Abstract
A greenhouse experiment was carried out with the objective to evaluate the response of three lettuce types (cultivars: Regina, Veronica, and Lucy Brown) grown on two soils (Paleudult and Hapludox), to phosphorus fertilization. It was used a complete randomized design with three replications of treatments in a factorial arrangement 5 x 3 x 2 (five rates of P, three cultivars, and two soils). The rates of phosphorus were: 0, 25, 50, 100, and 150 mg kg-1. Dry matter and phosphorus contents were determined in soil and on plant shoots 48 days after emergency plants. A significant yield response to phosphorus fertilization was observed. The Lucy Brown cultivar was more productive than ‘Regina’ and ‘Veronica’. The letucce grown on Hapludox tended to have higher yield of dry matter. Among the cultivars, it was not verified significant differences in the P concentrations in plant shoots. The appearing of phosphorus deficiency symptoms in lettuce were associated with P contents on plant shoots lower than 2.3 g kg-1.
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