The objective of this study was to evaluate the effect of temperature on germination and vigor of the seeds of different lettuce cultivars. It was used a completely randomized design in a factorial arrangement 4x3, with four cultivars (American, Crespa para Verão, Mimosa Salad Bowl, and Crespa Repolhuda) and four temperatures (20, 25, 30 and 35°C), with four replicates per treatment. The effects of the treatments were evaluated by germination and vigor tests (first count, germination speed index). There was influence of the lettuce grow crops on germination and seed vigor. The cultivars of the lettuce have a higher germination and vigor when exposed to 20°C, and the Crespa for daylight showed itself more tolerant to temperatures of 25 to 30°C. The temperature of 30°C inhibits the germination of lettuce seeds of the Americana, Mimosa Salad bowl and Crespa Repolhuda cultivars

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The objective of this study was to evaluate the efficiency of nitrogen fertilization associated with water-retaining as to the quality of lettuce seeds at different moisture levels. The experimental design used was composed of randomized blocks, in a 2 x 5 + 1 factorial scheme, with two moisture levels (50 and 75% field capacity) and five doses of nitrogen (0, 25, 50, 100 and 200 kg ha-1, with the addition of water-retaining gel, besides an additional treatment, without gel addition, with moisture at a level of 100% field capacity and standard nitrogen fertilization (100 kg ha-1), which will consist of the control treatment, with five replications. The analyzed variables were: water content, germination, germination speed index, electrical conductivity, and accelerated aging. The evaluated factors showed no significant interaction, for most of the analyzed variables, with the exception of the germination speed index. For germination, there was significant effect for the ‘levels of moisture in the substrate’ factor. Comparing the means of the treatments with the control, for electrical conductivity, all treatments had lower EC values, which indicate better vigor. It is concluded that using water-retaining gel associated with nitrogen fertilization allows the use of lower levels of moisture in the substrate (50%), without affecting the quality of the produced seeds. N doses fr