Abstract
Abstract There might be a benefit in using sawdust for replacing rockwool in terms of reducing substrate costs while maintaining an adequate productivity and root growth. However, recent research showed that water availability and transfers in sawdust were limited, thereby increasing water stress during active plant growth. To lessen this risk, the objective of this study was to characterize the relationship of substrate matric potential with volumetric water content and dielectric (TDR) sensor in a range of soilless substrates moisture that could be observed in greenhouses. In addition, we investigated whether TDR, load cell, tensiometer and canopy temperature could accurately sense plant water stress and monitor and control irrigation scheduling for tomato plants grown in sawdust based substrates. Thus, equipments were installed in three substrates (1rockwool, 2pure sawdust, and 370% sawdust + 30% wood fibers) for the production of greenhouse tomato grown on raised-gutters with supplemental lighting. Under different solar radiation in winter and spring, and different water contents of the growing media, we measured gas exchanges, Chl a fluorescence and leaf water potential. We also measured plant growth and productivity during the whole growing seasons. For sawdust + wood fiber substrate, results showed significant correlations between TDR, load cell, and tensiometer. Matric potentials were generally correlated to TDR and load cell of sawdust and rockwool substrates. The canopy temperature was a poor indicator of the matric potential but a good indicator of the substrate water content during spring. Regardless of the growing season, TDR and load cell measurements were correlated to CO2 assimilation rate and Fv/Fm ratio of plant grown in sawdust based substrates and rockwool. However, relationships between water content measurements, matric potential, and physiological parameters varied with the growing media and season. No significant differences were observed for the plant development, leaf area, plant dry weight, carbohydrate partitioning and yield of tomato plants grown under different growing media.
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Claims 10
Claim · model-written summary
TDR, load cell, and tensiometer measurements were significantly correlated in sawdust plus wood fiber substrate.
- Taxon
- TOMATO
Solanum lycopersicumt0 - Outcome
- significant correlations between TDR, load cell, and tensiometere0
- Setting
- sawdust + wood fiber substratee0
Not reportedMaterialDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“For sawdust + wood fiber substrate, results showed significant correlations between TDR, load cell, and tensiometer”
Claim · model-written summary
Matric potential generally correlated with TDR and load cell readings in sawdust and rockwool substrates.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- Matric potentialse0
- Setting
- sawdust and rockwool substratese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“Matric potentials were generally correlated to TDR and load cell of sawdust and rockwool substrates”
Claim · model-written summary
Canopy temperature was a poor indicator of matric potential.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- matric potentiale0
- Comparator
- poor indicatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“The canopy temperature was a poor indicator of the matric potential but a good indicator of the substrate water content during spring”
Claim · model-written summary
Canopy temperature was a good indicator of substrate water content during spring.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- substrate water contente0
- Qualifier
- during springe0
- Comparator
- good indicatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“The canopy temperature was a poor indicator of the matric potential but a good indicator of the substrate water content during spring”
Claim · model-written summary
TDR and load cell measurements correlated with tomato CO2 assimilation rate across growing seasons and media.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- CO2 assimilation ratee0
- Setting
- sawdust based substrates and rockwoole0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“Regardless of the growing season, TDR and load cell measurements were correlated to CO2 assimilation rate and Fv/Fm ratio of plant grown in sawdust based substrates and rockwool”
Claim · model-written summary
TDR and load cell measurements correlated with tomato Fv/Fm ratio across growing seasons and media.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- Fv/Fm ratioe0
- Setting
- sawdust based substrates and rockwoole0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“Regardless of the growing season, TDR and load cell measurements were correlated to CO2 assimilation rate and Fv/Fm ratio of plant grown in sawdust based substrates and rockwool”
Claim · model-written summary
Relationships among water content, matric potential, and physiological measures varied by growing medium and season.
- Taxon
- TOMATOSolanum lycopersicumt0
- Outcome
- relationships between water content measurements, matric potential, and physiological parameterse0
- Qualifier
- varied with the growing media and seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“TOMATO PLANTS”
e0“relationships between water content measurements, matric potential, and physiological parameters varied with the growing media and season”
Claim · model-written summary
Tomato development, leaf area, and plant dry weight did not differ significantly across growing media.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- different growing mediae0
- Outcome
- plant development, leaf area, plant dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences were observed for the plant development, leaf area, plant dry weight, carbohydrate partitioning and yield of tomato plants grown under different growing media”
Claim · model-written summary
Tomato carbohydrate partitioning did not differ significantly across growing media.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- different growing mediae0
- Outcome
- carbohydrate partitioninge0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences were observed for the plant development, leaf area, plant dry weight, carbohydrate partitioning and yield of tomato plants grown under different growing media”
Claim · model-written summary
Tomato yield did not differ significantly across growing media.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- different growing mediae0
- Outcome
- yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences were observed for the plant development, leaf area, plant dry weight, carbohydrate partitioning and yield of tomato plants grown under different growing media”
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