The agronomic characteristics and technological properties of the cotton 'IAC 20' in response to urea and ammonium sulfate applications were evaluated. These evaluations were made in three years, involving sixteen field plots. Rates of 0, 25, 50, 75 and 100 kg/ha of N were used in a factorial design 2 x 5, with four replications in randomized blocks. In continuously fertilized soil, where the reaction to nitrogen is high in terms of productivity, it was demonstrated that the fertilization with ammonium sulfate and urea improved the agronomic characteristics (boll weight and seed weight) and tecnological properties of cotton fibers (length, length uniformity, Micronaire index, maturity and strength fiber). In the present study, the behavior of the ammonium sulfate and urea was similar.
cotton; Gossypium hirsutum L.; fiber quality; nitrogen fertilizers; agronomic characteristics