Abstract
The effect of irrigation regimes with saline water on soil salinity, yield and water productivity of autumn-winter growth lettuce was evaluated during two years under actual commercial-farming conditions in the arid region of Tunisia. Lettuce was grown on a sandy soil and drip-irrigated with a water having an electrical conductivity (ECi) of 3.6 dS/m. For the two years, a complete randomized block design with four replicates was used to evaluate three irrigation regimes. Irrigation regimes consisted in replacement of cumulated crop evapotranspiration (ETc) when readily available water is depleted with levels of 100% (FI-100), 60% (DI-60) and 30% (DI-30). FI-100 was considered as full irrigation (FI) while DI-60 and DI-30 were considered as deficit irrigation (DI) regimes. Results show that higher soil salinity in the root zone is observed at harvest under DI-30 treatment in both years (4 and 4.8 dS/m) compared to FI-100 treatment (2.6 and 3.1 dS/m). Relatively low soil salinity values were also observed under DI-60 treatments with respectively 3 and 3.8 dS/m. Highest lettuce yields for both years were obtained with FI100 treatment (45.8 and 42.6 t/ha). Compared to FI-100, significant reductions in lettuce yields were observed under DI-60 and DI-30 deficit irrigation treatments resulting from a reduction in head diameter and leaf number. Irrigation treatments had no significant effects on plant dry weight but they produced significant differences in total soluble solids (TSS) content of lettuce. For all irrigation treatments, lettuce yields were higher in the first year compared to the following year. Water productivity (WP) values reflected this difference and varied between 14 and 34.3 Kg/m 3 . The lowest WP values were observed for the treatment FI-100, while the highest values were obtained under DI-30 deficit irrigation treatment. The FI-100 treatment seems to optimize the use of saline water in lettuce production and to control soil salinity. Under situations of water shortage, adopting deficit irrigation strategies (DI-60) could be an alternative for irrigation scheduling of lettuce crop under the arid conditions of southern Tunisia.
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Claims 14
Claim · model-written summary
DI-30 produced higher root-zone soil salinity than FI-100 in both years.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- DI-30e0
- Outcome
- soil salinity in the root zonee0
- Direction
- highere0
- Value
- 4 and 4.8 dS/me0
- Qualifier
- 2.6 and 3.1 dS/me0
- Comparator
- FI-100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher soil salinity in the root zone is observed at harvest under DI-30 treatment in both years (4 and 4.8 dS/m) compared to FI-100 treatment (2.6 and 3.1 dS/m)”
t0“lettuce”
Claim · model-written summary
DI-60 had relatively low soil salinity in both years.
- Taxon
- lettuceLactuca sativat0
- Treatment
- DI-60e0
- Outcome
- soil salinity valuese0
- Direction
- lowe0
- Value
- 3 and 3.8 dS/me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relatively low soil salinity values were also observed under DI-60 treatments with respectively 3 and 3.8 dS/m”
t0“lettuce”
Claim · model-written summary
FI100 had the highest lettuce yields in both years.
- Taxon
- lettuceLactuca sativae0
- Treatment
- FI100e0
- Outcome
- lettuce yieldse0
- Direction
- Higheste0
- Value
- 45.8 and 42.6 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest lettuce yields for both years were obtained with FI100 treatment (45.8 and 42.6 t/ha)”
Claim · model-written summary
DI-60 significantly reduced lettuce yield versus FI-100.
- Taxon
- lettuceLactuca sativat0
- Treatment
- DI-60e0
- Outcome
- lettuce yieldse0
- Direction
- reductionse0
- Comparator
- FI-100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to FI-100, significant reductions in lettuce yields were observed under DI-60 and DI-30 deficit irrigation treatments”
t0“lettuce”
Claim · model-written summary
DI-30 significantly reduced lettuce yield versus FI-100.
- Taxon
- lettuceLactuca sativat0
- Treatment
- DI-30e0
- Outcome
- lettuce yieldse0
- Direction
- reductionse0
- Comparator
- FI-100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to FI-100, significant reductions in lettuce yields were observed under DI-60 and DI-30 deficit irrigation treatments”
t0“lettuce”
Claim · model-written summary
Deficit irrigation reduced head diameter and leaf number.
- Taxon
- lettuceLactuca sativat0
- Treatment
- irrigation regimes with saline watert0
- Outcome
- head diameter and leaf numbere0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting from a reduction in head diameter and leaf number”
t0“lettuce under irrigation regimes with saline water”
Claim · model-written summary
Irrigation treatments did not significantly change plant dry weight.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Irrigation treatmentse0
- Outcome
- plant dry weighte0
- Direction
- no significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation treatments had no significant effects on plant dry weight”
t0“lettuce”
Claim · model-written summary
Irrigation treatments significantly differed in lettuce TSS content.
- Taxon
- lettuceLactuca sativae0
- Treatment
- irrigation regimes with saline watert0
- Outcome
- total soluble solids (TSS) contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they produced significant differences in total soluble solids (TSS) content of lettuce”
t0“irrigation regimes with saline water”
Claim · model-written summary
Lettuce yields were higher in the first year for all treatments.
- Taxon
- lettuceLactuca sativae0
- Treatment
- all irrigation treatmentse0
- Outcome
- lettuce yieldse0
- Direction
- highere0
- Comparator
- the following yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For all irrigation treatments, lettuce yields were higher in the first year compared to the following year”
Claim · model-written summary
Water productivity varied between 14 and 34.3 Kg/m 3.
- Taxon
- lettuceLactuca sativat0
- Outcome
- Water productivity (WP) valuese0
- Value
- 14 and 34.3 Kg/m 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water productivity (WP) values reflected this difference and varied between 14 and 34.3 Kg/m 3”
t0“lettuce”
Claim · model-written summary
FI-100 had the lowest water productivity.
- Taxon
- lettuceLactuca sativat0
- Treatment
- FI-100e0
- Outcome
- WP valuese0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest WP values were observed for the treatment FI-100”
t0“lettuce”
Claim · model-written summary
DI-30 had the highest water productivity.
- Taxon
- lettuceLactuca sativat0
- Treatment
- DI-30e0
- Outcome
- highest valuese0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest values were obtained under DI-30 deficit irrigation treatment”
t0“lettuce”
Claim · model-written summary
Authors consider FI-100 to optimize saline-water use and control soil salinity.
- Taxon
- lettuceLactuca sativae0
- Treatment
- FI-100e0
- Outcome
- optimize the use of saline water in lettuce production and to control soil salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The FI-100 treatment seems to optimize the use of saline water in lettuce production and to control soil salinity”
Claim · model-written summary
DI-60 could be an alternative during water shortage.
- Taxon
- lettuceLactuca sativae0
- Treatment
- DI-60e0
- Outcome
- alternative for irrigation schedulinge0
- Qualifier
- situations of water shortagee0
- Setting
- southern Tunisiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under situations of water shortage, adopting deficit irrigation strategies (DI-60) could be an alternative for irrigation scheduling of lettuce crop under the arid conditions of southern Tunisia”
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See all 57 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.