Abstract
Detailed information on the root system under drip irrigation will help in more efficient irrigation scheduling. Although input of previous crop residues is effective in increasing soil fertility, little is known about its effect on the root system. This study aimed to investigate the effects of irrigation methods (drip or flood) and different management of previous crop residues on root morphological characteristics and its distribution and physiological functions of the rice cultivar ‘Hinohikari’. Experiments were conducted in the paddy field on the university farm (input previous crop residues every year) for both drip and flood irrigation and the paddy and upland field (no input previous crop residues) on the campus of the faculty under flood and drip irrigation. Plant root was sampled with a core sampler (ø 5.5 cm × 30 cm), and root length and surface area were determined using image analysis. Drip irrigation did not change root length compared to flood irrigation, but the root system was heavier and individual root thickness tended to increase compared to flood irrigation. The root depth index was significantly deeper in drip irrigation than in flood irrigation. The bleeding rates were significantly higher in flood irrigation than in drip irrigation. Applying previous crop residues significantly improve root length mainly at the upper soil layers. The mechanisms for enhancing root growth by applying previous crop residues need to be explored individually in flood and drip irrigation, in which physical and chemical properties in soil are largely different.
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Claims 6
Claim · model-written summary
Drip irrigation did not change root length.
- Taxon
- rice
Oryza sativat0 - Material
- Hinohikarie1
- Treatment
- Drip irrigatione0
- Outcome
- root lengthe0
- Direction
- did not changee0
- Comparator
- flood irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“Drip irrigation did not change root length compared to flood irrigation, but the root system was heavier and individual root thickness tended to increase compared to flood irrigation.”
e1“rice cultivar ‘Hinohikari’”
Claim · model-written summary
Drip irrigation heavier root system.
- Taxon
- riceOryza sativat0
- Material
- Hinohikarie1
- Treatment
- Drip irrigatione0
- Outcome
- root systeme0
- Direction
- heaviere0
- Comparator
- flood irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“Drip irrigation did not change root length compared to flood irrigation, but the root system was heavier and individual root thickness tended to increase compared to flood irrigation.”
e1“rice cultivar ‘Hinohikari’”
Claim · model-written summary
Drip irrigation increase individual root thickness.
- Taxon
- riceOryza sativat0
- Material
- Hinohikarie1
- Treatment
- Drip irrigatione0
- Outcome
- individual root thicknesse0
- Direction
- increasee0
- Qualifier
- tended toe0
- Comparator
- flood irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“Drip irrigation did not change root length compared to flood irrigation, but the root system was heavier and individual root thickness tended to increase compared to flood irrigation.”
e1“rice cultivar ‘Hinohikari’”
Claim · model-written summary
drip irrigation deeper root depth index.
- Taxon
- riceOryza sativat0
- Material
- Hinohikarie1
- Treatment
- drip irrigatione0
- Outcome
- root depth indexe0
- Direction
- deepere0
- Comparator
- flood irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“The root depth index was significantly deeper in drip irrigation than in flood irrigation.”
e1“rice cultivar ‘Hinohikari’”
Claim · model-written summary
flood irrigation higher bleeding rates.
- Taxon
- riceOryza sativat0
- Material
- Hinohikarie1
- Treatment
- flood irrigatione0
- Outcome
- bleeding ratese0
- Direction
- highere0
- Comparator
- drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“The bleeding rates were significantly higher in flood irrigation than in drip irrigation.”
e1“rice cultivar ‘Hinohikari’”
Claim · model-written summary
Applying previous crop residues improve root length.
- Taxon
- riceOryza sativat0
- Material
- Hinohikarie1
- Treatment
- Applying previous crop residuese0
- Outcome
- root lengthe0
- Direction
- improvee0
- Qualifier
- mainly at the upper soil layerse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice root”
e0“Applying previous crop residues significantly improve root length mainly at the upper soil layers.”
e1“rice cultivar ‘Hinohikari’”
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