Resumo

FERREIRA, Tiago Alves; PASCUAL REYES, Irais Dolores; TAVARES, Aline Torquato  e  DO NASCIMENTO, Ildon Rodrigues. Modalities and times of plantation in cultivation of lettuce in Gurupi, state of Tocantins (Gurupi-to), Brazil. Acta Agron. [online]. 2020, vol.69, n.3, pp.170-178.  Epub 26-Ago-2021. ISSN 0120-2812.  https://doi.org/10.15446/acag.v69n3.73506.

Lettuce (Lactuca sativa L.) is the main leafy vegetable cultivated in Brazil. Productivity and quality are constraints related to the growing season, close environment and the type of cultivar adopted. The objective of this study was to verify, at different times, the best planting environment for growing lettuce in a semi-humid tropical climate. For this purpose, an experiment was installed at three different seasons (October - November 2014, January - March, May - July 2015). The experimental design was in random blocks, in a 3 x 3 x 2 factorial arrangement, for three seasons with three lettuce cultivars (Vera®, Tainá® and Rafaela®) and two cropping environments (low tunnel with beds protected by mulching; and beds without protection or conventional crop), with four replicates per treatment. The following were evaluated: fresh mass of the plants; stem length; head diameter; number of leaves per head; head volume; productivity. The results showed that the May/Jul period favors lettuce fresh mass, head diameter and productivity. Vera® variety is more productive for biomass, number of leaves per head, stem length and productivity despite being similar to the other varieties. The low tunnel system associated with mulching can be considered adequate under the conditions evaluated for lettuce cultivation. The May/Jul Period associated with the low tunnel with mulching presented a superior biomass production, head diameter and productivity, in relation to conventional cropping during the Oct/Nov period.

Palavras-chave : biomass; controlled environment; Lactuca sativa L.; mulching.

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