http://repositorio.ufc.br/handle/riufc/74 Sat, 04 Apr 2026 19:27:26 GMT 2026-04-04T19:27:26Z http://repositorio.ufc.br/handle/riufc/85640 Título: Efeito de diferentes laminas de irrigação sobre a produtividade da soja (Glycine max (L) Merril) utilizando o sistema de aspersão em linha Autor(es): Rodrigues, Antônio Luciano Abstract: A field work was done at the "Fazenda Experiemental da Universidade Federal do Ceará", at Pentecoste, Ceará, Brazil, from October 1988 to february 1989, to evaluate the effects of different irrigation levels on the productivity of tropical saybeans (Blicine max (L) Merril), using a line source sprinkler system. [...] Tipo: Dissertação Mon, 01 Jan 1990 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85640 1990-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85638 Título: Aprendizado profundo (Deep learning) na identificação de estresse hídrico em meloeiro Autor(es): Mariano, Arthur Breno Rocha Abstract: Remote monitoring through imaging is a powerful tool for evaluating the performance of melon crops, which exhibit high water demand and are primarily grown under irrigation. This study aimed to analyze the physiological and yield behavior of melon plants under different irrigation depths, as well as to build a database of spectrum visible and thermal images for water status prediction via deep learning. The experiment followed a randomized complete block design with four irrigation depths (50%, 75%, 100%, and 125% of crop evapotranspiration - ETc) and five replications. Drip irrigation was employed, and the Class A pan method was used to determine evapotranspiration. The length of the main branch showed a linear relationship with the increase in the applied irrigation depth. Physiological results at 65 days after transplanting (DAT) showed that transpiration and stomatal conductance exhibited quadratic behavior, with maximum values near 100% of ETc, while the photosynthetic rate and fruit mass increased linearly with the irrigation depth. Conversely, total soluble solids and pH decreased with increasing water depth. The thermal index showed a negative linear relationship with the applied depth. Regarding the computational aspect, InceptionV3, MobileNetV3, and ResNet50V2 networks were evaluated. It was found that visble spectrum images outperformed the thermal index by 9% in accuracy, and that segmentation reduced network performance by 6%. Although global metrics were similar across architectures, InceptionV3 was the most efficient, achieving the best results in only 19 minutes, compared to 104 minutes for ResNet50V2, as well, the worst coefficients of determination for the applied water depth in relation to the thermal index were observed in the morning period. Tipo: Dissertação Wed, 01 Jan 2025 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85638 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85396 Título: Sustentabilidade técnico-econômica de cultivos irrigados no projeto de irrigação Curu Pentecoste, CE Autor(es): Moreira, Hellen Karine Gomes Abstract: The study was conducted in the Curu Pentecoste Irrigation Project (PICP), located in the state of Ceará, Brazil, with the overall objective of assessing the sustainability of the main irrigated crops developed in the area from both technical and economic perspectives. The specific objectives were to analyze the Relative Irrigation Supply (RIS) indicator; evaluate the performance of irrigation systems; assess the quality of shallow well water for irrigation purposes; and analyze socioeconomic indicators associated with the main irrigated crops. For the calculation of RIS, monthly data were collected on the volume of water supplied through flow meters installed at the headworks of the areas, as well as on crop water demand. The evaluation of irrigation systems was carried out based on the Christiansen Uniformity Coefficient (CUC), the Statistical Uniformity Coefficient (SUC), and the Distribution Uniformity Coefficient (DUC). The technical and economic analysis was based on annual production data from irrigating farmers, considering fixed and variable costs, which enabled the calculation of Added Value (AV), Farmers’ Income (FI), and the Social Reproduction Level (SRL). The RIS indicated an excess of applied water in all analyzed areas, directly related to the irrigation practices adopted by farmers, exacerbated by the lack of technical assistance and by the ongoing transition from furrow irrigation systems to localized irrigation systems, specifically micro-sprinkler irrigation. The irrigation systems showed satisfactory technical performance in terms of uniformity; however, operational problems were identified. Irrigation water productivity was higher when production was intended for the commercialization of coconut water through contractual arrangements. Irrigation water quality indicated suitable conditions for agricultural use, with no restrictions related to soil salinity or sodicity risks. Socioeconomic indicators demonstrated that scenarios with financing exhibited superior performance compared to scenarios without financing. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85396 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/84941 Título: Estudo de parâmetros para avaliação de irrigação por sulcos abertos em declive utilizando um modelo algébrico Autor(es): Pordeus, Roberto Vieira Abstract: This work deals with an application of LEVIEN's (1985) farrow irrigation model. Some aspects were analized: the relationship betweer shape factors and advance curve; the influence of recession on ultimate infiltrated profile; and application of a parabolic equation to calculate, the wetted perimeter and to verity its influence on farrow irrigation. [...] Tipo: Dissertação Mon, 01 Jan 1990 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/84941 1990-01-01T00:00:00Z