Abstract
Purpose: Floating hydroponic system for lettuce greenhouse production consists of plants inserted in styrofoam platform floating in a 15 cm-tall nutrient solution, which is aerated by some growers while others maintain the solution static. The present investigation had the objective of determining the effect of NO3−-N and K in Romaine lettuce cultivated in floating hydroponic system and the impact of nutrient solution aeration. Materials and methods: Plants were transplanted into 34 L rigid plastic containers with aerated or non-aerated solutions containing either 15/7, 12/8.5 or 12/2.85 meq L−1 of NO3−/K concentration. Results: Aeration of the nutrient solution promoted plant growth, leaf K, P, and Mg, and water uptake, however, photosynthesis and transpiration rates were enhanced under non-aeration conditions. Decreasing N did not affect leaf N uptake and accumulation; however, decreasing K markedly decreased leaf P and K in aerated plants. Despite the higher transpiration and stomatic conductance in non-aerated plants, water uptake was higher in aerated plants. Non-aerated plants exhibited decreased leaf K accumulation. Conclusions: non-aeration or reduction of K concentration of the nutrient solution may be a strategy to reduce leaf K in lettuce; leaf N concentration was unaffected by aeration.
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Claims 9
Claim · model-written summary
Aeration increased lettuce growth, leaf K, P and Mg, and water uptake.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- Aeration of the nutrient solutione0
- Outcome
- plant growth, leaf K, P, and Mg, and water uptakee0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aeration of the nutrient solution promoted plant growth, leaf K, P, and Mg, and water uptake”
t0“lettuce”
Claim · model-written summary
Non-aeration enhanced photosynthesis and transpiration rates.
- Taxon
- lettuceLactuca sativat0
- Treatment
- non-aeration conditionse0
- Outcome
- photosynthesis and transpiration ratese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthesis and transpiration rates were enhanced under non-aeration conditions.”
t0“lettuce”
Claim · model-written summary
Decreasing nitrogen did not affect lettuce leaf nitrogen uptake and accumulation.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Decreasing Ne0
- Outcome
- leaf N uptake and accumulatione0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing N did not affect leaf N uptake and accumulation”
t0“lettuce”
Claim · model-written summary
Decreasing potassium markedly reduced leaf P and K in aerated lettuce.
- Taxon
- lettuceLactuca sativat0
- Treatment
- decreasing Ke0
- Outcome
- leaf P and Ke0
- Direction
- decreasede0
- Qualifier
- aerated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing K markedly decreased leaf P and K in aerated plants.”
t0“lettuce”
Claim · model-written summary
Non-aerated lettuce had higher transpiration and stomatal conductance than aerated lettuce.
- Taxon
- lettuceLactuca sativat0
- Outcome
- transpiration and stomatic conductancee0
- Direction
- highere0
- Qualifier
- non-aerated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Despite the higher transpiration and stomatic conductance in non-aerated plants, water uptake was higher in aerated plants.”
t0“lettuce”
Claim · model-written summary
Water uptake was higher in aerated than non-aerated lettuce.
- Taxon
- lettuceLactuca sativat0
- Outcome
- water uptakee0
- Direction
- highere0
- Qualifier
- aerated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water uptake was higher in aerated plants.”
t0“lettuce”
Claim · model-written summary
Non-aerated lettuce accumulated less leaf K.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Non-aeratede0
- Outcome
- leaf K accumulatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-aerated plants exhibited decreased leaf K accumulation.”
t0“lettuce”
Claim · model-written summary
The authors propose non-aeration or lower potassium concentration to reduce leaf K in lettuce.
- Taxon
- lettuceLactuca sativae0
- Outcome
- strategy to reduce leaf Ke0
- Qualifier
- non-aeration or reduction of K concentration of the nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-aeration or reduction of K concentration of the nutrient solution may be a strategy to reduce leaf K in lettuce”
Claim · model-written summary
Aeration did not affect lettuce leaf N concentration.
- Taxon
- lettuceLactuca sativat0
- Treatment
- aeratione0
- Outcome
- leaf N concentratione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf N concentration was unaffected by aeration.”
t0“lettuce”
The same questions in other papers
fertilization · physiology: water · Lactuca sativa (garden lettuce)Results agree
9 papers in the same direction as this paper
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See all 10 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.