Desempenho agronômico de cultivares de alface em sistema hidropônico no município de Uruçuí - PI

Abstract

There is a lack of information on more productive cultivars adapted to the hydroponic cultivation of lettuce in the climatic conditions of the municipality of Uruçuí-PI. Usually, the producer acquires seeds from cultivars available in commercial establishments in the city, but they are not always the most suitable for the region, resulting in low yields and in some situations, occurring early weighing in the cultivation, hindering the development of alfaciculture in the municipality. Given the above, the objective of this study was to evaluate the agronomic performance of four crisp lettuce cultivars grown in hydroponics in two growing seasons in the municipality of Uruçuí-PI. Two experiments were carried out in a hydroponic system of the NFT type (Nutrient Film Technique) at the Federal Institute of Education, Science and Technology of Piauí, Campus of Uruçuí-PI. Experiment I (first season: summer) was carried out from December / 2017 to February / 2018 and experiment II (second season: winter) from June to August 2018. In both experiments, a randomized block design was adopted , with four treatments and six repetitions. The treatments consisted of the cultivars: Vanda, Milena, Elba and Isabela. Each experimental plot consisted of 8 plants, with 4 plants being evaluated. The following characteristics were evaluated: number of leaves, fresh and dry mass, aerial part and root and length of aerial part, root and stem. The data obtained were submitted to analysis of variance (F test), when denoted significant effect, the cultivar averages were compared by the Tukey test (p <0.05). The cultivars Elba and Milena had the best agronomic performance for the first growing season, while for the second season, the cultivar Elba stood out for most of the evaluated characteristics. However, the cultivar Elba was susceptible to early weighing in both growing seasons.