Banca de DEFESA: ANDRÉ DE BRITO SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRÉ DE BRITO SOUSA
DATE: 05/12/2024
TIME: 14:00
LOCAL: UFAPE- sala de aula PPGPA
TITLE:

ACQUISITION OF ESSENTIAL ELEMENTS THROUGH ENZYMATIC ACTIVITIES IN PASTURE SOILS IN PERNAMBUCO

KEY WORDS:

Soil Quality; Soil Microbiology; Enzymatic Activities; Soil Quality Index; Productive Pastures

PAGES: 48
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Microbiologia e Bioquímica do Solo
SUMMARY:

This study analyzes the acquisition of essential elements in pasture soils in Pernambuco, using enzymatic activities as indicators of soil quality and fertility. Pernambuco, with its strong vocation for livestock farming, faces the challenge of pasture degradation, a problem that compromises agricultural and environmental productivity. Soil degradation reduces the efficiency of essential nutrient cycles and negatively impacts the availability of nutrients such as nitrogen and phosphorus, which are fundamental elements for plant growth and development. In this context, the soil enzymes arylsulfatase, β-glucosidase, and acid phosphatase play a crucial role in nutrient cycling and maintaining soil health, as they are sensitive to environmental changes and soil management practices. The study was conducted in 24 pasture areas distributed across four mesoregions of the state: Agreste, Zona da Mata, Vale do Pajeú, and Sertão do São Francisco. Soil samples were collected and subjected to chemical, genetic, and enzymatic analyses to understand microbial dynamics and soil responses to different management conditions. It was observed that areas with better conservation practices showed higher levels of total organic carbon (TOC), base saturation (V%), and nitrogen, along with increased activities of arylsulfatase, β-glucosidase, and urease enzymes, indicating better soil structure for nutrient cycling. In contrast, in degraded areas, acid phosphatase was the predominant enzyme, suggesting an adaptation of microbial communities to low phosphorus levels. Statistical analysis confirmed that well-conserved soils promote a more diverse and interconnected bacterial community, reinforcing the resilience and sustainability of these environments. These results demonstrate that management practices promoting soil conservation are essential for maintaining pasture productivity and environmental sustainability. The study contributes to understanding ecological processes and microbial adaptation strategies, highlighting the importance of sustainable pasture soil management for maintaining fertility and environmental quality in Pernambuco.

COMMITTEE MEMBERS:
Interna - ERIKA VALENTE DE MEDEIROS
Externo à Instituição - CARLOS ALBERTO FRAGOSO DE SOUZA - UFPE
Externa à Instituição - RAFAELA FELIX DA FRANÇA - UFRRJ