Abstract
Changes in root development and growth in upland rice receiving subsurface irrigation were evaluated using root box experiments. Irrigated water was independently applied every day to depths of 0, 5, 10 and 20 cm from the ground surface, and root morphology and aboveground growth were determined after 2 weeks of treatment. Plant length, stem number and leaf age significantly increased along with the irrigation depth, and the aboveground dry weights of rice grown at 5-, 10- and 20-cm depths were significantly greater than those grown at 0 cm. Root surface area significantly increased along with the irrigation depth, which was attributed to the increasing lengths and branch numbers of roots. Subsurface irrigation significantly increased root lengths in deep layers (below 15 cm) and increased the deep layers’ distribution ratios by 1.2 to 5.7 times as the surface layer ratio decreased. This was accompanied with a decrease in the root diameter. This may be associated with the increase in the numbers of branches and the decrease in the numbers of thick nodal roots. These results indicate that subsurface irrigation increases root length and branching in the deep soil layers, inducing deep rooting, even with same amount of irrigation.
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Claims 9
Claim · model-written summary
Plant length, stem number and leaf age rose significantly with irrigation depth.
- Taxon
- upland rice NERICAt0
- Treatment
- irrigation depthe0
- Outcome
- Plant length, stem number and leaf agee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Plant length, stem number and leaf age significantly increased along with the irrigation depth”
t0“upland rice NERICA”
Claim · model-written summary
Aboveground dry weight at 5, 10 and 20 cm was significantly greater than at 0 cm.
Verbatim
e0“the aboveground dry weights of rice grown at 5-, 10- and 20-cm depths were significantly greater than those grown at 0 cm”
t0“upland rice NERICA”
Claim · model-written summary
Root surface area increased significantly with irrigation depth.
Not reportedComparator
Verbatim
e0“Root surface area significantly increased along with the irrigation depth”
t0“upland rice NERICA”
Claim · model-written summary
The increased root surface area was attributed to greater root length and branching.
Verbatim
e0“which was attributed to the increasing lengths and branch numbers of roots”
e1“Root surface area significantly increased”
t0“upland rice NERICA”
Claim · model-written summary
Subsurface irrigation significantly increased root length below 15 cm.
- Taxon
- upland rice NERICAt0
- Treatment
- Subsurface irrigatione0
- Outcome
- root lengthse0
- Direction
- increasede0
- Qualifier
- below 15 cme0
Not reportedComparator
Verbatim
e0“Subsurface irrigation significantly increased root lengths in deep layers (below 15 cm)”
t0“upland rice NERICA”
Claim · model-written summary
Subsurface irrigation increased deep-layer root distribution ratios by 1.2 to 5.7 times.
- Taxon
- upland rice NERICAt0
- Treatment
- Subsurface irrigatione1
- Outcome
- deep layers’ distribution ratiose0
- Direction
- increasede0
- Value
- 1.2 to 5.7 timese0
Not reportedComparator
Verbatim
e0“increased the deep layers’ distribution ratios by 1.2 to 5.7 times”
e1“Subsurface irrigation”
t0“upland rice NERICA”
Claim · model-written summary
The surface-layer root distribution ratio decreased.
- Taxon
- upland rice NERICAt0
- Treatment
- Subsurface irrigatione1
- Outcome
- surface layer ratioe0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“as the surface layer ratio decreased”
e1“Subsurface irrigation”
t0“upland rice NERICA”
Claim · model-written summary
Root diameter decreased with the shift toward deeper roots.
Not reportedComparator
Verbatim
e0“This was accompanied with a decrease in the root diameter”
e1“Subsurface irrigation”
t0“upland rice NERICA”
Claim · model-written summary
The decreased root diameter may relate to more branches and fewer thick nodal roots.
Verbatim
e0“This may be associated with the increase in the numbers of branches and the decrease in the numbers of thick nodal roots”
e1“decrease in the root diameter”
t0“upland rice NERICA”
The same questions in other papers
irrigation · growth · Oryza sativa (rice)Positive and negative results
221 papers in the same direction as this paper · 62 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
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See all 291 papers →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.