Abstract
In the tropics, broadcast seeded flooded rice (BSFR) was found to show a higher 15N recovery than transplanted rice (TPR) under the same fertilizer N management conditions mainly due to the higher initial growth rate at early stages as a result of the lack of transplanting shock.This study was conducted to compare the growth characteristics and 15N recovery at early growth stages between BSFR and TPR under conventional and delayed (low and high temperatures) planting environment in Japan.Under both planting environments, BSFR produced a larger number of tillers m-2 (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS).However, TPR showed a larger crop dry weight accumulation at either planting time resulting in a higher total plant N uptake.Irrespective of the cropping method and time, dry weight was exponentially correlated with the plant uptake while 15N recovery showed a curvilinear relation to the N uptake.Under conventional planting, TPR showed a higher basal 15N recovery (ranging from 23-28%) than BSFR (13-16%) in 1996 while the values were 24-26% for TPR and 14-23% for BSFR in 1997 during the maximum tiller (60-69 DAS) to panicle formation stages (85-89 DAS).Under delayed planting, still TPR showed a higher average basal 15N recovery (28%) than BSFR (23%) at the same stages as those mentioned above.These results suggest that regardless of planting time in Japan, TPR exhibited a higher initial growth rate than BSFR resulting in higher use efficiency of both soil and fertilizer N at the early growth stages.Key Words: broadcast-seeded flooded rice
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Claims 10
Claim · model-written summary
BSFR had more tillers than TPR at 89 days.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- middle growth stagee0
- Treatment
- BSFRe0
- Outcome
- number of tillers m-2e0
- Direction
- largere0
- Value
- 600-700e0
- Comparator
- TPRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BSFR produced a larger number of tillers m-2 (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS)”
t0“rice”
Claim · model-written summary
TPR had greater crop dry weight accumulation at either planting time.
- Taxon
- riceOryza sativat0
- Treatment
- TPRe0
- Outcome
- crop dry weight accumulatione0
- Direction
- largere0
- Qualifier
- at either planting timee0
- Comparator
- BSFRe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TPR showed a larger crop dry weight accumulation at either planting time resulting in a higher total plant N uptake”
t0“rice”
e1“BSFR produced a larger number of tillers m-2 (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS)”
Claim · model-written summary
TPR had higher total plant N uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TPR showed a larger crop dry weight accumulation at either planting time resulting in a higher total plant N uptake”
t0“rice”
e1“BSFR produced a larger number of tillers m-2 (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS)”
Claim · model-written summary
Dry weight was exponentially correlated with plant uptake.
- Taxon
- riceOryza sativat0
- Organ / stage
- plante0
- Outcome
- dry weighte0
- Qualifier
- exponentially correlated with the plant uptakee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrespective of the cropping method and time, dry weight was exponentially correlated with the plant uptake”
t0“rice”
Claim · model-written summary
15N recovery had a curvilinear relation to N uptake.
- Taxon
- riceOryza sativat0
- Treatment
- N uptakee0
- Outcome
- 15N recoverye0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15N recovery showed a curvilinear relation to the N uptake”
t0“rice”
Claim · model-written summary
TPR had higher basal 15N recovery than BSFR in 1996.
- Taxon
- riceOryza sativat0
- Treatment
- TPRe0
- Outcome
- basal 15N recoverye0
- Direction
- highere0
- Value
- 23-28%e0
- Qualifier
- 13-16%e0
- Comparator
- BSFRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TPR showed a higher basal 15N recovery (ranging from 23-28%) than BSFR (13-16%) in 1996”
t0“rice”
Claim · model-written summary
In 1997 TPR basal recovery was 24-26% versus 14-23% for BSFR.
- Taxon
- riceOryza sativat0
- Treatment
- TPRe0
- Outcome
- basal 15N recoverye1
- Value
- 24-26%e0
- Qualifier
- 14-23%e0
- Comparator
- BSFRe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the values were 24-26% for TPR and 14-23% for BSFR in 1997”
t0“rice”
e1“TPR showed a higher basal 15N recovery (ranging from 23-28%) than BSFR (13-16%) in 1996”
Claim · model-written summary
Under delayed planting TPR had higher average basal recovery than BSFR.
- Taxon
- riceOryza sativat0
- Treatment
- TPRe0
- Outcome
- average basal 15N recoverye0
- Direction
- highere0
- Value
- 28%e0
- Qualifier
- 23%e0
- Comparator
- BSFRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under delayed planting, still TPR showed a higher average basal 15N recovery (28%) than BSFR (23%)”
t0“rice”
Claim · model-written summary
The authors inferred higher initial growth rate in TPR.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TPR exhibited a higher initial growth rate than BSFR”
t0“rice”
Claim · model-written summary
The authors inferred higher soil and fertilizer nitrogen use efficiency in TPR.
- Taxon
- riceOryza sativat0
- Treatment
- TPRe1
- Outcome
- use efficiency of both soil and fertilizer Ne0
- Direction
- highere0
- Comparator
- BSFRe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher use efficiency of both soil and fertilizer N at the early growth stages”
t0“rice”
e1“BSFR produced a larger number of tillers m-2 (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS)”
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