Nutritional Dynamics Characterization of Soil Under Pasture in A Land Reform Settlement Area in Southeastern Pará

Objective: The objective of this study is to diagnose the nutritional properties of the soil in pasture agroecosystems, monitoring changes over three years in the São Francisco Settlement Project, Southeastern Pará. Theoretical Framework: This research is based on the implications of deforestation and the conversion of forests into pastures for soil quality, highlighting inadequate management practices and their impacts on the physical, chemical, and biological attributes of the soil. Method: A three-year monitoring study was conducted on Brachiaria brizantha pastures with over 30 years of use without proper management. Soil samples were collected at a depth of 0-20 cm and analyzed for chemical attributes. A randomized design, geoprocessing for area mapping, and statistical analysis using ANOVA were employed. Results and Discussion: The results indicated low soil fertility, high acidification (low pH), and variation in organic matter (OM) and aluminum (Al³⁺) levels. Despite some improvements in OM levels over the period, continuous degradation was observed, driven by the lack of soil correction and sustainable management practices. Deforestation linked to agricultural expansion was identified as a critical factor. Research Implications: The findings highlight the need for sustainable pasture management strategies to minimize environmental impacts and improve soil quality in rural settlements. Originality/Value: The study provides data on soil attribute monitoring in Amazonian pasture agroecosystems, emphasizing the importance of sustainable agricultural practices in rural settlements.