Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses

Sustainable agriculture relies on replacing fossil-based mineral fertilizers, which are highly cost-energetic to produce, and demand extensive use of scarce natural resources. Today, agronomic practices within the concept of circular economy are emerging and, as such, the exploitation of digestate a...

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Autores principales:	Georgios K. Ntinas, Filippos Bantis, Athanasios Koukounaras, Panagiotis G. Kougias
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	greenhouse biogas plant liquid digestate nutrient uptake sustainability residual resource recovery Technology T
Acceso en línea:	https://doaj.org/article/8fac3d1bd3d244bba1c7c829b326c541
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spelling	oai:doaj.org-article:8fac3d1bd3d244bba1c7c829b326c5412021-11-11T15:58:07ZExploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses10.3390/en142171991996-1073https://doaj.org/article/8fac3d1bd3d244bba1c7c829b326c5412021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7199https://doaj.org/toc/1996-1073Sustainable agriculture relies on replacing fossil-based mineral fertilizers, which are highly cost-energetic to produce, and demand extensive use of scarce natural resources. Today, agronomic practices within the concept of circular economy are emerging and, as such, the exploitation of digestate as a biofertilizer and soil amender is extensively investigated. This study aimed at evaluating the agronomic potential of liquid digestate as the sole nutrient source for hydroponic cultivation of baby lettuce in greenhouses. Growth rate, physiological responses, concentration of secondary metabolites, and nutrient uptake were compared between baby leaf lettuce grown in digestate in concentrations of 5, 10, and 20% diluted in water (either with or without pH adjustment) and in Hoagland solution (control). Results showed that the production yield was negatively correlated with the concentration of the added digestate. Nevertheless, the antioxidant capacity was significantly enhanced in 5 and 10% liquid digestate treatments compared to the control. Additionally, the nutrient composition in the baby leaf lettuce and the reduction in nutrient concentrations in the growth media demonstrated efficient mineral uptake by the plants. Thus, the application of liquid digestate as a fertilizer in hydroponic systems is a promising practice to recover residual resources, leading to the transition towards more sustainable greenhouse production.Georgios K. NtinasFilippos BantisAthanasios KoukounarasPanagiotis G. KougiasMDPI AGarticlegreenhousebiogas plantliquid digestatenutrient uptakesustainabilityresidual resource recoveryTechnologyTENEnergies, Vol 14, Iss 7199, p 7199 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	greenhouse biogas plant liquid digestate nutrient uptake sustainability residual resource recovery Technology T
spellingShingle	greenhouse biogas plant liquid digestate nutrient uptake sustainability residual resource recovery Technology T Georgios K. Ntinas Filippos Bantis Athanasios Koukounaras Panagiotis G. Kougias Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
description	Sustainable agriculture relies on replacing fossil-based mineral fertilizers, which are highly cost-energetic to produce, and demand extensive use of scarce natural resources. Today, agronomic practices within the concept of circular economy are emerging and, as such, the exploitation of digestate as a biofertilizer and soil amender is extensively investigated. This study aimed at evaluating the agronomic potential of liquid digestate as the sole nutrient source for hydroponic cultivation of baby lettuce in greenhouses. Growth rate, physiological responses, concentration of secondary metabolites, and nutrient uptake were compared between baby leaf lettuce grown in digestate in concentrations of 5, 10, and 20% diluted in water (either with or without pH adjustment) and in Hoagland solution (control). Results showed that the production yield was negatively correlated with the concentration of the added digestate. Nevertheless, the antioxidant capacity was significantly enhanced in 5 and 10% liquid digestate treatments compared to the control. Additionally, the nutrient composition in the baby leaf lettuce and the reduction in nutrient concentrations in the growth media demonstrated efficient mineral uptake by the plants. Thus, the application of liquid digestate as a fertilizer in hydroponic systems is a promising practice to recover residual resources, leading to the transition towards more sustainable greenhouse production.
format	article
author	Georgios K. Ntinas Filippos Bantis Athanasios Koukounaras Panagiotis G. Kougias
author_facet	Georgios K. Ntinas Filippos Bantis Athanasios Koukounaras Panagiotis G. Kougias
author_sort	Georgios K. Ntinas
title	Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
title_short	Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
title_full	Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
title_fullStr	Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
title_full_unstemmed	Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses
title_sort	exploitation of liquid digestate as the sole nutrient source for floating hydroponic cultivation of baby lettuce (<i>lactuca sativa</i>) in greenhouses
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8fac3d1bd3d244bba1c7c829b326c541
work_keys_str_mv	AT georgioskntinas exploitationofliquiddigestateasthesolenutrientsourceforfloatinghydroponiccultivationofbabylettuceilactucasativaiingreenhouses AT filipposbantis exploitationofliquiddigestateasthesolenutrientsourceforfloatinghydroponiccultivationofbabylettuceilactucasativaiingreenhouses AT athanasioskoukounaras exploitationofliquiddigestateasthesolenutrientsourceforfloatinghydroponiccultivationofbabylettuceilactucasativaiingreenhouses AT panagiotisgkougias exploitationofliquiddigestateasthesolenutrientsourceforfloatinghydroponiccultivationofbabylettuceilactucasativaiingreenhouses
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Exploitation of Liquid Digestate as the Sole Nutrient Source for Floating Hydroponic Cultivation of Baby Lettuce (<i>Lactuca sativa</i>) in Greenhouses

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