https://repositorio.uema.br/jspui/handle/123456789/1879 Tue, 01 Sep 2026 21:06:57 GMT 2026-09-01T21:06:57Z http://repositorio.uema.br:80/retrieve/2c613a06-df8a-4e3d-9125-fc561c213486/Captura de tela 2024-01-29 173536.png https://repositorio.uema.br/jspui/handle/123456789/1879 https://repositorio.uema.br/jspui/handle/123456789/6562 Título: Qualidade fisiológica de sementes de algodoeiro submetidas a tratamento com bioinsumo a base de Bacillus aryabhattai e arbolina. Abstact: The cotton plant crop presents high sensitivity to water deficit, which compromises its development and productivity. In this context, the present study had as objective to evaluate the effects of the cotton seed treatment with Bacillus aryabhattai and Arbolina on germination, emergence, rooting, development and productivity of the crop submitted to water stress. The experiment was conducted on a laboratory and a greenhouse, utilizing BRS 700 B3RF cultivar seeds. The experimental design adopted was completely randomized in a 2 × 4 × 2 factorial scheme, considering the presence or absence of Bacillus aryabhattai (Auras️) inoculation, four doses of Arbolina (0, 2, 4 e 8 mL kg⁻¹ of seed) and two water regimes (irrigated and deficit). The analyzed variables included germination and emergence rates, emergence The cotton plant crop presents high sensitivity to water deficit, which compromises its speed index, shoot and root systems dry mass, as well as the plant development under water stress conditions. The laboratory results indicated a significant effect of Auras (Bacillus aryabhattai) and Arbolina treatments on germination and root development, with the 4 ml kg⁻¹ Auras dose showing the highest germination percentage. The interaction between the factors significantly influenced the seedling emergence and the germination speed index. Complementary studies will be conducted to evaluate the impacts on the final crop productivity. Wed, 01 Jan 2025 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/6562 2025-01-01T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/6561 Título: O uso de drone na avaliação da distribuição longitudinal de plantas de milho (zea mays l) semeadas com uma semeadora tração humana Abstact: Precision agriculture has expanded with the use of technologies such as drones, enabling efficient crop monitoring. This study aimed to evaluate the performance of a human-powered seeder in the longitudinal distribution of maize (Zea mays L.) seeds using aerial images captured by a drone. The experiment was conducted under no-tillage conditions in Bom Lugar – Maranhão, Brazil. DJI Mini 3 drone flights were carried out at different phenological stages of the crop, generating orthomosaics and Digital Elevation Models (DEM) using Agisoft Metashape software. Planting failures were estimated through supervised classification in the SPRING software, allowing the identification of plantability gaps, stand uniformity issues, and operational deficiencies in the seeder. The results demonstrated that drone technology is effective for diagnostics and agronomic decision-making in small-scale farming systems, contributing to resource optimization and increased productivity. Wed, 01 Jan 2025 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/6561 2025-01-01T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/6560 Título: Efeitos subletais do óleo fixo de algodão (Gossypium hirsutum. L) ao ácaro predador Amblyseius largoensis muma (Acari: Phytoseiidae) Abstact: In addition to the use of predators in the biological control of R. indica, botanical products such as fixed oils have been tested in the laboratory. In this context, the objective of this study was to determine the ovicidal effect of 50% and 80% lethal concentrations (LCs) of fixed cottonseed oil on R. indica and the predatory mite Amblyseius largoensis Hirst (Acari: Phytoseiidae), as well as the sublethal effects of LC80 on the functional and numerical response and instantaneous growth rate of the predatory mite. To evaluate the effects of fixed cottonseed oil on Raoiella indica and Amblyseius largoensis, bioassays were conducted using the previously determined lethal concentrations LC₅₀ and LC₈₀. The ovicidal effect was tested by spraying the oil on R. indica and A. largoensis eggs, with egg hatching evaluated β4 and 144 hours after application, respectively. To analyze the functional and numerical response of A. largoensis, females after β4 hours of fasting were subjected to different densities of R. indica eggs and immatures, evaluating predation within β4 hours and oviposition at β4 and 48 hours. Regarding the predator's population growth rate, arenas containing four females and one male fed ad libitum with all stages of R. indica, also sprayed with CL₈₀, were evaluated for seven days. A. largoensis fed with exposed and unexposed eggs, as well as with immatures not exposed to CL₈₀, showed a type II functional response; however, when feeding on immatures exposed to CL₈₀, the functional response was altered to type III. Furthermore, exposure to oil significantly reduced predator oviposition and egg viability, when compared to the other results with oviposition at the highest density offered under the effect of oil. Furthermore, it negatively impacted its population growth rate compared to the control treatment. Fixed cottonseed oil caused sublethal effects on A. largoensis, reducing its reproduction and development. However, the predator demonstrated behavioral plasticity, shifting its functional response from type II to type III when feeding on sprayed immatures. This indicates potential use in controlling R. indica, especially in the egg stage Fri, 11 Jul 2025 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/6560 2025-07-11T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/6559 Título: Potencial dos biossólidos como substratos na produção de mudas do açaizeiro BRS Pai d'Égua (Euterpe oleracea Mart.) Abstact: This study evaluated the effectiveness of using biosolids as a substrate in seedling production of the açaí cultivar BRS Pai d'Égua (Euterpe oleracea Mart.), focusing on its effects on growth. The experiment was conducted in a randomized complete block design (RBD) with 17 treatments and four replicates, totaling 68 experimental units. Treatments consisted of different proportions of biosolids, alone or in combination with cattle manure, soil, commercial substrate, and soil-manure mixture, as well as controls without biosolids. Statistical analysis was performed using the Scott–Knott test at 5% probability, using R software. Treatments T11 (50% biosolids + 50% commercial substrate) and T14 (75% biosolids + 25% soil + manure) provided the highest values of height, stem diameter, height/diameter (H/D) ratio, SPAD index, and leaf pigment concentration. It is concluded that the use of biosolids, alone or in mixtures, represents a viable and environmentally sustainable technical alternative for the production of açaí seedlings. Sat, 04 Jul 2026 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/6559 2026-07-04T00:00:00Z