Macronutrient cycling in hydroponic lettuce cultivation

In order to address issues of limited resources and contamination by fertilizers, nutrient solutions may be reused in hydroponics as an alternative to their disposal in the environment. This work evaluated the feasibility of nutrient replacement for the nutrient solutions reused during lettuce hydro...

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Bibliographic Details
Published in:	Revista ambiente & água Vol. 17; no. 5; pp. 1 - 11
Main Authors:	Macedo, Priscila Helena da Silva, Lopes, Emily Mariano da Cruz, Lopes, Mariano Vieira dos Santos de Souza, Sala, Fernando César, Souza, Claudinei Fonseca
Format:	Journal Article
Language:	English
Published:	Instituto de Pesquisas Ambientais em Bacias Hidrográficas 04-10-2022 Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi)
Subjects:	ENGINEERING, ENVIRONMENTAL hydroponic system lactuca sativa l macronutrient rational use macronutrient rational use hydroponic system Lactuca sativa L hidroponia uso racional de macronutrientes
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Summary:	In order to address issues of limited resources and contamination by fertilizers, nutrient solutions may be reused in hydroponics as an alternative to their disposal in the environment. This work evaluated the feasibility of nutrient replacement for the nutrient solutions reused during lettuce hydroponic cultivation. The experiment was carried out in an agricultural greenhouse in an NFT hydroponic system using the “Milena” lettuce cultivar. The experiment was divided into two stages: 1) monitoring and data collection and proposition of nutrient replacement management; and 2) validation of the proposed replacement management. Monitoring the consumption of the crop's nutritional solution in the first stage served as the basis for the proposed nutritional replacement management. Management was validated in the second stage through the evaluation of fresh and dry mass, crop nutritional status, and the amount of the fertilizer applied in the treatments: T1 - nutrient replacement with nutrient solution reuse; and T2 - nutrient replacement without nutrient solution reuse. The fresh and dry mass data and the amount of nutrients absorbed by the plants were submitted to the t-test at 5% probability, showing no significant difference between the treatments, making it possible to conclude that the nutrient solution reuse provided nutrient replacement during the lettuce crop cultivation. Keywords: hydroponic system, Lactuca sativa L., macronutrient rational use.
ISSN:	1980-993X 1980-993X
DOI:	10.4136/ambi-agua.2849