Biblioteca Digital de Teses e Dissertações. https://repositorio.ufra.edu.br/jspui/handle/123456789/16 2026-10-16T04:51:29Z 2026-10-16T04:51:29Z ALMEIDA, Aylana Cristina Lima de https://repositorio.ufra.edu.br/jspui/handle/riufra/2943 2026-10-15T22:10:26Z 2026-10-05T00:00:00Z

Título: Fatores motivacionais associados à intenção de movimentação de pessoal na Universidade Federal Rural da Amazônia Autor(es): ALMEIDA, Aylana Cristina Lima de Abstract: The objective of this study was to analyze the motivational factors that influence the intention to change positions among faculty and administrative staff (TAEs) at the Federal Rural University of the Amazon (UFRA), considering both the intention to transfer to another position and the intention to leave the institution. The study falls within the research area of Public Administration and Organizations, contributing to the debate on staff retention and mobility in the context of multicampus federal public universities. The theoretical framework of the study integrated the premises of the main classical and contemporary theories of motivation within the field of Public Administration. This is an applied, descriptive study with a quantitative-qualitative approach, utilizing a semi-structured electronic questionnaire administered to a sample of 169 active staff members—including faculty and technical and administrative staff—whose responses were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM), multigroup analysis, and content analysis. The results from the overall sample of civil servants demonstrated that the intention to leave temporarily is primarily associated with the physical conditions and physical safety of the work environment, while the intention to leave permanently was not significantly explained by the variables analyzed. The multigroup analysis showed that, among administrative staff, the intention to leave is strongly influenced by limitations in training, development, and education, given the link to career advancement, while among faculty members, structural and academic support constraints are more closely associated with the intention to leave permanently. The qualitative analysis indicated that retention is related to job stability, attachment to work, and interpersonal relationships, whereas departure is linked to weaknesses in infrastructure, management, and institutional working conditions. The originality of this research lies in demonstrating the determinants of internal mobility and departure at a multi-campus university in the Amazon, with a comparison between faculty members and administrative staff. As a practical contribution, the findings offer concrete insights into the formulation of policies regarding human resources management, infrastructure, and professional development, with potential impacts in the organizational, practical, scientific, and public policy spheres.

2026-10-05T00:00:00Z RODRIGUES, Possidônio Guimarães https://repositorio.ufra.edu.br/jspui/handle/riufra/2942 2026-10-15T21:50:58Z 2026-09-30T00:00:00Z

Título: Atributos químicos do solo e crescimento vegetal em latossolo vermelho-amarelo sob reflorestamento com paricá em Tailândia, Pará, Brasil. Autor(es): RODRIGUES, Possidônio Guimarães Abstract: Forestry in the Amazon region appears as promising activity, since the rational management of forests enables the provision of forest resources without the commitment of nature reserves. In the county of Thailand, northeast of Pará, much of the original vegetation has been removed in recent years, and currently these altered areas are being reforested. Through a partnership with the Museu Paraense Emilio Goeldi, timber companies in the region promote research into the sustainability of the process, aiming to prove the efficiency of the systems and techniques used in reforestation. The objective of this proposal to evaluate the influence of tillage systems on productivity of the Paricá (Schizolobium amazonicum Huber ex Ducke)] in forest systems. Therefore, we carried out the chemical characterization of soils altered by timber enterprises undergoing reforestation process with Paricá, and also the assessment of the growth of the culture. The experimental area has three ha belongs to the company GM SUFREDINI INDUSTRIAL LTDA.. The experimental design was completely randomized with three treatments, equivalent to planting systems, S1 [Paricá x Pueraria (Pueraria phaseoloides)], $2 [Paricá x Acacia (Acacia mangium)] and S3 (Paricá single), and three plots, corresponding repetitions. Chemical analyzes of soil were made: pH in water (pH), Total Carbon (C), Total Nitrogen (TN), Potassium (K), calcium (Ca), magnesium (Mg), aluminum (Al) extractables and acidity potential (H+ Al); sampling occurred, collecting four single samples per plot at depths 0-10, 10-20 cm, totaling 24 samples per planting system. To evaluate the development of Paricá was used to measure dendrometric DBH (diameter at breast height 1.30 m). The plants were measured with approximate age of 05 years, being 352 observations per planting system. It was observed higher levels and saturation of exchangeable bases in systems S1 (2,77 cmol, dm³ and 47,86%) and $3 (3,06 cmol, dm³ and 57,53%), suggesting better fertility in relation to the system S2 (1,83 cmol, dm³ and 36,10 %). The system $2 has presented higher exchangeable acidity (0,43 cmol, dm³) and potential acidity (3,47 cmol, dm³), and low nutrient availability. Regarding the diametral growth of the Parica, it was observed a higher average in the system S2 (16,62 cm), however, this system showed a less survival rate (73,86%).

