Abstract
Summary The root elongation rate represents a biophysical process that can be directly affected by mechanical, water, thermal, and gaseous stresses in the soil to be used as a soil physical quality indicator. The objective of this study was to determine sugarcane root growth parameters under soil physical stress for different root diameter classes in an Oxisol from the Southeast of Brazil. The experimental design was entirely randomized in a factorial scheme 5 × 2 (mechanical × water stress) with three replications. The factor mechanical stress was composed of five compaction levels (1.04; 1.12; 1.19; 1.28; 1.36 Mg m – 3 ). The factor water stress was composed of two matric potentials (–6 kPa and –33 kPa). Soil samples were collected from the 0.0–0.2 m layer of an Oxisol with a clayey texture. Pre-sprouted sugarcane seedlings were transplanted and conditioned in a growth chamber. Root length, volume, surface area, and diameter were quantified to generate root growth models as a function of physical stresses in the soil. Soil penetration resistance increases from 1.4 to 5 MPa reduced root elongation rate from 3.5 to 1.35 cm day –1 (–59%) and the average number of roots from 11 to 6 segments (–45%), respectively. The root volume, surface area, and length were reduced because of the increase in the compaction level. Coarse root diameter (1–2 mm) was weakly impacted by mechanical stress, whereas fine root diameter (0.5–1 mm) was more growth limited in compacted soils. The root elongation rate of sugarcane was modelled as a function of mechanical and water stress. Mechanical stress mainly affects the growth of sugarcane roots with small diameter.
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Claims 6
Claim · model-written summary
Soil penetration resistance increase reduced sugarcane root elongation rate by 59%.
- Taxon
- sugarcanet0
- Treatment
- Soil penetration resistance increases from 1.4 to 5 MPae1
- Outcome
- root elongation ratee1
- Direction
- reducede1
- Value
- 3.5 to 1.35 cm day –1 (–59%)e1
Not reportedComparator
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e1“Soil penetration resistance increases from 1.4 to 5 MPa reduced root elongation rate from 3.5 to 1.35 cm day –1 (–59%) and the average number of roots from 11 to 6 segments (–45%), respectively”
Claim · model-written summary
Soil penetration resistance increase reduced the average number of sugarcane roots by 45%.
- Taxon
- sugarcanet0
- Treatment
- Soil penetration resistance increases from 1.4 to 5 MPae1
- Outcome
- average number of rootse1
- Direction
- reducede1
- Value
- 11 to 6 segments (–45%)e1
Not reportedComparator
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e1“Soil penetration resistance increases from 1.4 to 5 MPa reduced root elongation rate from 3.5 to 1.35 cm day –1 (–59%) and the average number of roots from 11 to 6 segments (–45%), respectively”
Claim · model-written summary
Compaction reduced sugarcane root volume, surface area and length.
- Taxon
- sugarcanet0
- Treatment
- increase in the compaction levele2
- Outcome
- root volume, surface area, and lengthe2
- Direction
- reducede2
Not reportedComparator
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e2“The root volume, surface area, and length were reduced because of the increase in the compaction level”
Claim · model-written summary
Mechanical stress weakly impacted coarse sugarcane roots (1–2 mm diameter).
Not reportedComparator
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e3“Coarse root diameter (1–2 mm) was weakly impacted by mechanical stress”
Claim · model-written summary
Fine sugarcane roots (0.5–1 mm diameter) were more growth limited in compacted soils.
- Taxon
- sugarcanet0
- Organ / stage
- fine root diameter (0.5–1 mm)e4
- Treatment
- compacted soilse4
- Outcome
- growthe4
- Direction
- more growth limitede4
Not reportedComparator
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e4“fine root diameter (0.5–1 mm) was more growth limited in compacted soils”
Claim · model-written summary
Sugarcane root elongation rate was modelled as a function of mechanical and water stress.
Not reportedDirection
Verbatim
t0“Modelling sugarcane root elongation in response to mechanical stress”
e5“The root elongation rate of sugarcane was modelled as a function of mechanical and water stress”
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