English

Oliveira De Assis Wesley,Francyne Gomes Chaves Lívia,Jairo Florentino Cordeiro Junior Jose,Thalita De Almeida Souza Rayanne,Dos Santos Medeiros Lucas,Correia De Araújo Neto Joao,Luciano De Andrade Melo Junior Joao,Camylla De Moura Assis Sara,Caroline De Melo Morais Ana,Bruna Ferreira Soares Larice,Danilo Ferreira De Andrade Melo Luan,De Alencar Paes Reinaldo

doi:10.5897/ajar2019.14152

Abstract

The present work aimed to evaluate the germination, emergence, vigor and initial development of lettuce (Lactuca sativa L.) cultivars. Nine cultivars belonging to the crespa group, Cinderella, Monica SF 31, Mimosa (Salad Bowl), Veneranda, Brava, Cerbiatta (Catalonha), Itapua Super, Itauna Prisee, Simpson and Vitoria de Verao were used. The experiment was conducted to ensure the accuracy of the comparisons. The variables analyzed were: Germination, emergence, first germination and emergency counting, mean germination and emergency time, mean germination and emergence velocity, germination and emergency uncertainty index, germination and emergency synchrony, and relative frequency of germination and emergency. In order to obtain the emergency data, it was necessary to use a refrigerated room to give optimal conditions for the seeds and in the initial stage, an acclimatization for a salable development of newly emerged seedlings. For experimental design, completely randomized (CRD) was used for laboratory conditions and randomized blocks (RB) for the field, with four replicates of 25 seeds per treatment. The data were submitted for analysis of variance (ANOVA) and the means were compared by the Tukey test at 5% probability. The analyses were carried out using SISVAR software 5.6. Cultivar Itauna obtained the best results in physiological quality evaluations, being recommended for planting in regions of Northeastern Brazil. Key words: Lactuca sativa L., germination, emergence.

Highlights

Lettuce (Lactuca sativa L.) belongs to the family Asteraceae, being one of the vegetables of greater expression in the world
The data were submitted for analysis of variance (ANOVA) and the means were compared by the Tukey test at 5% probability
Cultivar Itaúna obtained the best results in physiological quality evaluations, being recommended for planting in regions of Northeastern Brazil

Summary

Introduction

Lettuce (Lactuca sativa L.) belongs to the family Asteraceae, being one of the vegetables of greater expression in the world. In Brazil, lettuce is the third most produced vegetable, occupying around 90,000 ha and moving billions of reais annually, being the hardwood vegetable of greater value, both in quantity and in commercialized price (ABCSEM, de Assis et al.2012). Its cultivation is usually practiced by family farming, employing a large number of labor in the field. It has been cultivated in different times and places, in different soil and climatic conditions, and during the most critical period of the culture (which is the germination and seedling emergence), the producer has not always full control of these conditions (Araujo et al, 2010)

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