Resposta do abacaxizeiro 'Vitória' a doses de nitrogênio em solos de tabuleiros costeiros da Paraíba

informations about fertilization and mineral nutrition of the new fusariosis-resistant pineapple cultivars are still scarce, despite the importance of this crop. the purpose of this study was to evaluate the effect of increasing doses of n on fruit yield and quality of the pineapple cultivar 'vitória' grown on a 'humilúvico espodossolo' in the region of tabuleiros costeiros, in the state of paraíba. the experiment was arranged in a randomized block design, using five n doses (100, 200, 300, 500 and 600 kg ha-1n, as urea) applied 60, 180 and 270 days after planting (dap) with three replications. the following variables were evaluated: length and fresh matter of the 'd' leaf; contents of n, p and k in the portions with and without chlorophyll, 300 and 420 dap; average weight, yield, physical properties (fruit weight, length and medium diameter; crown weight and length) and chemical properties (ph, soluble solids -ss, titrable acidity - at, and the ss/at ratio) of the fruits at harvest. increasing n doses linearly increased length and fresh matter of the 'd' leaf and n content and decrease both p and k contents of the chlorophyll portion 300 dap, but did not affect nutrient contents 420 dap; in the chlorophyll-free portion. increasing n doses, also, led to an increase in k contents 320 dap, but to reductions 420 dap. individual fruit weight and total yield increased with increasing n doses, as maximum values of 1.0 kg and 37.9 t ha-1 were estimated at doses of 409.0 and 439.0 kg ha-1 n, respectively. the n doses did not affect the fruit quality properties, which were compatible with the characteristics described for this cultivar.