had no diurnal or day-to-day fluctuation.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- concentration of P on a fresh weight basise0
- Direction
- No diurnal nor day-to-day fluctuationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No diurnal nor day-to-day fluctuations were found in the concentration of P on a fresh weight basis.”
t0“Spinach Leaves”