Abstract
Nondestructive assessment of water content and water stress in plants is an important component in the rational use of crop irrigation management in precision agriculture. Spectral measurements of light reflectance in the UV/VIS/NIR region (350–1075 nm) from individual leaves were acquired under a rapid dehydration protocol for validation of the remote sensing water content assessment in soybean plants. Four gravimetrical approaches of leaf water content assessment were used: relative water content (RWC), foliar water content as percent of total fresh mass (FWCt), foliar water content as percent of dry mass (FWCd), and equivalent water thickness (EWT). Leaf desiccation resulted in changes in optical properties with increasing relative reflectance at wavelengths between 580 and 700 nm. The highest positive correlations were observed for the relations between the photochemical reflectance index (PRI) and EWT (rP = 0.860). Data analysis revealed that the specific water absorption band at 970 nm showed relatively weaker sensitivity to water content parameters. The prediction of leaf water content parameters from PRI measurements was better with RMSEs of 12.4% (rP = 0.786), 9.1% (rP = 0.736), and 0.002 (rP = 0.860) for RWC, FWCt, and EWT (p < 0.001), respectively. The results may contribute to more efficient crop water management and confirmed that EWT has a statistically closer relationship with reflectance indices than other monitored water parameters.
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Claims 7
Claim · model-written summary
Leaf desiccation increased relative reflectance at wavelengths between 580 and 700 nm in soybean leaves.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Leaf desiccatione0
- Outcome
- relative reflectancee0
- Direction
- increasinge0
- Qualifier
- wavelengths between 580 and 700 nme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Leaf desiccation resulted in changes in optical properties with increasing relative reflectance at wavelengths between 580 and 700 nm”
Claim · model-written summary
The highest positive correlation was between the photochemical reflectance index and EWT (rP = 0.860).
- Taxon
- SoybeanGlycine maxt0
- Outcome
- photochemical reflectance index (PRI)e0
- Direction
- positivee0
- Value
- rP = 0.860e0
- Comparator
- EWTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The highest positive correlations were observed for the relations between the photochemical reflectance index (PRI) and EWT (rP = 0.860)”
Claim · model-written summary
The water absorption band at 970 nm showed relatively weaker sensitivity to water content parameters.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- sensitivity to water content parameterse0
- Direction
- weakere0
- Qualifier
- water absorption band at 970 nme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“the specific water absorption band at 970 nm showed relatively weaker sensitivity to water content parameters”
Claim · model-written summary
Prediction of relative water content from PRI had an RMSE of 12.4% (rP = 0.786).
- Taxon
- SoybeanGlycine maxt0
- Outcome
- RWCe0
- Value
- 12.4%e0
- Qualifier
- rP = 0.786e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“RMSEs of 12.4% (rP = 0.786), 9.1% (rP = 0.736), and 0.002 (rP = 0.860) for RWC, FWCt, and EWT”
Claim · model-written summary
Prediction of FWCt from PRI had an RMSE of 9.1% (rP = 0.736).
- Taxon
- SoybeanGlycine maxt0
- Outcome
- FWCte0
- Value
- 9.1%e0
- Qualifier
- rP = 0.736e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“RMSEs of 12.4% (rP = 0.786), 9.1% (rP = 0.736), and 0.002 (rP = 0.860) for RWC, FWCt, and EWT”
Claim · model-written summary
Prediction of EWT from PRI had an RMSE of 0.002 (rP = 0.860).
- Taxon
- SoybeanGlycine maxt0
- Outcome
- EWTe0
- Value
- 0.002e0
- Qualifier
- rP = 0.860e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“RMSEs of 12.4% (rP = 0.786), 9.1% (rP = 0.736), and 0.002 (rP = 0.860) for RWC, FWCt, and EWT”
Claim · model-written summary
EWT has a statistically closer relationship with reflectance indices than the other monitored water parameters.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- EWTe0
- Outcome
- relationship with reflectance indicese0
- Direction
- closere0
- Comparator
- other monitored water parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“EWT has a statistically closer relationship with reflectance indices than other monitored water parameters”