There exist a lack of information about the fertilization of vegetables where occurr an increase of the vegetative cycle, when the seeds production is the final purpose. The influence of potassium rates was evaluated in lettuce cultivar Verônica for yield and quality of seeds. The experiment was conducted in randomized complete blocks, with five treatments (0,0; 1,0; 1,5; 2,0 e 2,5g plant-1 of K2O) and six replications. The data were submitted to the variance analysis and to the regression analysis. The K2O rates resulted in a linear increase in the seed yield (mass and number) but did not affect the seed quality.
Lactuca sativa L.; potassium fertilization; K2O; germination; vigor
