RESUMO Este trabalho teve como objetivo analisar a existência de disparidades e similaridades raciais entre professores e suas turmas no Brasil. Em complemento, buscou identificar se tais disparidades e similaridades raciais exercem influência nas expectativas dos docentes que lecionam no 9º ano do ensino fundamental e na 3ª série do ensino médio das escolas públicas brasileiras no ano de 2017. Para tal, foram estimados modelos multiníveis com base nos microdados oriundos do Sistema de Avaliação da Educação Básica. Os resultados apontaram que a cor da pele exerce papel importante na determinação das expectativas dos professores, particularmente com relação à similaridade racial entre professores e suas turmas. Brasil complemento º ª 2017 tal Básica 201 20 2

RESUMEN Este estudio tiene como objetivo analizar la existencia de disparidades y similitudes raciales entre los profesores y sus clases en Brasil. Además, busca identificar si estas disparidades y similitudes raciales influyen en las expectativas de los profesores que enseñan en el 9º año de primaria y el 3º año de secundaria en las escuelas públicas brasileñas en 2017. Para ello, se estimaron modelos multinivel utilizando microdatos del Sistema de Evaluación de la Educación Básica (SAEB). Los resultados muestran que el color de la piel desempeña un papel importante en la determinación de las expectativas de los profesores, en particular con respecto a la similitud racial entre los profesores y sus clases. Brasil Además º 2017 ello SAEB. SAEB . (SAEB) 201 (SAEB 20 2

ABSTRACT This study aimed to analyze the existence of racial disparities and similarities between teachers and their classes in Brazil. In addition, it sought to identify whether these racial disparities and similarities have influence on the expectations of teachers who teach in the 9th year of elementary school and in the 3rd grade of high school in Brazilian public schools in 2017. To this end, multilevel models were estimated using microdata from the Basic Education Assessment System. The results showed that skin color plays an important role in determining teachers’ expectations, particularly regarding racial similarity between teachers and their classes. Brazil addition th rd 2017 end System 201 20 2

Symbiosis of common bean with nitrogen-fixing bacteria can lead to a reduction in production costs and in environmental impacts. Considering the diversity of soils and climates, it is important to validate bacterial strains under different conditions to consolidate their recommendation as inoculants. Studies concerning the economic viability of Rhizobium inoculation in common bean are few, but they could assist in choosing the strain to be adopted. The aim of this study was to evaluate the performance of Rhizobium strains isolated from acid soils from the Amazon inoculated in seeds of the BRSMG Madrepérola cultivar and to evaluate the economic viability of their use in the field. Four field experiments were conducted in the state of Minas Gerais, Brazil. A randomized block experimental design was used with four replications and seven treatments: inoculation with the strains CIAT 899 (Rhizobium tropici), UFLA 02-100 (R. etli), UFLA 02-68 (R. etli bv. mimosae), UFLA 02-127 (R. leguminosarum bv. phaseoli), and UFLA 04-173 (R. miluonense),plus two controls, one without inoculation + mineral nitrogen (N-urea) at a rate of 80 kg N ha-1 and another without inoculation and without mineral N. The strain CIAT 899 is already recommended for the manufacture of a commercial inoculant, and the others, collected in the Amazon Forest, have proven to be highly effective in biological nitrogen fixation. Symbiosis of common bean with all the strains evaluated leads to satisfactory yields, with reduction in the application rate of mineral nitrogen and in environmental impacts and, consequently, reduction in economic costs, with higher profitability.