RESUMOO objetivo do trabalho foi avaliar as características produtivas e nutricionais do capim-xaraés inoculado com bactérias diazotróficas associativas, em primeiro cultivo em Latossolo Vermelho do Cerrado. O experimento foi realizado em casa de vegetação. O delineamento experimental foi inteiramente ao acaso, constituído por fatorial 6x3: três estirpes de bactérias diazotróficas associativas (MTAz8, MTH2 e Y2), uma combinação das estirpes MTAz8 e MTH2, adubação nitrogenada e testemunha absoluta, e três cortes (30, 60 e 90 dias), em cinco repetições. A inoculação foi feita por meio da inserção de uma alíquota de 5mL de caldo bacteriano contendo 10 8 células mL -1 no solo próximo ao sistema radicular. As variáveis avaliadas foram: massa seca da parte aérea, porcentagem de proteína bruta, acúmulo e concentração de nitrogênio na parte aérea e determinação do número de bactérias diazotróficas do solo. No tratamento adubado com nitrogênio, a produção de massa seca aumentou ao longo dos cortes. Entre as estirpes de bactérias associativas, a Y2 apresentou maior acúmulo de nitrogênio e maior população de bactérias no meio de cultura LGI. As características nutricionais do capim-xaraés decaíram à medida que foram realizados os cortes. Palavras-chave: Brachiaria brizantha, fixação biológica de nitrogênio, Cerrado ABSTRACT The aim of this study was to evaluate yield and nutritional characteristics of Xaraés grass inoculated with diazotrophic associative bacteria in the first cultivation in the Cerrado
The cowpea has stood out on the national scene, opening up new perspectives and applications of a more suitable management to ensure quality product. Therefore, it is important to know the responsiveness to the levels of deficit and excess water in the soil. Thus, the aim of the present study was to evaluate the initial development of cowpea plants subjected to different soil water availabilities. The experiment was conducted in a greenhouse, in a completely randomized design with six water availabilities (40, 60, 80, 100, 120 and 140% of the maximum soil water holding capacity) with four replicates. Maintaining soil moisture was performed using gravimetric method. The results were submitted to analysis of variance and regression at 5% probability through Sisvar statistical program. The plant height, stem diameter, number of leaves, dry mass of shoots and roots were evaluated 35 days after implantation of the treatments. The water availabilities that provide better development and yield of cowpea BRS Nova Era stood in the range of 78.5 to 84.5% of the maximum soil water retention.
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