Abstract
SUMMARY The relation between soil mechanical impedance as a result of soil drying, and root system growth (mass and length density) of rice was investigated in greenhouse and field studies. In a greenhouse experiment, soil drying for 16 days increased mechanical impedance in the 0–20 cm soil layer from near 0 to 2.5 MPa, and decreased root growth by 47% compared to the continuously flooded control. Root length density decreased with decreasing soil moisture and increasing soil mechanical impedance. In a lowland field experiment using a sprinkler irrigation gradient treatment for 19 days during the vegetative growth stage, soil mechanical impedance as low as 0.01 MPa inhibited root growth while values greater than 0.3–0.5 MPa decreased root growth and extension by 75%. The relative loss of potential root growth was continued after reflooding. Root length density, measured at flowering, was linearly related to yield.
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Claims 7
Claim · model-written summary
Soil drying for 16 days increased soil mechanical impedance in rice greenhouse experiments from near 0 to 2.5 MPa.
- Taxon
- rice
Oryza sativat0 - Treatment
- soil drying for 16 dayse1
- Outcome
- mechanical impedancee1
- Direction
- increasede1
- Value
- 2.5 MPae1
- Setting
- greenhouse experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e1“In a greenhouse experiment, soil drying for 16 days increased mechanical impedance in the 0–20 cm soil layer from near 0 to 2.5 MPa, and decreased root growth by 47% compared to the continuously flooded control”
Claim · model-written summary
Soil drying for 16 days decreased rice root growth by 47% compared to the continuously flooded control in a greenhouse experiment.
- Taxon
- riceOryza sativat0
- Treatment
- soil drying for 16 dayse1
- Outcome
- root growthe1
- Direction
- decreasede1
- Value
- 47%e1
- Comparator
- continuously flooded controle1
- Setting
- greenhouse experimente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e1“In a greenhouse experiment, soil drying for 16 days increased mechanical impedance in the 0–20 cm soil layer from near 0 to 2.5 MPa, and decreased root growth by 47% compared to the continuously flooded control”
Claim · model-written summary
Rice root length density decreased with decreasing soil moisture.
- Taxon
- riceOryza sativat0
- Treatment
- decreasing soil moisturee2
- Outcome
- Root length densitye2
- Direction
- decreasede2
- Qualifier
- increasing soil mechanical impedancee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e2“Root length density decreased with decreasing soil moisture and increasing soil mechanical impedance”
Claim · model-written summary
Soil mechanical impedance as low as 0.01 MPa inhibited rice root growth in a lowland field gradient treatment.
- Taxon
- riceOryza sativat0
- Organ / stage
- vegetative growth stagee3
- Treatment
- sprinkler irrigation gradient treatment for 19 dayse3
- Outcome
- root growthe3
- Direction
- inhibitede3
- Qualifier
- soil mechanical impedance as low as 0.01 MPae3
- Setting
- lowland field experimente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e3“In a lowland field experiment using a sprinkler irrigation gradient treatment for 19 days during the vegetative growth stage, soil mechanical impedance as low as 0.01 MPa inhibited root growth while values greater than 0.3–0.5 MPa decreased root growth and extension by 75%”
Claim · model-written summary
Soil mechanical impedance above 0.3–0.5 MPa decreased rice root growth and extension by 75% in a lowland field gradient treatment.
- Taxon
- riceOryza sativat0
- Treatment
- sprinkler irrigation gradient treatment for 19 dayse3
- Outcome
- root growth and extensione3
- Direction
- decreasede3
- Value
- 75%e3
- Qualifier
- values greater than 0.3–0.5 MPae3
- Setting
- lowland field experimente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e3“In a lowland field experiment using a sprinkler irrigation gradient treatment for 19 days during the vegetative growth stage, soil mechanical impedance as low as 0.01 MPa inhibited root growth while values greater than 0.3–0.5 MPa decreased root growth and extension by 75%”
Claim · model-written summary
The relative loss of potential rice root growth continued after reflooding.
- Taxon
- riceOryza sativat0
- Outcome
- relative loss of potential root growthe5
- Qualifier
- continued after refloodinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e4“In a lowland field experiment using a sprinkler irrigation gradient treatment for 19 days during the vegetative growth stage, soil mechanical impedance as low as 0.01 MPa inhibited root growth while values greater than 0.3–0.5 MPa decreased root growth and extension by 75%”
e5“The relative loss of potential root growth was continued after reflooding”
Claim · model-written summary
Rice root length density measured at flowering was linearly related to yield.
- Taxon
- riceOryza sativat0
- Organ / stage
- floweringe6
- Outcome
- yielde6
- Qualifier
- Root length densitye6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice”
e6“Root length density, measured at flowering, was linearly related to yield”
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