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The present work aimed to analyze the phenological behavior of soybean cultivars in different sowing dates in lowlands, determining plant height, cycle duration and development subperiods. The experiment was carried out in the experimental area of the Federal Institute Farroupilha - Sao Vicente do Sul Campus, and consisted of six soybean cultivars. The experimental design was randomized blocks with four replications. Three sowing dates were performed (10/19, 11/29 and 12/29/2018). The plot consisted of six rows with 5 meters in length and spacing of 0.45 m between rows, at a density of 30 plants/m. For the phenological monitoring, two plants were demarcated per plot, and their phenological stage was evaluated twice a week. Plant height was determined after the plants reached physiological maturity. The analysis of variance was performed to verify if there was a difference between the analyzed variables, applying the Tukey test (P = 0.05) for comparison of means. The analysis of variance showed that there was interaction of the factors sowing time and cultivar for all variables. Therefore, different sowing times influence plant height, cycle duration and crop development subperiods. Keywords: Phenology; Sowing Dates; Lands casualties.

Fenologia de cultivares de soja em diferentes datas de semeadura em terras baixas