Abstract
ABSTRACT The objective of this study was to evaluate the growth and accumulation of ions in lettuce grown in different hydroponic systems and recirculation frequencies. The experimental design was randomized blocks with 8 treatments and 4 replicates. The evaluated hydroponic systems were Nutrient Flow Technique (NFT) and an adapted Deep Flow Technique (DFT), the latter with recirculation frequencies of 0.25, 2 and 4 h. Both systems used fresh water and brackish water. Plant growth, accumulation of inorganic solutes (Na+, K+, Cl- and NO3-) and the correlation between dry matter production and Na+/K+ and Cl-/NO3- were evaluated. The salinity of the water used to prepare the nutrient solution caused decrease in growth and K+ and NO3- levels, and increased contents of Na+ and Cl- in the plants. When using fresh water the highest dry matter production was obtained in the NFT system. In case of brackish water the adapted DFT system increased the production, in relation to NFT system (at same recirculation frequency: 0.25 h). It was found that the choice of the type of hydroponic system and recirculation interval for the cultivation of lettuce depends on the quality of the water used to prepare the nutrient solution.
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Claims 6
Claim · model-written summary
Saline nutrient water decreased lettuce growth.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- salinity of the watere0
- Outcome
- growthe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salinity of the water used to prepare the nutrient solution caused decrease in growth and K+ and NO3- levels”
t0“lettuce”
Claim · model-written summary
Saline nutrient water decreased lettuce K+ and NO3- levels.
- Taxon
- lettuceLactuca sativat0
- Treatment
- salinity of the watere0
- Outcome
- K+ and NO3- levelse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salinity of the water used to prepare the nutrient solution caused decrease in growth and K+ and NO3- levels”
t0“lettuce”
Claim · model-written summary
Saline nutrient water increased lettuce Na+ and Cl- contents.
- Taxon
- lettuceLactuca sativat0
- Treatment
- salinity of the watere0
- Outcome
- contents of Na+ and Cl-e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salinity of the water used to prepare the nutrient solution caused decrease in growth and K+ and NO3- levels, and increased contents of Na+ and Cl- in the plants”
t0“lettuce”
Claim · model-written summary
With fresh water, NFT produced the highest dry matter.
- Taxon
- lettuceLactuca sativat0
- Treatment
- NFT systeme0
- Outcome
- dry matter productione0
- Direction
- higheste0
- Qualifier
- fresh watere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When using fresh water the highest dry matter production was obtained in the NFT system”
t0“lettuce”
Claim · model-written summary
With brackish water, adapted DFT increased production relative to NFT at the same recirculation frequency.
- Taxon
- lettuceLactuca sativat0
- Treatment
- adapted DFT systeme0
- Outcome
- productione0
- Direction
- increasede0
- Qualifier
- at same recirculation frequency: 0.25 he0
- Comparator
- NFT systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In case of brackish water the adapted DFT system increased the production, in relation to NFT system (at same recirculation frequency: 0.25 h)”
t0“lettuce”
Claim · model-written summary
The preferred hydroponic system and recirculation interval depend on nutrient-solution water quality.
- Taxon
- lettuceLactuca sativae0
- Outcome
- choice of the type of hydroponic system and recirculation intervale0
- Qualifier
- quality of the watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the choice of the type of hydroponic system and recirculation interval for the cultivation of lettuce depends on the quality of the water used to prepare the nutrient solution”
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See all 6 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.