Inga edulis Mart. is a leguminous tree adapted to acidic and low-fertility soils that establishes symbioses with nitrogen (N)-fixing bacteria. The identification of effective bacteria in biological N fixation may bolster the use of I. edulis in degraded or modified areas and agroforestry systems. Therefore, the aims of this study were evaluation of the symbiotic effectiveness of eight strains of the Bradyrhizobium genus native to Roraima in Inga edulis plants, and in vitro evaluation of the ability of the eight strains of Bradyrhizobium to develop plant growth-promoting characteristics. Determination of symbiotic effectiveness was carried out via three experiments: the first in a greenhouse in pots with a sterile substrate; the second in a greenhouse in pots containing non-sterile soil; and the third in a nursery in bags with a non-sterile substrate. Twelve treatments were evaluated: inoculation with eight strains of Bradyrhizobium ingae (ERR 490, ERR 492, ERR 493, ERR 494 T , ERR 496, ERR 497, ERR 498, and ERR 569); inoculation with two strains indicated for Inga marginata, BR 6609 and BR 6610 (positive controls); no inoculation but with mineral N; and neither inoculation nor mineral N. All of the experiments were conducted in a completely randomized design with four replicates. The first experiment was conducted for 60 days, and the other experiments were conducted for 100 days. For all of the experiments, the number of nodules, nodule dry matter, root dry matter, shoot dry matter, number of leaflets, plant height, stem diameter, total N in the shoots, root/shoot dry matter ratio, Dickson's quality index, relative effectiveness, and the Pearson correlation between the variables under study were evaluated. The strains were also evaluated by their ability to solubilize calcium and aluminum phosphates and to produce indolic compounds. The results showed that B. ingae strains were effective in biological N fixation, especially the ERR 493, ERR 498, and ERR 569 strains. These strains increased the production of shoot dry matter and total N and exhibited relative effectiveness higher than 100 % in all of the experiments. The B. ingae strains were also able to solubilize calcium and aluminum phosphates, despite their synthesis of indolic compounds. Thus, the strains of B. ingae can be used for inoculation in the production of I. edulis seedlings.
A produção de melancia é consolidada em todas as regiões do Brasil. Porém, as informações sobre produtividade e qualidade dos frutos, de diferentes cultivares no mesmo ambiente, ainda são tímidas, sobretudo em Roraima, tornando necessária a realização de estudos para suprir essa carência. Objetivou-se com o presente trabalho avaliar o desempenho agronômico de cultivares de melancia cultivadas nas condições do cerrado de Boa Vista, Roraima. O experimento foi desenvolvido em condições de campo , entre os meses de dezembro de 2013 e fevereiro de 2014. O delineamento experimental utilizado foi o de blocos ao acaso, com seis repetições. Os tratamentos consistiram de seis cultivares de melancia, quais foram: Verena, Explore, Elisa, Juliane, Crimson Sweet e Crimson Sweet Super. Avaliaram-se características agronômicas e de qualidadedos frutos. Não houve diferença entre as cultivares quanto a produtividade, número de frutos por hectare e número de frutos com massa entre 6 e 9 kg por hectare. As cultivares diferenciaram-se quanto às características físicas (massa, dimensão e número de sementes por fruto). Houve diferença entre as cultivares para todas as características químicas e físico-químicas dos frutos. A cultivar Elisa apresentou maior teor de sólidos solúveis totais (12,58 ºBrix). Os frutos das cultivares Explore e Crimson Sweet Super apresentaram maior relação entre os teores de sólidos solúveis totais e acidez titulável. Os frutos das cultivares Explore e Elisa apresentaram maior pH. As condições edafoclimáticas do cerrado de Boa Vista - RR favorecem a produção e qualidade dos frutos das cultivares avaliadas.
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