PRODUTIVIDADE DA SOJA EM FUNÇÃO DA ÉPOCA DA SEMEADURA E DA IRRIGAÇÃO SUPLEMENTAR NA REGIÃO CENTRAL DO RS

Abstract

 the present study aims to evaluate soybean productivity as a function of sowing time and supplementary irrigation for edaphoclimatic conditions in the central region of RS. The field experiment was installed at the Uergs Agronomic Station in Cachoeira do Sul-RS. The experimental design was a randomized block with subdivided plots, in the factorial scheme (4x2). The “A” factor constituted the four soybean sowing seasons: 23/10/19 (Season 1), 19/11/19 (Season 2), 19/12/19 (Season 3), 1/16/20 (Season 4). The “D” factor consists of two water regimes: irrigated and non-irrigated (rainfed). A cultivar used for BMX Garra. The productivity of irrigated soybeans was greater than 4200 kg ha^-1 for sowing times between October and December, with a maximum productivity of 4563.83 kg ha^-1 for sowing in November, a reduction of 60% in sowing in January. The rainfed soybean was more influenced by the sowing time, the maximum productivity increased from 3587.28 kg ha^-1 for sowing in October with a reduction of approximately 30 kg ha^-1day^-1 with the sowing delay, reaching 67% reduction in productivity with safrinha sowing (January).