Resumo -O objetivo deste trabalho foi avaliar o efeito da utilização, em campo, de inoculantes compostos pela mistura de estirpes de bactérias diazotróficas e pelos polímeros carboximetilcelulose e amido, sobre a fixação de nitrogênio, em cana-de-açucar. O delineamento experimental foi de blocos ao acaso, em esquema fatorial 4x2, com quatro formas de fornecimento de N: controle absoluto, controle nitrogênio (adubação com 120 kg ha -1 de N), inoculante polimérico líquido (IPC 0,8), e inoculante polimérico gel (IPC 2,2); e duas variedades de cana-de-açúcar (RB72454 e RB867515), em parcelas subdivididas (três épocas de avaliação -6, 9 e 11 meses após o plantio), com quatro repetições. Como veículo inoculante foi testada a proporção 60:40 dos polímeros carboximetilcelulose e amido, nas concentrações 0,8 e 2,2 g L -1 (IPC 0,8 e IPC 2,2, respectivamente). Os parâmetros avaliados foram: a produtividade de colmos, a massa de matéria seca total e o acúmulo de nitrogênio. Os tratamentos com os inoculantes com a mistura de bactérias diazotróficas endofíticas e os polímeros promoveram aumento médio da produtividade das variedades RB72454 e RB867515 de 50 e 30 Mg ha -1 , respectivamente, e aumento médio da massa da matéria seca da variedade RB867515 de 18 Mg ha -1 , em comparação ao controle absoluto, aos 11 meses após a inoculação, e não diferiram significativamente do tratamento controle nitrogênio.Termos para indexação: Saccharum officinarum, amido, bactérias diazotróficas, carboximetilcelulose. Inoculants containing polymers and endophytic bacteria for the sugarcane cropAbstract -The objective of this work was to evaluate the effects of field application of inoculants composed of a mixture of diazotrophic bacterial strains and of carboxymethyl cellulose and starch polymers on nitrogen fixation in sugarcane. The experimental design was in randomized blocks in a 4x2 factorial arrangement: four types of nitrogen supply -absolute control, nitrogen control fertilized with 120 kg N (urea) ha -1 , polymeric liquid inoculant -IPC 0.8, and polymeric gel inoculant -IPC 2.2; and two sugarcane varieties (RB72454 and RB867515), with split plots (three harvest times -6, 9 and 11 months after planting), with four replicates. As inoculant vehicles, carboxymethyl cellulose and starch polymers with a 60:40 ratio were tested at 0.8 and 2.2 g L -1 concentrations (IPC 0.8 and IPC 2.2, respectively). The evaluated parameters were stem productivity, total dry matter and nitrogen accumulation. The treatments with the inoculants containing a mixture of diazotrophic bacteria and polymers led to an average increase of 50 and 30 Mg ha -1 in the productivity of the varieties RB72454 and RB867515, respectively, and to an average increase of 18 Mg ha -1 in total dry matter of variety RB867515, in comparison to the absolute control 11 months after inoculation, with no significant difference from the nitrogen control.
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