Abstract
Developing sustainable strategies for natural resource management and conservation under shifting climatic scenarios is increasingly necessary due to exacerbated abiotic stresses, such as salinity. Under salt stress, several negative effects are observed in plants, particularly in leafy vegetables such as lettuce (Lactuca sativa L.). To mitigate the effects of saline stress from brackish water, several strategies have been adopted, including hydroponic cultivation. Therefore, this study aimed to determine the effects of variations in nutrient solution concentration and volume per lettuce plant cultivated in a nutrient film technique (NFT) hydroponic system using brackish water. The experiment was conducted using a randomized complete block design in a 2 × 2 × 2 factorial scheme, combining two levels of water electrical conductivity (ECw of 0.3 and 5.0 dS m−1), two nutrient solution concentrations (NSC of 50 and 100%), and two nutrient solution volumes (NSV of 1 and 2 L plant−1), with four replications. Growth, production, and water productivity variables were evaluated at 20 and 25 days following the imposition of treatments. The responses of the variables to saline stress varied according to the evaluation period (20 and 25 days), depending on the NSC and NSV levels. At the end of the 25-day cycle, it can be concluded that for lettuce cultivation using brackish water, the NSC can be reduced to 50% and provide an NSV of 2 L plant−1. Under these growing conditions, leaf fresh matter production loss was approximately 40% lower than under cultivation without saline stress, which yielded 144.11 g plant−1 under 100% NSC and an NSV of 2 L plant−1. In contrast, water productivity of fresh matter was similar, at 78.68 and 76.55 g L−1, respectively.
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Claims 5
Claim · model-written summary
For lettuce grown hydroponically with brackish water, the nutrient solution concentration can be reduced to 50% while providing 2 L per plant.
- Taxon
- lettuce
Lactuca sativae0 - Outcome
- the NSC can be reduced to 50%e0
- Qualifier
- NSV of 2 L plant−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for lettuce cultivation using brackish water, the NSC can be reduced to 50% and provide an NSV of 2 L plant−1”
Claim · model-written summary
Leaf fresh matter production loss under saline stress was approximately 40% lower than under cultivation without saline stress.
- Taxon
- LettuceLactuca sativat0
- Outcome
- leaf fresh matter production losse0
- Direction
- lowere0
- Value
- approximately 40%e0
- Comparator
- cultivation without saline stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hydroponic Lettuce”
e0“leaf fresh matter production loss was approximately 40% lower than under cultivation without saline stress”
Claim · model-written summary
Lettuce without saline stress under 100% nutrient solution concentration and 2 L per plant yielded 144.11 g per plant of leaf fresh matter.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 100% NSC and an NSV of 2 L plant−1e0
- Outcome
- leaf fresh matter productione0
- Value
- 144.11 g plant−1e0
- Qualifier
- without saline stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hydroponic Lettuce”
e0“leaf fresh matter production loss was approximately 40% lower than under cultivation without saline stress, which yielded 144.11 g plant−1 under 100% NSC and an NSV of 2 L plant−1”
Claim · model-written summary
Water productivity of fresh matter was similar under the two compared conditions, at 78.68 and 76.55 g per litre.
- Taxon
- LettuceLactuca sativat0
- Outcome
- water productivity of fresh mattere0
- Direction
- similare0
- Value
- 78.68 and 76.55 g L−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hydroponic Lettuce”
e0“water productivity of fresh matter was similar, at 78.68 and 76.55 g L−1, respectively”
Claim · model-written summary
The responses of the measured variables to saline stress varied with the evaluation period (20 and 25 days) and with the nutrient solution concentration and volume.
- Taxon
- LettuceLactuca sativat0
- Outcome
- responses of the variables to saline stresse0
- Qualifier
- varied according to the evaluation period (20 and 25 days), depending on the NSC and NSV levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hydroponic Lettuce”
e0“The responses of the variables to saline stress varied according to the evaluation period (20 and 25 days), depending on the NSC and NSV levels”