https://repositorio.ifgoiano.edu.br/handle/prefix/2307 Sat, 11 Apr 2026 01:31:11 GMT 2026-04-11T01:31:11Z https://repositorio.ifgoiano.edu.br/handle/prefix/5798 Título: QUALIDADE FÍSICA DO SOLO NA DIAGNOSE DA COMPACTAÇÃO E NA AVALIAÇÃO DA AGRICULTURA REGENERATIVA Autor(es): Rezende, Alexandre Garcia Primeiro Orientador: Severiano, Eduardo da Costa Primeiro Membro da Banca: Costa, Kátia Aparecida de Pinho Segundo Membro da Banca: Ferreira, Camila Jorge Bernabé Terceiro Membro da Banca: Iori, Piero Abstract: Soil compaction is a major form of physical degradation, severely impacting soil functions essential for agricultural productivity and environmental sustainability. In Brazilian tropical soils with contrasting textures, defining reference values for physical attributes is crucial for structural diagnosis and management planning. This study aimed to model soil compaction in a sandy soil (73 g kg⁻¹ clay) and a very clayey soil (823 g kg⁻¹ clay), proposing reference bulk density (Bd) values associated with beneficial or critical structural conditions. Undisturbed soil samples were subjected to uniaxial compression tests, with structural changes quantified through Bd, least limiting water range, porosity, and mechanical pressures (σp, σb, and σl). Results indicated a severe water availability limitation in the sandy soil and high compaction susceptibility in the very clayey soil. The inverse relationship between clay content and Bd reference values allowed for the refinement of pedotransfer functions tailored to specific textural classes. Following this, the study assessed the impact of regenerative agriculture as a sustainable management strategy to mitigate compaction and improve water infiltration and groundwater recharge in the Brazilian Cerrado. Field assessments were carried out in nine plots across eight farms in southwestern Goiás, using a Regenerative Agriculture Index (RAI) based on five core management principles. Undisturbed soil samples were collected at three depths (surface, shallow, and moderately shallow layers) and evaluated for bulk density, porosity, saturated hydraulic conductivity (K₀), air permeability (Kear), and water retention. Soil compaction diagnosis was performed using region-specific pedotransfer functions. The results showed initial improvements in surface layer physical quality under higher regenerative management levels, but subsurface compaction remained a significant constraint. Multivariate analysis identified macroporosity as the key attribute distinguishing structural conditions. The RAI had a modest yet positive influence on soil hydraulic conductivity and relative density. The study concludes that while regenerative agriculture has potential to restore tropical soil physical quality, its effectiveness is correlated with longer adoption periods and comprehensive implementation of its principles, especially crop diversification. Editor: Instituto Federal Goiano Tipo: Tese Thu, 26 Jun 2025 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/5798 2025-06-26T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/4875 Título: SOLUBILIZADORES DE FOSFATOS ASSOCIADOS A FONTES DE FÓSFORO NA CULTURA DO MILHO Autor(es): Pereira, Adriano Vilela Primeiro Orientador: Alves, José Milton Abstract: Phosphorus (P) stands out in intensive agricultural production due to its low mobility in the soil, low pH level, and high potential for chemical and organic immobilization, which forces producers to apply large amounts of phosphate fertilizers to saturate retention points and make this nutrient available for absorption and assimilation by plants. One of the ways to increase the phosphorus availability to plants is by using phosphorus-solubilizing microorganisms. This paper aimed to evaluate the use of phosphorus-solubilizing microorganisms associated with phosphorus sources in corn crops. This experiment was carried out at the Agricultural Research Center (CPA, Brazilian acronym) in Rio Verde Municipality, Goiás State, Brazil. The design was in a 3x4 factorial scheme, totaling 12 treatments with 4 replicates. The collected data were subjected to analysis of variance by the F test at the 5% probability level and the means were compared using the Turkey test, when significant effects among treatments were found. The results showed that the use of phosphorus-solubilizers in corn crop is effective, promoting increased yield. However, the tested fertilizers did not show the same efficiency regarding phosphorus sources, with triple superphosphate being the most effective source for yield gains. Keywords: Bacteria. Phosphate fertilization. Phosphorus availability. Editor: Instituto Federal Goiano Tipo: Dissertação Wed, 28 Aug 2024 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/4875 2024-08-28T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/2373 Título: DESEMPENHO DE NOVILHOS NELORE E POTENCIAL PRODUTIVO DO CAPIM-PIATÃ EM SISTEMAS DE INTEGRAÇÃO LAVOURA-PECUÁRIA-FLORESTA Autor(es): Barbosa, Ruth; Oliveira, Caroline; Santos, Darliane; Karvatte Junior, Nivaldo; Delmondes, Tais; Macedo, Manoel; Almeida, Roberto Editor: Instituto Federal Goiano Tipo: Relatório de Pesquisa Wed, 23 Feb 2022 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/2373 2022-02-23T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/2308 Título: MELHORAR A DISTRIBUIÇÃO TÉRMICA EM SISTEMAS DE PASTEJO FAVORECE ATIVIDADES COMPORTAMENTAIS DE BOVINOS DE CORTE Autor(es): Karvatte Junior, Nivaldo Abstract: This study proposes to elucidate how thermal distribution in grazing systems with different tree densities can influence the behavioural activities of beef cattle in central Brazil. The experiment was laid out in a randomized complete block design with a split-plot arrangement, in four replicates. We evaluated the spatiotemporal thermal distribution within two silvopastoral systems with 89 and 113 trees ha-1 and a system with an unshaded pasture of Brachiaria brizantha cv. BRS Piatã during the summer of 2020. The analysis was based on the black globe temperature (Tbg), infrared thermography (IT), and the main feeding behaviour-related activities and displacement of 80 male Nellore cattle using bioacoustics and a global positioning system. The presence of trees at different densities affected the spatiotemporal thermal distribution, with an average difference of up to 4.7 °C in Tbg between the systems, and that better spatial exploration is possible in those with the presence of shade. The longest time spent grazing occurred between two hours (average of 44.7 min h-1, in the non-shaded system) and three hours (average of 44.5 min h-1, in the silvopastoral systems) after the peak of Tbg (39.2 °C), whereas the other activities (idleness, rumination, water consumption, and mineral consumption) were carried out predominantly at night. Therefore, the better thermal distribution in silvopastoral systems favours the grazing activity of beef cattle on pasture during the daytime period, allowing the animals to select the nocturnal period for rest and rumination. Editor: Instituto Federal Goiano Tipo: Relatório de Pesquisa Mon, 20 Dec 2021 00:00:00 GMT https://repositorio.ifgoiano.edu.br/handle/prefix/2308 2021-12-20T00:00:00Z