Abstract
The study aimed to evaluate the nitrogen sources and doses application effects on the dry matter production and the sugar and alcohol gross yield of sugarcane (SP80-1816) in the cane-plant cycle in a dystrophic Red Oxisol. The experiment was conducted in the Fazenda Rio Paraiso II field, belonging to Usina Raízen, in Jataí - GO. The experimental design used was randomized blocks, arranged in a factorial scheme (2 x 4), with three replications. The treatments consisted of two nitrogen sources (urea and ammonium nitrate) and four nitrogen doses (0, 60, 120, and 180 kg ha-1). Dry matter variables were analyzed in sub-subdivided plots, as four evaluation periods were added (210, 250, 290, and 330 days after planting). The evaluation periods influenced sugarcane dry matter, and urea favored these variables to the ammonium nitrate's detriment. In contrast, the opposite occurred for stalk yield and sugar and alcohol yields, in which ammonium nitrate provided greater increments. The increase in nitrogen doses provided linear gains in practically all studied variables.
Highlights
Acúmulo de matéria seca e rendimento de açúcar e álcool por cana-de-açúcar submetida a fontes e doses de nitrogênio
When analyzing the dry matter variables, it is observed that the pointer dry matter (PDM) was influenced by the interaction of nitrogen doses and evaluation times
The stalk dry matter (SDM) was influenced by the interaction between nitrog en sources and doses and the interaction of nitrogen sources and evaluated periods . (Table 2)
Summary
Acúmulo de matéria seca e rendimento de açúcar e álcool por cana-de-açúcar submetida a fontes e doses de nitrogênio. O estudo teve por objetivo avaliar os efeitos da aplicação de fontes e doses de nitrogênio na produção de matéria seca e no rendimento bruto de açúcar e álcool em cana-de-açúcar (SP80-1816), no ciclo de cana-planta, em um Latossolo Vermelho distrófico. As épocas de avaliações influenciaram na matéria seca da cana -de-açúcar e a ureia favoreceu essas variáveis em detrimento do nitrato de amônio, enquanto o inverso ocorreu para a produtividade de colmo e rendimentos de açúcar e de álcool, em que o nitrato de amônio proporcionou maiores incrementos. Introducti on Brazil retains the world's first and second place of sugarcane (Saccharum spp.) and bioethanol largest producer, respectively This crop plays an important role in the Brazilian economic and social scenario, standing out as one of the main commodities produced in the country. Among sugarcane's main positive aspects, we can highlight low production cost, high yield, low nitrogen use (N), excellent renewable energy/fossil energy balance, and good greenhouse gas mitigating potential (Cortez, 2012)
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