Abstract
ABSTRACT Lettuce is a leafy vegetable sensitive to salinity, and under saline stress conditions it presents nutritional imbalance, mainly in calcium absorption. Thus, the objective was to evaluate the effect of enriching the nutrient solution with calcium nitrate in solutions prepared with saline water in the lettuce crop. A completely randomized design was used, with five treatments and four replicates. The treatments were represented by five nutrient solutions [S1 - standard nutrient solution (SNP); S2 - SNP + NaCl (3.5 dS m-1); S3 - S2 + Ca (NO3)2 (50% = 6.86 mmol L-1); S4 - S2 + Ca(NO3)2 (100% = 9.15 mmol L-1); S5 - S2 + Ca(NO3)2 (150% = 11.43 mmol L-1)] in lettuce from the curly group, cv. Elba. After preparing the nutrient solutions, the solutions had the following electrical conductivities: 1.8 (S1); 4.8 (S2); 5.4 (S3); 6.0 (S4); 6.6 (S5) dS m-1. Variables of growth, nutrition and postharvest quality of lettuce were evaluated. With the exception of stem diameter, number of total leaves, plant pH and vitamin C content, the other variables were affected by the extra addition of Ca(NO3)2 in the nutrient solutions. The lettuce cv Elba grown in coconut fiber is tolerant to the salinity of 4.8 dS m-1 (S2). In conditions where the use of saline water with 3.5 dS m-1 for the preparation of the nutrient solution is unavoidable, the use of extra doses of Ca(NO3)2 in the lettuce crop is not recommended.
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Claims 4
Claim · model-written summary
Extra calcium nitrate affected most measured lettuce growth, nutrition and postharvest variables, except stem diameter, total leaf number, plant pH and vitamin C.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- extra addition of Ca(NO3)2e0
- Outcome
- other variablese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of stem diameter, number of total leaves, plant pH and vitamin C content, the other variables were affected by the extra addition of Ca(NO3)2 in the nutrient solutions.”
t0“lettuce”
Claim · model-written summary
Stem diameter, total leaf number, plant pH and vitamin C content were exceptions to the reported effects of extra calcium nitrate.
- Taxon
- lettuceLactuca sativat0
- Treatment
- extra addition of Ca(NO3)2e0
- Outcome
- stem diameter, number of total leaves, plant pH and vitamin C contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of stem diameter, number of total leaves, plant pH and vitamin C content, the other variables were affected by the extra addition of Ca(NO3)2 in the nutrient solutions.”
t0“lettuce”
Claim · model-written summary
Elba lettuce grown in coconut fiber was judged tolerant of nutrient solution salinity of 4.8 dS m-1.
- Taxon
- lettuceLactuca sativae0
- Material
- Elbae0
- Outcome
- tolerant to the salinity of 4.8 dS m-1e0
- Value
- 4.8 dS m-1e0
- Setting
- coconut fibere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lettuce cv Elba grown in coconut fiber is tolerant to the salinity of 4.8 dS m-1 (S2).”
Claim · model-written summary
The authors do not recommend extra calcium nitrate when 3.5 dS m-1 saline water must be used for lettuce nutrient solution.
- Taxon
- lettuceLactuca sativae0
- Outcome
- use of extra doses of Ca(NO3)2 in the lettuce crop is not recommendede0
- Qualifier
- saline water with 3.5 dS m-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In conditions where the use of saline water with 3.5 dS m-1 for the preparation of the nutrient solution is unavoidable, the use of extra doses of Ca(NO3)2 in the lettuce crop is not recommended.”
The same questions in other papers
calcium atom · quality: phytochemicals · Lactuca sativa (garden lettuce)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
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See all 5 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.