Instituto Federal do Amapá

A dinâmica agropecuária de Guanambi, no sudoeste da Bahia, destaca-se pela predominância da agricultura familiar, essencial para o abastecimento alimentar e a economia local. A produção, voltada principalmente para o consumo interno, encontra-se na feira livre municipal um importante canal de comercialização e um espaço de convivência entre o meio rural e urbano. A localização das propriedades rurais em relação ao centro urbano influencia diretamente os custos logísticos e o escoamento da produção. Considerado um fator estratégico nesse cenário é a Barragem de Ceraíma, que assegura o fornecimento de água para irrigação, possibilitando a diversificação agrícola, mesmo em condições de clima semiárido. O fortalecimento dos agricultores tem sido promovido por organizações sociais locais, como sindicatos e centros de agroecologia, que incentivam práticas sustentáveis e colaboram para o desenvolvimento rural da região. Contudo, desafios persistem, especialmente relacionados à degradação do solo e à gestão inadequada dos recursos naturais, evidenciando a necessidade de uma transição para modelos produtivos sustentáveis. Assim, a agropecuária em Guanambi apresenta um panorama marcado pela interação entre tradição, inovação e resiliência, evidenciando os esforços contínuos para manter a vitalidade da vida rural no sertão baiano.

Waste deposits from the Iberian Pyrite Belt that are rich in pyrite are a valuable secondary resource for getting back sulphide minerals and important metals that go with them. This study assessed the efficacy of a Multi-Gravity Separator (MGS) in concentrating pyrite and related polymetallic minerals from sulphide waste material sourced from the Alonso mining district (Huelva, Spain). Bench-scale MGS tests were done on two particle size fractions (−500 µm and −50 µm) to see how the speed of the drum rotation, the angle of the tilt, and the flow rate of the wash water affected the separation efficiency. Mineral Liberation Analysis (MLA) showed that both size fractions had about 65.8 wt% pyrite, but the −50 µm fraction was much more liberated. Under the best operating conditions, the MGS was able to recover about 58% of the pyrite from the −500 µm fraction and about 64% from the −50 µm fraction. The mass recoveries were about 38% and 42%, respectively. There was also a better recovery of related metals like Co, Cu, Zn, and Mn, especially for the finer fraction. This shows the improvement of the liberation and stratification behaviour. The results show that MGS is a good way to pre-concentrate fine-grained pyrite-rich waste. The performance is heavily influenced by the size distribution of the particles and the operating parameters. These results suggest that improvements in gravity separation may offer a long-term pathway for the recycling of sulphide mine waste within a circular economy.

This study aims to identify the dynamics employed in solid waste management in the agroextractivist community São Francisco do Iratapuru Sustainable, situated in the Jari River Watershed, in the state of Amapá - Brazil. The research focuses on the perception of community leaders regarding solid waste management, considering the specific challenges faced by this community located in a territory accessible only by river. Data collection was conducted through semi-structured interviews with recording and subsequent transcription of dialogues, including aspects such as management, challenges, and expectations. These data were interpreted through content analysis, structured into categories as proposed by Bardin. The analysis of respondents’ answers reveals a complex situation in solid waste management, considering that, due to the difficult access to the area, material cannot be transported, and the limitations of a protected unit do not allow an extension of the distance to its destination.

Este artigo apresenta o LogicProg, um aplicativo para auxiliar na aprendizagem em lógica de programação por meio de recursos de inteligência computacional. O aplicativo promove a divulgação da lógica de programação, por meio de recursos e conteúdos organizados e alinhado à BNCC. O App foi criado na plataforma FlutterFlow e Linguagem de programação Dart, possuindo funcionalidades e serviços independentes. O App foi desenvolvido para dispositivos móveis, para o sistema operacional Android. A utilização da aplicação demonstrou potencial do produto para aprendizagem em lógica e linguagem de programação.

ABSTRACT The carambola fruit fly (CFF) ( Bactrocera carambolae Drew & Hancock) is one of the most harmful pests of fruit production. It is an exotic species in Brazil, restricted to the northern region (Amapá, Pará, and Roraima States), and a threat to the national fruit production and exportation. The oviposition activity of this pest is not well known, imposing barriers to understanding its host attack in the field. We aimed to evaluate the daily pattern of oviposition in B. carambolae and compare the number of eggs at different female densities (one couple, five couples, and 15 couples) from 07:30 a.m. to 5:30 p.m. We also compared their oviposition depth on different substrates (guava and an artificial substrate). Data were analyzed using a generalized linear mixed model (GLMM) on the software RStudio. Our results showed that B. carambolae exhibits a distinct pattern of oviposition activity at different densities during the day, with no preferential oviposition period at higher density. However, increasing density did not affect the number of eggs laid per female during the day. We did not find a significant difference when comparing the oviposition depth of CFF on a guava piece and an artificial device. Our results improve knowledge about the oviposition activity of B. carambolae and suggest that its species adopt oviposition strategies to ensure their offspring.

