Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system
The production of lettuce in hydroponic systems with a recirculating nutrient solution has been growing, so it is necessary to evaluate the growth and quality of production under this system. Two harvest cycles were evaluated, comparing the behavior of physiological variables and growth rates on let...
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| Format: | Article |
| Language: | English |
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Centro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de Colombia
2017-05-01
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| Series: | Agronomía Colombiana |
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| Online Access: | https://revistas.unal.edu.co/index.php/agrocol/article/view/63439 |
| _version_ | 1819163321415237632 |
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| author | Andrea Johana Reyes M. Javier Giovanni Álvarez-Herrera Rafael David Fraile-Robayo Omar Ferney Álvarez-Herrera Ana Lucía Fraile-Robayo |
| author_facet | Andrea Johana Reyes M. Javier Giovanni Álvarez-Herrera Rafael David Fraile-Robayo Omar Ferney Álvarez-Herrera Ana Lucía Fraile-Robayo |
| author_sort | Andrea Johana Reyes M. |
| collection | DOAJ |
| description | The production of lettuce in hydroponic systems with a recirculating nutrient solution has been growing, so it is necessary to evaluate the growth and quality of production under this system. Two harvest cycles were evaluated, comparing the behavior of physiological variables and growth rates on lettuce plants in a hydroponic system with a plastic cover. Lettuce plants were planted at 30 days after germination in an NFT hydroponic system. Nutrient solutions were prepared with sources of potassium nitrate, calcium nitrate, urea phosphate, magnesium sulfate and a source of minor nutrifeed. The second cycle had the highest total dry mass and leaf area index (LAI) at 43 days after transplant (dat). The relative growth rate (RGR) declined over time. The absolute growth rate (AGR) resented a sigmoid behavior as a gaussian bell shape; the leaf area index (LAI) increased until 43 dat, with the second cycle presenting the highest value; the net assimilation rate (NAR) decreased over time, with the second cycle having the highest value at 22 dat. The chlorophyll content for this variety was low, with a yellow pigmentation in the plant. The stomatal conductance (SC) in the two cycles at transplant time presented low values caused by the stress leaded by an imbalance in the pH of the solution, when the plants adapted to the system, this value increased. |
| first_indexed | 2024-12-22T17:42:16Z |
| format | Article |
| id | doaj.art-55b9bce364614152915ccd2050c40ff5 |
| institution | Directory Open Access Journal |
| issn | 0120-9965 2357-3732 |
| language | English |
| last_indexed | 2024-12-22T17:42:16Z |
| publishDate | 2017-05-01 |
| publisher | Centro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de Colombia |
| record_format | Article |
| series | Agronomía Colombiana |
| spelling | doaj.art-55b9bce364614152915ccd2050c40ff52022-12-21T18:18:23ZengCentro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de ColombiaAgronomía Colombiana0120-99652357-37322017-05-0135221622210.15446/agron.colomb.v35n2.6343947216Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic systemAndrea Johana Reyes M.0Javier Giovanni Álvarez-Herrera1Rafael David Fraile-Robayo2Omar Ferney Álvarez-Herrera3Ana Lucía Fraile-Robayo4Pedagógica y Tecnológica de Colombia (UPTC), Tunja (Colombia).Group of Agricultural Research (GIA in spanish), Faculty of Agricultural Sciences, Universidad Pedagógica y Tecnológica de Colombia (UPTC), Tunja (Colombia).Group of Agricultural Research (GIA in spanish), Faculty of Agricultural Sciences, Universidad Pedagógica y Tecnológica de Colombia (UPTC), Tunja (Colombia).Pedagógica y Tecnológica de Colombia (UPTC), Tunja (Colombia). School of Exact Science and Engineering, Universidad Sergio Arboleda, Bogota (Colombia).Pedagógica y Tecnológica de Colombia (UPTC), Tunja (Colombia).The production of lettuce in hydroponic systems with a recirculating nutrient solution has been growing, so it is necessary to evaluate the growth and quality of production under this system. Two harvest cycles were evaluated, comparing the behavior of physiological variables and growth rates on lettuce plants in a hydroponic system with a plastic cover. Lettuce plants were planted at 30 days after germination in an NFT hydroponic system. Nutrient solutions were prepared with sources of potassium nitrate, calcium nitrate, urea phosphate, magnesium sulfate and a source of minor nutrifeed. The second cycle had the highest total dry mass and leaf area index (LAI) at 43 days after transplant (dat). The relative growth rate (RGR) declined over time. The absolute growth rate (AGR) resented a sigmoid behavior as a gaussian bell shape; the leaf area index (LAI) increased until 43 dat, with the second cycle presenting the highest value; the net assimilation rate (NAR) decreased over time, with the second cycle having the highest value at 22 dat. The chlorophyll content for this variety was low, with a yellow pigmentation in the plant. The stomatal conductance (SC) in the two cycles at transplant time presented low values caused by the stress leaded by an imbalance in the pH of the solution, when the plants adapted to the system, this value increased.https://revistas.unal.edu.co/index.php/agrocol/article/view/63439RGRAGRNARSPADstomatal conductance. |
| spellingShingle | Andrea Johana Reyes M. Javier Giovanni Álvarez-Herrera Rafael David Fraile-Robayo Omar Ferney Álvarez-Herrera Ana Lucía Fraile-Robayo Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system Agronomía Colombiana RGR AGR NAR SPAD stomatal conductance. |
| title | Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system |
| title_full | Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system |
| title_fullStr | Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system |
| title_full_unstemmed | Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system |
| title_short | Evaluation of the growth and quality of lettuce (<i>Lactuca sativa</i> L.) in a closed recirculating hydroponic system |
| title_sort | evaluation of the growth and quality of lettuce i lactuca sativa i l in a closed recirculating hydroponic system |
| topic | RGR AGR NAR SPAD stomatal conductance. |
| url | https://revistas.unal.edu.co/index.php/agrocol/article/view/63439 |
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