| Summary: | Orientador: Adalton Mazetti Fernandes === Banca: Dirceu Maximino Fernandes === Banca: José Carlos Feltran === Resumo: Uma tecnologia que permite reduzir a adubação nitrogenada mineral aplicada nas culturas é a inoculação das plantas com Azospirillum brasilense, uma bactéria que proporciona benefícios para as plantas que vão além da fixação biologia do nitrogênio atmosférico (N2). Dessa forma, o objetivo deste trabalho foi avaliar o estado nutricional, o acúmulo de matéria seca (MS), a partição de carboidratos e açúcares redutores, a produtividade e a eficiência de uso do N absorvido pelas plantas de mandioca e batata em resposta a inoculação de Azospirillum brasilense em combinação com a adubação nitrogenada. Foram conduzidos quatro experimentos, ou seja, dois em solo natural e dois em solo estéril envolvendo as culturas da batata e da mandioca. Para cada experimento o delineamento experimental utilizado foi o de blocos ao acaso, no esquema fatorial 2x4, com quatro repetições. Nos experimentos com mandioca (solo natural e estéril) os tratamentos foram representados por 2 formas de fornecimento de Azospirillum brasilense (1 - Com aplicação de Azospirillum brasilense; 2 - Sem aplicação de Azospirillum brasilense), combinadas com quatro doses de N (0, 50, 100 e 200 mg dm-3 de N). Nos experimentos com batata (solo natural e estéril) as formas de inoculação de Azospirillum brasilense foram as mesmas da mandioca, mas as doses de N foram de (0, 75, 150 e 300 mg dm-3 de N). Cada parcela foi representada por um vaso de 38 dm3 contendo uma planta de mandioca e para a batata foi utilizado vasos de 25L.... (Resumo completo, clicar acesso eletrônico abaixo) === Abstract: One technology that reduces nitrogen fertilization applied in crops is the inoculation of plants with Azospirillum brasilense, a bacterium that provides benefits to plants that go beyond fixing biology of atmospheric nitrogen (N2). Thus, the objective of this work was to evaluate the nutritional status, dry matter accumulation (DM), carbohydrate and reducing sugar partition, productivity and N use efficiency absorbed by cassava and potato plants in response to inoculation of Azospirillum brasilense in combination with nitrogen fertilization. Four experiments were conducted, ie two in natural soil and two in sterile soil involving the potato and cassava crops. For each experiment, the experimental design was a randomized block design in the 2x4 factorial scheme, with four replications. In the experiments with cassava (natural and sterile soil) the treatments were represented by 2 forms of Azospirillum brasilense (1 - With application of Azospirillum brasilense), combined with four doses of N (0, 50, 100 and 200 mg dm-3 of N). In the experiments with potato (natural and sterile soil) the inoculation forms of Azospirillum brasilense were the same as those of cassava, but the N doses were 0, 75, 150 and 300 mg dm-3 of N. Each plot was represented by a 38 dm3 vessel containing a cassava plant and 25L vessels were used for the potato. The soil sterilization was performed in an autoclave. In cassava, N doses were applied half at 15 and half at 40 days after emergence and in potato N was split between 1/3 at planting, 1/3 at 15 and 1/3 at 40 days after emergence. In the treatments with inoculation of Azospirillum brasilense, 20 ml of the commercial product (Nod) containing 2.0 x 108 viable cells per ml of the Ab-V5 and Ab-V6 strains were applied. Therefore, it is recommended inoculation of A. brasilense for cassava cultivation, since it increased productivity when inoculated with the bacterium, among ... === Mestre
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