2026-09-30T00:00:00Z LIMA, Leidiane de Cássia de Sousa https://repositorio.ufra.edu.br/jspui/handle/riufra/2941 2026-10-15T21:39:48Z 2026-09-25T00:00:00Z

Título: Resposta morfogênica de explantes de açaizeiro para regeneração de plantas in vitro Autor(es): LIMA, Leidiane de Cássia de Sousa Abstract: Euterpe oleracea Mart., a palm species native to the Amazon region, can be propagated sexually by seeds or vegetatively, with seed propagation being the most widely used method for commercial seedling production. Because this species is open-pollinated, the clonal propagation of selected genotypes for breeding purposes is largely restricted to the production of basal shoots. Therefore, in vitro culture may provide an alternative to conventional propagation methods, particularly because it enables the large-scale production of plants under aseptic conditions within a limited space. In this context, this study aimed to evaluate the morphogenic potential of different explants of E. oleracea cultured in vitro under different concentrations of auxins and cytokinins. Four independent experiments were conducted using different explant types and plant growth regulators. In Exp. I, immature zygotic embryos were cultured on MS medium supplemented with BAP (0, 1, or 2 mg L⁻¹). In Exp. II, immature zygotic embryos were cultured on MS medium supplemented with 2,4-D (0, 5, or 10 mg L⁻¹). In Exp. III, leaf segments were cultured on MS medium supplemented with 2,4-D (0, 2.5, 5, 7.5, 10, 12.5, or 15 mg L⁻¹). In Exp. IV, shoot apices were cultured on MS medium supplemented with BAP (0; 2,5; 5; 7,5 mg L⁻¹), NAA (0; 0,1 mg L⁻¹), or combinations of both(2,5 +0,1; 5+0,1; 7,5+0,1 mg L⁻¹). All MS media were supplemented with 30 g L⁻¹ sucrose, 2 g L⁻¹ activated charcoal, and 2 g L⁻¹ Phytagel®. The experiments were arranged in a completely randomized design with ten replicates per treatment, with each tube containing one explant considered an experimental unit. The experiments were conducted for 150 days, and the data were analyzed using generalized linear models, followed by mean comparisons using Tukey’s test (p ≤ 0.05). In Exp. I, some explants showed root formation only (10% in the presence of 2 mg L⁻¹ BAP), whereas others showed shoot formation only (10% in the absence of BAP and 10% in the presence of 1 mg L⁻¹ BAP). Root and shoot formation occurred simultaneously in 30% of the explants cultured with 1 mg L⁻¹ BAP. In Exp. II, callus formation was observed in 10% of the explants in the control treatment and in 10% of those cultured with 10 mg L⁻¹ 2,4-D. In Exp. III, no callus formation was observed in immature leaf segments at any of the concentrations evaluated. In Exp. IV, neither adventitious bud nor shoot formation was observed, and the morphological response was restricted to apical elongation, which occurred in 0–40% of the explants, with no significant differences among treatments. Thus, the results indicate that, under the conditions evaluated, the different explants of E. oleracea exhibit limited potential for the induction of adventitious organogenesis and somatic embryogenesis, since the concentrations and combinations of plant growth regulators tested do not promote consistent morphogenic responses.

2026-09-25T00:00:00Z NUNES, Hildo Giusepe Garcia Caldas https://repositorio.ufra.edu.br/jspui/handle/riufra/2933 2026-10-13T22:38:38Z 2026-09-18T00:00:00Z

Título: Analise da resposta do feiljão-caupi a distintas laminas de irrigação usando o modelo aquacrop Autor(es): NUNES, Hildo Giusepe Garcia Caldas Abstract: The Northeastern part of Para State has been the main productive pole of cowpea in the state regarding high investments that were applied to reduce current low yield (788 kg ha”), which is due to poor management and partly due to climatic variability. Thereby, several ways have been adopted to increase its production, as an example, the use of models that intend to anticipate the use of different managements, aiding in the decision making and the obtaining of better productions. The crop models are still used in simulation of biomass (B) and yield (Y) under different climatic conditions and applied. water blades. Therefore, this work aimed to calibrate (evaluate) and apply a generic model of culture (AquaCrop) for cowpea in Castanhal, in attempt to define an agricultural calendar and zoning in the state of Para. Thus, this thesis addressed the use of the AquaCrop model in canopy cover (CC), B and Y estimations, as well as its application in the estimation of soil water content (SWC). After validation, the model was used to identify the optimum seeding window (OSW) for Castanhal, and finally an agropedoclimatic zoning of the areas suitable for the cultivation of cowpea in the state, taking into account the diverse characteristics of the region, through the spatialization of the simulated results. The results showed that AquaCrop, after its calibration for the CC, according to the leaf area index (LAI), obtained excellent estimates of B and Y, presenting mean normalized quadratic errors (NRMSE) of less than 20% and 6% for all the treatments adopted and during the calibration and validation stages, respectively. These values of NRMSE obtained demonstrate the efficiency of the model (EF) in the yield simulation of the cowpea, presenting values higher than 0.88, which indicates a very good performance. The model can also help in water management, because when comparing the SWC simulated by the model with the data obtained in the field, its efficiency (EF) was always higher than 0.70, which indicates a good performance in the simulation of this parameter. The municipality of Castanhal has an OSW that runs from April 10 to 20", due to the average yield loss of less than 10%, to a 90% probability for yields exceeding 1300 kg ha’', and to the low rain risk in its harvesting period. These results show that the model can help in the management of irrigation by cowpea cultivation and that can contribute to the development of this crop in the state.

2026-09-18T00:00:00Z