Navegando por Autor "Pereira, Dalbert de Freitas"

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    Características agronômicas e qualidade pós-colheita de cultivares de alface em função de épocas de cultivo no oeste alagoano
    (INSTITUTO FEDERAL DE ALAGOAS - Ifal, 2021-09-28) Pereira, Dalbert de Freitas; Cruz, Ellen Abreu da; http://lattes.cnpq.br/8433613370953519; Souza, Ênio Gomes Flôr; http://lattes.cnpq.br/9225008513028085; Moraes, Juliana de Oliveira; http://lattes.cnpq.br/0249683112485476; Coelho Júnior, Luiz Ferreira; https://orcid.org/0000-0002-3845-4054; http://lattes.cnpq.br/8286952885006223
    Lettuce, when produced in adverse environmental conditions, as found in the arid northeastern Brazilian state of Alagoas, is induced to precocious flowering and low quality, not reaching the maximum vegetative potential of the crop. Adequate choice of cultivar and growing season are crucial for the successful planting of this vegetable. Accordingly, the main objective of this work was to evaluate the production and postharvest quality of lettuce cultivars as a function of different growing seasons in the municipality of Piranhas, west of the state of Alagoas– Campus Piranhas. Two experiments were conducted, one in the winter of 2019 and the other in the summer of 2020, at the Alagoas Federal Institute of Technology’s Experimental Area. The experimental process was designed on a randomized blocks basis, with four reproductions, and with treatments referring to the following cultivars: Babá-de-Verão, Cinderela, Elba, Mônica, Solaris and Veneranda. The agronomic characteristics evaluated in this process were the following: plant height and diameter, number of leaves per plant, stalk length and diameter, green mass yield and dry mass yield. The postharvest characteristics evaluated were the following: a, b and total chlorophylls, carotenoids, total soluble solids (TSS), pH, total titratable acidity (TTA) and TSS / TTA ratio. Regarding plant diameter, winter cultivation showed to be more appropriate than summer one, except for Babá-de-Verão, which maintained its performance; on the other hand, all cultivars had equal diameters in winter and Babá-de-Verão performed better on summer. The winter cultivation provided the best performance for the cultivars, with plant height of 19.46 cm, stalk diameter of 1.81 cm and green mass yield of 25.68 t ha-1 , while on summer they reached the greatest number of leaves (19.39 leaves per plant). Mônica cultivar reached the highest stalk length (10.69 cm), indicating less tolerance to early braiding, so it is not suitable for cultivation in the region. Babá-de-Verão reached the highest yield of green mass (26.95 t ha-1 ), number of leaves per plant (27.60 leaves) and stalk diameter (2.17 cm), being the most suitable cultivar for the west of Alagoas context. Among the crimpy cultivars, Elba, Solaris and Veneranda prevailed. The Babá-de-Verão cultivar presented the best performance for a, b and totals chlorophylls, with averages of 7.73 μg g -1 ; 5.16 μg g -1 and 12.89 μg g -1 , respectively. Solaris showed the highest concentration of carotenoids (1.02 μg g -1 ). Concerning TSS, there was no difference in the mean test between cultivars (4.72 oBrix). Winter plants achieved higher chlorophylls at (6.62 μg g -1 ) and total (10.46 μg g -1 ), carotenoids (1.01 μg g -1 ), pH (6.24) and TSS / TTA (8.14), whereas summer lettuce approached a higher TSS (4.97 oBrix) and TTA (0.68 %). Lettuce produced on winter reached better post-harvest quality, with higher percentage of photosynthetic pigments and lower acidity.