Abstract
Knowledge of plant responses to soil water availability is essential for the development of effcient irrigation strategies.However,notably different results have been obtained in the past on the responses of various physiological indices for different plants to soil water availability.In this study,the responses of various plant processes to soil water availability were compared with data from pot and field plot experiments conducted on maize(Zea mays L.).Consistent results were obtained between pot and field plot experiments for the responses of various relative plant indices to changes in the fraction of available soil water(FASW).A threshold value,where the relative plant indices began to decrease with soil drying,and a lower water limit,where the decline of relative plant indices changed to a very slow rate,were found.Evaporative demand not only influenced the transpiration rate over a daily scale but also determined the difference in transpirational response to soil water availability among the transient,daily and seasonal time scales.At the seasonal scale,cumulative transpiration decreased linearly with soil drying,but the decrease of transpiration from FASW = 1 in response to water deficits did not affect dry weight until FASW = 0.75.On the other hand,the decrease in dry weight was comparable with plant height and leaf area.Therefore,the plant responses to soil water availability were notably different among various plant indices of maize and were influenced by the weather conditions.
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Claims 9
Claim · model-written summary
Cumulative seasonal transpiration of maize decreased linearly with soil drying.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“cumulative transpiration decreased linearly with soil drying”
Claim · model-written summary
Transpiration decrease from FASW 1 under water deficits did not affect maize dry weight until FASW 0.75.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“the decrease of transpiration from FASW = 1 in response to water deficits did not affect dry weight until FASW = 0.75”
Claim · model-written summary
Relative plant indices of maize began to decrease with soil drying above a threshold value.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“A threshold value,where the relative plant indices began to decrease with soil drying”
Claim · model-written summary
The decline of maize relative plant indices changed to a very slow rate below a lower water limit.
- Treatment
- soil dryinge1
- Outcome
- decline of relative plant indicese1
- Direction
- changed to a very slow ratee1
- Qualifier
- a lower water limite1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“A threshold value,where the relative plant indices began to decrease with soil drying,and a lower water limit,where the decline of relative plant indices changed to a very slow rate,were found”
Claim · model-written summary
Responses of maize relative plant indices to soil water fraction were consistent between pot and field plot experiments.
- Outcome
- responses of various relative plant indices to changes in the fraction of available soil watere1
- Setting
- pot and field plot experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“Consistent results were obtained between pot and field plot experiments for the responses of various relative plant indices to changes in the fraction of available soil water(FASW)”
Claim · model-written summary
Evaporative demand influenced the daily transpiration rate of maize.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“Evaporative demand not only influenced the transpiration rate over a daily scale”
Claim · model-written summary
Evaporative demand determined differences in transpirational response to soil water availability among transient, daily and seasonal time scales.
- Treatment
- soil water availabilitye1
- Outcome
- transpirational responsee1
- Qualifier
- transient,daily and seasonal time scalese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“determined the difference in transpirational response to soil water availability among the transient,daily and seasonal time scales”
Claim · model-written summary
The decrease in maize dry weight was comparable with the decrease in plant height and leaf area.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“the decrease in dry weight was comparable with plant height and leaf area”
Claim · model-written summary
Responses of maize plant indices to soil water availability were notably different among indices and influenced by weather conditions.
- Treatment
- soil water availabilitye1
- Outcome
- plant responses to soil water availabilitye1
- Qualifier
- influenced by the weather conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize(Zea mays)”
e1“the plant responses to soil water availability were notably different among various plant indices of maize and were influenced by the weather conditions”