Plantas de alface (Lactuca sativa L.) submetidas à água salina e doses de resíduos orgânicos agroindustriais

• Ano de defesa: 2023
• Autor(a) principal: Paulino, Lindenberg Costa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Salinidade; Matéria orgânica; Manejo do solo; Carnaúba; Coco; Sustentabilidade
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/72753

Water supply is indispensable for the production of crops of economic interest and the use of quality water is fundamental to achieve high yields, especially in vegetable crops such as lettuce. The water issue in regions like the Northeast of Brazil is considered critical due to the condition of high evapotranspiration combined with irregular precipitation. Organic waste from agroindustrial production can contribute to improving water availability through increased water retention, while also aiding in soil fertilization. Therefore, the general objective was to characterize and evaluate the growth, physiology, and production of lettuce conditioned to irrigation with saline water and fertilization with compost produced with agroindustrial waste. For this, the experimental design was used in randomized blocks with treatments arranged in factorial (5x3), being an experiment for each residue (carnauba bagana and green coconut). Five doses of composted organic residues (0, 250, 500, 750 and 1000 g/vase 1) and three levels of electrical conductivity (0, 2.5 and 5 dS m-¹) were applied for irrigation with saline water, counting 15 treatments and 4 repetitions for each residue studied, under greenhouse conditions. We evaluated the biometric responses as leaf area, number of leaves and biomass; and gas exchange as photosynthetic rate, stomatal conductance and transpiration rate of the lettuce plants. The results showed the greatest biometric responses when the dose of 250 g plant-1¹ of compost was used in relation to the control in both studies, regardless of salinity. For the physiological responses, the dose of 500 g plant-1¹ of compost showed the highest averages in the variables studied in relation to the control in the residues studied, regardless of the salinity applied, especially in the variables A and Gs. Irrigation with saline water reduced the response of lettuce plants, but observed at levels of 2.5 dS m-¹ of electrical condutivity associated with the doses of compost, especially compost based on carnauba bagasse residue, it is possible to produce satisfactorily.