Abstract
Abstract BACKGROUND: There is growing interest among consumers in baby leaf vegetables, mostly requested for mixed salads, both as fresh market products and ready‐to‐use vegetables. Fertilisation is one of the most practical and effective ways of controlling and improving the yield and nutritional quality of crops for human consumption. The optimal fertiliser concentration for baby leaf vegetables depends on the environmental conditions. The aim of the present work was to determine the effects of nutrient solution concentration (2, 18, 34, 50 or 66 mequiv L −1 ) during two consecutive growing seasons (spring and summer) on the yield and leaf quality of Lactuca sativa L. var. acephala grown in a floating system. RESULTS: Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration, while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents. Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season. CONCLUSION: The use of nutrient solution concentrations of 37 and 44 mequiv L −1 for the spring and summer seasons respectively could be adopted in the present conditions to improve marketable fresh yield and leaf mineral content, but with a slight reduction in some nutritional parameters. Copyright © 2009 Society of Chemical Industry
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Claims 10
Claim · model-written summary
Marketable fresh yield, total dry biomass and leaf area index increased with nutrient solution concentration.
- Taxon
- Lactuca sativa
Lactuca sativae1 - Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- Marketable fresh yield, total dry biomass, leaf area indexe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
Claim · model-written summary
Macroelement (N, P, K and Mg) concentrations in lettuce leaves increased with nutrient solution concentration.
- Taxon
- Lactuca sativaLactuca sativae1
- Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- macroelement (N, P, K and Mg) concentrationse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
Claim · model-written summary
Nitrate and total chlorophyll contents increased with nutrient solution concentration.
- Taxon
- Lactuca sativaLactuca sativae1
- Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- nitrate and total chlorophyll contentse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
Claim · model-written summary
Root/shoot ratio decreased with increasing nutrient solution concentration.
- Taxon
- Lactuca sativaLactuca sativae1
- Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- root/shoot ratioe3
- Direction
- decreaseinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
e3“while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents”
Claim · model-written summary
Glucose, fructose and starch contents decreased with increasing nutrient solution concentration.
- Taxon
- Lactuca sativaLactuca sativae1
- Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- glucose, fructose, starche3
- Direction
- decreaseinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
e3“while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents”
Claim · model-written summary
Total carbohydrate and protein contents decreased with increasing nutrient solution concentration.
- Taxon
- Lactuca sativaLactuca sativae1
- Material
- var. acephalae1
- Treatment
- an increase in nutrient solution concentratione2
- Outcome
- total carbohydrate and protein contentse3
- Direction
- decreaseinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e2“Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration”
e3“while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents”
Claim · model-written summary
Lettuce grown in spring had lower yield and growth than lettuce grown in summer.
- Taxon
- Lactuca sativaLactuca sativae1
- Outcome
- yield and growthe4
- Direction
- lowere4
- Comparator
- summer seasone4
- Setting
- spring seasone4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e4“Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season”
Claim · model-written summary
Lettuce grown in spring had higher carbohydrate content than lettuce grown in summer.
- Taxon
- Lactuca sativaLactuca sativae1
- Outcome
- carbohydrate contente4
- Direction
- highere4
- Comparator
- summer seasone4
- Setting
- spring seasone4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e4“Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season”
Claim · model-written summary
Lettuce grown in spring had lower nitrate content than lettuce grown in summer.
- Taxon
- Lactuca sativaLactuca sativae1
- Outcome
- nitrate contente4
- Direction
- lowere4
- Comparator
- summer seasone4
- Setting
- spring seasone4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e4“Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season”
Claim · model-written summary
The authors recommend nutrient solution concentrations of 37 and 44 mequiv L-1 for spring and summer, respectively, for this lettuce system.
- Taxon
- Lactuca sativaLactuca sativae1
- Outcome
- nutrient solution concentrations of 37 and 44 mequiv L −1e5
- Qualifier
- with a slight reduction in some nutritional parameterse5
- Setting
- for the spring and summer seasonse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lactuca sativa L. var. acephala grown in a floating system”
e5“The use of nutrient solution concentrations of 37 and 44 mequiv L −1 for the spring and summer seasons respectively could be adopted in the present conditions to improve marketable fresh yield and leaf mineral content, but with a slight reduction in some nutritional parameters”
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