Journal of Food, Agriculture and Environment

Productivity and nitrate concentration in lettuce (Lactuca sativa) cultivars in the Amazon region, Brazil

Author(s):

Sávia Poliana da Silva ¹, Ismael de Jesus Matos Viégas ^{2 *}, Sérgio António Lopes de Gusmão ¹, Dioclea Almeida Seabra Silva ¹, Cândido Ferreira de Oliveira Neto ², Mário Lopes da Silva Junior ¹, Pedro Vitoriano de Araújo Júnior ³, Heráclito Eugênio Oliveira da Conceição ², Raimundo Thiago Lima da Silva ², Ricardo Shigueru Okumura ²

Recieved Date: 2015-05-26, Accepted Date: 2015-09-10

Abstract:

The aim of the study was to evaluate the growth and the concentration of nitrate in five lettuce cultivars in hydroponics under different environment of cultivation and harvest time in the Amazon region. Two experiments were conducted in the cities of Altamira and Belém, State of Pará, Brazil. In both locations the experimental design was completely randomized, with five treatments corresponding to cultivars of lettuce (Babá de Verão; Itapuã 401; Amanda; Hansom; and Mimosa Roxa) and five replicates. For the evaluation of nitrate concentration was used a factorial scheme 5 x 2, corresponding to the same five cultivars and two harvest periods, afternoon (17:00 h) and the morning (7:00 h the next day). The evaluations were performed at 55 days after planting, in which measured the following agronomic variables: mass of fresh matter (FM), mass of dry matter (DM), plant height (PH), number of leaves (NL), stem diameter (SD) and stem length (SL). The best performances for lettuce productivity were obtained by Babá de Verão and Amanda cultivars grown in the Amazon region, Brazil. The crisp lettuce Itapuã 401 cultivar, showed the highest plant height, while the Babá de Verão cultivar obtained a greater number of leaves and stem diameter. The Mimosa Roxa cultivar presented with the greatest potential to accumulate nitrate, independent the experimental site. The concentration of nitrate found in the cultivars showed no risk for human consumption, in both times of harvest in tropical conditions in the Amazon region, Brazil.

Keywords:

Soilless culture, mineral nutrition, nutritive solution

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Journal: Journal of Food, Agriculture and Environment
Year: 2015
Volume: 13
Issue: 3&4
Category: Agriculture
Pages: 107-112

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