Abstract
Sweet sorghum (Sorghum bicolor L. Moench) has significant cultivation potential in arid and saline–alkaline regions due to its drought and salt tolerance. This study aims to evaluate the mechanisms by which increased soil salinity and reduced irrigation affect the growth, aboveground biomass, and stem sugar content of sweet sorghum. A two-year field experiment was conducted, with four salinity levels (CK: 4.17 dS/m, S1: 5.83 dS/m, S2: 7.50 dS/m, and S3: 9.17 dS/m) and three irrigation levels (W1: 90 mm, W2: 70 mm, and W3: 50 mm). The results showed that increased salinity and reduced irrigation significantly reduced both the emergence rate and aboveground biomass, with the decreases in the emergence rate ranging from 11.0% to 36.2% and the reductions in the aboveground biomass ranging from 15.9% to 43.8%. Additionally, increased soil salinity led to reductions in stem sugar content of 6.3% (S1), 8.8% (S2), and 12.8% (S3), respectively. The results also indicated that photosynthetic efficiency, including the net photosynthetic rate (Pn), stomatal conductance (Gs), and chlorophyll content (SPAD), was significantly hindered under increased water and salt stress, with the Pn decreasing by up to 50.4% and the SPAD values decreasing by up to 36.3% under the highest stress conditions. These findings underscore the adverse impacts of increased soil salinity and reduced irrigation on sweet sorghum’s growth, photosynthetic performance, and sugar accumulation, offering critical insights for optimizing its cultivation in arid and saline environments.
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Claims 8
Claim · model-written summary
Increased salinity and reduced irrigation significantly reduced sweet sorghum emergence rate by 11.0% to 36.2%.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased salinity and reduced irrigatione0
- Outcome
- emergence ratee0
- Direction
- reducede0
- Value
- 11.0% to 36.2%e0
Not reportedComparator
Verbatim
e0“increased salinity and reduced irrigation significantly reduced both the emergence rate and aboveground biomass, with the decreases in the emergence rate ranging from 11.0% to 36.2% and the reductions in the aboveground biomass ranging from 15.9% to 43.8%”
t0“Sweet Sorghum”
Claim · model-written summary
Increased salinity and reduced irrigation significantly reduced aboveground biomass of sweet sorghum by 15.9% to 43.8%.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased salinity and reduced irrigatione0
- Outcome
- aboveground biomasse0
- Direction
- reducede0
- Value
- 15.9% to 43.8%e0
Not reportedComparator
Verbatim
e0“increased salinity and reduced irrigation significantly reduced both the emergence rate and aboveground biomass, with the decreases in the emergence rate ranging from 11.0% to 36.2% and the reductions in the aboveground biomass ranging from 15.9% to 43.8%”
t0“Sweet Sorghum”
Claim · model-written summary
Increased soil salinity S1 reduced stem sugar content by 6.3%.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased soil salinitye0
- Outcome
- stem sugar contente0
- Direction
- reductionse0
- Value
- 6.3%e0
- Qualifier
- S1e0
Not reportedComparator
Verbatim
e0“increased soil salinity led to reductions in stem sugar content of 6.3% (S1), 8.8% (S2), and 12.8% (S3)”
t0“Sweet Sorghum”
Claim · model-written summary
Increased soil salinity S2 reduced stem sugar content by 8.8%.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased soil salinitye0
- Outcome
- stem sugar contente0
- Direction
- reductionse0
- Value
- 8.8%e0
- Qualifier
- S2e0
Not reportedComparator
Verbatim
e0“increased soil salinity led to reductions in stem sugar content of 6.3% (S1), 8.8% (S2), and 12.8% (S3)”
t0“Sweet Sorghum”
Claim · model-written summary
Increased soil salinity S3 reduced stem sugar content by 12.8%.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased soil salinitye0
- Outcome
- stem sugar contente0
- Direction
- reductionse0
- Value
- 12.8%e0
- Qualifier
- S3e0
Not reportedComparator
Verbatim
e0“increased soil salinity led to reductions in stem sugar content of 6.3% (S1), 8.8% (S2), and 12.8% (S3)”
t0“Sweet Sorghum”
Claim · model-written summary
Net photosynthetic rate decreased by up to 50.4% under the highest water and salt stress.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased water and salt stresse0
- Outcome
- Pne0
- Direction
- decreasinge0
- Value
- 50.4%e0
Not reportedComparator
Verbatim
e0“photosynthetic efficiency, including the net photosynthetic rate (Pn), stomatal conductance (Gs), and chlorophyll content (SPAD), was significantly hindered under increased water and salt stress, with the Pn decreasing by up to 50.4% and the SPAD values decreasing by up to 36.3% under the highest stress conditions”
t0“Sweet Sorghum”
Claim · model-written summary
Chlorophyll content (SPAD) decreased by up to 36.3% under the highest water and salt stress.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased water and salt stresse0
- Outcome
- SPAD valuese0
- Direction
- decreasinge0
- Value
- 36.3%e0
Not reportedComparator
Verbatim
e0“photosynthetic efficiency, including the net photosynthetic rate (Pn), stomatal conductance (Gs), and chlorophyll content (SPAD), was significantly hindered under increased water and salt stress, with the Pn decreasing by up to 50.4% and the SPAD values decreasing by up to 36.3% under the highest stress conditions”
t0“Sweet Sorghum”
Claim · model-written summary
Stomatal conductance was significantly hindered under increased water and salt stress.
- Taxon
- Sweet Sorghumt0
- Treatment
- increased water and salt stresse0
- Outcome
- stomatal conductance (Gs)e0
- Direction
- hinderede0
Not reportedComparator
Verbatim
e0“photosynthetic efficiency, including the net photosynthetic rate (Pn), stomatal conductance (Gs), and chlorophyll content (SPAD), was significantly hindered under increased water and salt stress, with the Pn decreasing by up to 50.4% and the SPAD values decreasing by up to 36.3% under the highest stress conditions”
t0“Sweet Sorghum”
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