Abstract
Water scarcity emerges as a prominent threat to the vegetative and reproductive phases of cotton plants. However, water deficit stress induces a reduction in stomatal conductance, altering the interplay between plant water and nutrients, and Irrigation water productivity (IWP). The relationship between IWP and cotton yield under deficit irrigation remains unclear in the irrigated area of Hyderabad, Sindh, Pakistan. The experiment was conducted at experimental stations of Agriculture Research Institute in Tandojam at two different sites during the cotton growing season 2022. The design of this study was based on a split-plot in RCBD including five deficit water stress levels (control treatment (existing irrigation practice 75 mm of water irrigation −1 ), 20% drought stress of existing irrigation, 20% drought stress of existing irrigation practice at alternate irrigation (even), 30% drought stress of existing irrigation practice and 20% drought stress of existing irrigation practice at alternate irrigation) and soil types. The findings revealed significant differences in soil moisture contents (SMCs) across all treatments, with a notable reduction in plant height and yield correlating with increased water stress. Despite variations in water stress and soil types affecting the number of opened bolls, the cotton yield and IWP demonstrated a decline, though not significantly under certain irrigation treatments. Across the deficit irrigation levels, 20% drought stress of existing irrigation practice at alternate irrigation (even) could significantly decrease yield by 6% and reduce IWP by 5% as compared to control treatment. However, the maximum IWP was recorded in the silt loam as compared to silt clay loam, respectively. The validation and calibration method of the CROPGROW-DSSAT model was designed to estimate cotton yield and IWP. The substantial R 2 value indicates a strong concordance between the model-calibrated and observed data, signifying the CROPGROW-DSSAT model’s ability to simulate cotton yield and WUE under deficit irrigation strategies within the specific regional climate conditions of Hyderabad. Therefore, it is suggested that the specific deficit irrigation strategies may maintain cotton yield production while reducing water usage, with variations observed between different soil types.
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Claims 9
Claim · model-written summary
Twenty percent drought stress at alternate irrigation could significantly decrease cotton yield by 6% compared with the control treatment.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- 20% drought stress of existing irrigation practice at alternate irrigation (even)e1
- Outcome
- yielde1
- Direction
- decreasee1
- Value
- 6%e1
- Qualifier
- coulde1
- Comparator
- control treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e1“20% drought stress of existing irrigation practice at alternate irrigation (even) could significantly decrease yield by 6% and reduce IWP by 5% as compared to control treatment”
Claim · model-written summary
Twenty percent drought stress at alternate irrigation could reduce irrigation water productivity by 5% compared with the control treatment.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 20% drought stress of existing irrigation practice at alternate irrigation (even)e1
- Outcome
- IWPe1
- Direction
- reducee1
- Value
- 5%e1
- Comparator
- control treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e1“20% drought stress of existing irrigation practice at alternate irrigation (even) could significantly decrease yield by 6% and reduce IWP by 5% as compared to control treatment”
Claim · model-written summary
The maximum irrigation water productivity was recorded in silt loam compared with silt clay loam.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- silt loame2
- Outcome
- IWPe2
- Direction
- maximume2
- Comparator
- silt clay loame2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e2“the maximum IWP was recorded in the silt loam as compared to silt clay loam”
Claim · model-written summary
Soil moisture contents differed significantly across all irrigation treatments.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- soil moisture contents (SMCs)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e3“The findings revealed significant differences in soil moisture contents (SMCs) across all treatments”
Claim · model-written summary
Plant height and yield were reduced as water stress increased.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- increased water stresse4
- Outcome
- plant height and yielde4
- Direction
- reductione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e4“a notable reduction in plant height and yield correlating with increased water stress”
Claim · model-written summary
The number of opened bolls was affected by water stress and soil types.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- water stress and soil typese5
- Outcome
- number of opened bollse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e5“Despite variations in water stress and soil types affecting the number of opened bolls”
Claim · model-written summary
Cotton yield and irrigation water productivity declined, though not significantly under certain irrigation treatments.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- irrigation treatmentse6
- Outcome
- cotton yield and IWPe6
- Direction
- declinee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e6“the cotton yield and IWP demonstrated a decline, though not significantly under certain irrigation treatments”
Claim · model-written summary
The CROPGROW-DSSAT model calibration showed strong concordance with observed cotton data.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- concordance between the model-calibrated and observed datae7
- Comparator
- observed datae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e7“The substantial R 2 value indicates a strong concordance between the model-calibrated and observed data”
Claim · model-written summary
Specific deficit irrigation strategies may maintain cotton yield while reducing water use.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- maintain cotton yield production while reducing water usagee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e1“it is suggested that the specific deficit irrigation strategies may maintain cotton yield production while reducing water usage”
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