Abstract Common bean ( Phaseolus vulgaris L.) is considered a staple of the Brazilian diet and one of the most important grains in the diets of populations in several countries across Latin America, Africa, and Asia, as it is an excellent source of proteins, vitamins, carbohydrates, minerals, and fiber. This study aimed to evaluate the adaptability and stability parameters of grain yield in black common bean using methods based on analysis of variance, as well as simple and two‐segment linear regression. The trials were conducted using a randomized block design with three replicates, in three municipalities, in 2016 and 2017, totaling six environments. Each experimental unit consisted of four 4‐m‐long rows, spaced 0.5 m apart, totaling a population of 240,000 plants ha −1 . The usable area comprised the two central rows, excluding 0.5 m from each end, totaling 3 m 2 . Six genotypes, including four elite lines, had yields above the overall mean and were considered the best adapted. The methodologies proposed by Eberhart and Russel, Wricke, Lin and Binns, and Cruz et al. showed agreement in identifying the Centro Nacional de Pesquisa em Feijão Preto (CNFP) 15684 inbred line as having broad phenotypic stability. The Eberhart and Russel method was effective in identifying genotypes with broad adaptability and high phenotypic stability, indicating the CNFP 15685 genotype for cultivation in the north and northwest regions of Rio de Janeiro. No ideal genotype—that is, one that is productive, adapted to unfavorable environments, responsive to environmental improvement, and highly stable—was identified by the method of Cruz et al.

Climate change may soon impact popcorn productivity. The aim was to assess physiological and growth traits in two popcorn genotypes with different water use efficiency under water-deficit stress. The plants were grown in a greenhouse under either water stress (WS) or non-water stress (WW) conditions. Gas exchange, chlorophyll fluorescence, and leaf temperature were assessed every three days, for a total of nine measurements. At the end of the assessment period, growth traits and the SPAD index were evaluated. Our hypotheses were as follows: (a) plants of the P7 genotype (water-efficient agronomic genotype) would take longer than L65 plants (water-inefficient agronomic genotype) to reduce photosynthetic rates under water stress conditions; (b) after re-irrigation, P7 plants would recover photosynthetic capacity with values similar to the period without water stress; and (c) P7 plants would recover photosynthetic capacity faster than L65 plants when subjected to the same period of water stress. The P7 genotype (agronomic water-efficient genotype) absorbed water more quickly due to higher root biomass, root length, and root volume. Yet, at 14 days after suspending irrigation (DASI), the P7 genotype had the lowest net CO2 assimilation rate (Anet), stomatal conductance (gs), and transpiration rates (E) values. However, L65 (agronomic water-inefficient genotype) had the lowest Anet, gs, and E values only at 17 DASI. As a consequence of stomatal closure in both genotypes, the E rates were reduced, and there was an increase in leaf temperature for WS plants, while L65 had higher leaf temperature at maximum water stress. No photochemical damage was detected, indicating that the reduced Anet in WS was likely due to stomatal limitations and biochemical disturbances in both genotypes. Photosynthetic recovery occurred gradually, with full restoration of rates in both genotypes at the end of the experiment. Although our initial hypothesis expected the P7 genotype to maintain photosynthesis longer under water stress, our findings showed an earlier decline in Anet compared to L65. This result is likely due to the large root system of P7 exhausting the limited soil water more rapidly in pot conditions, accelerating the onset of stress.

Este dossiê é o eco insurgente e a memória viva do III Encontro Decolonialidade, Feminino e Negritude, realizado nos dias 18 e 19 de dezembro de 2024. Fruto da confluência de pesquisadoras e pesquisadores irmanados pelo compromisso radical com a de(s)colonização do pensamento, da escrita e da própria vida, esta publicação celebra os quatro anos de caminhada acadêmica e política do Grupo de Pesquisa “De(s)colonizando mentes femininas em territórios afrodiaspóricos”. Uma trajetória tecida em parceria fundamental com o Centro Latino-Americano de Estudos em Cultura (CLAEC), espaço que acolhe e amplifica estas vozes.