O reúso de soluções nutritivas em hidroponia se torna alternativa ao descarte de água e nutrientes no ambiente, já que a escassez desses recursos e a contaminação do solo por fertilizantes são problemas, tanto econômicos quanto ambientais. Este trabalho avaliou a viabilidade da reposição de nutrientes para o reúso das soluções nutritivas descarte durante o desenvolvimento da cultura da alface em hidroponia. O experimento foi realizado em estufa agrícola, em sistema hidropônico NFT utilizando a cultivar de alface Milena. O experimento foi dividido em duas etapas, sendo a primeira: monitoramento e coleta de dados e proposição de manejo da reposição de nutrientes e a segunda: validação do manejo de reposição proposto. O monitoramento do consumo da solução nutricional da cultura, na primeira etapa, serviu como base para o manejo de reposição nutricional proposto. O manejo foi validado na segunda etapa através da avaliação das massas fresca e seca, o estado nutricional da cultura e a quantidade de fertilizantes aplicados nos tratamentos, T1 - reposição de nutrientes com reaproveitamento da solução nutritiva e T2 - reposição de nutrientes sem reaproveitamento da solução nutritiva. Os dados de massa fresca e seca e a quantidade de nutrientes absorvidos pelas plantas foram submetidos ao teste estatístico T ao nível de 5% de significância, mostrando não haver diferença significativa entre os tratamentos, sendo possível concluir que a reposição de nutrientes proporcionou o reúso da solução nutritiva durante o desenvolvimento da cultura da alface.
Palavras-chave: hidroponia; Lactuca sativa L.; uso racional de macronutrientes
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
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
