Banca de DEFESA: GABRIELE MEDEIROS HERMÓGENES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE: GABRIELE MEDEIROS HERMÓGENES
DATA: 09/07/2025
HORA: 14:00
LOCAL: Sala de Videoconferência do Departamento de Agricultura da UFLA (DAG-UFLA)
TÍTULO:

 

EFFECTS OF LIMESTONE APPLICATION ON SOIL PHYSICAL, CHEMICAL, AND BIOLOGICAL PROPERTIES AND COFFEE YIELD

PALAVRAS-CHAVES:

Liming, solo fertility and structure, microbial activity, Coffea arabica, tropical soils

PÁGINAS: 90
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Manejo e Tratos Culturais
RESUMO:

Liming is essential for soil acidity in tropical regions, affecting chemical, physical, and biological soil properties with potential impacts on coffee crop productivity. This set of studies evaluated the effects of increasing lime rates (0 to 24 t ha⁻¹), applied either on the surface or incorporated, on fertility, structure, microbial activity, and yield in coffee-cultivated Oxisols under field conditions in Minas Gerais, Brazil. In the first study, multivariate analyses revealed that 3 and 6 t ha⁻¹ significantly improved soil chemical properties such as pH, Ca²⁺, Mg²⁺, soil organic matter, K⁺, and SO₄²⁻, with increased coffee yield observed at 6 t ha⁻¹. The second study identified specific physical responses to liming, including increases in water-dispersed clay and microporosity, although no significant changes in overall soil structure were found. Productivity varied across locations, showing a quadratic response with a maximum estimated yield around 12 t ha⁻¹ in one of the farms. The third study demonstrated that liming enhanced arylsulfatase activity and microbial respiration regardless of the application method, but did not significantly affect microbial biomass carbon or other enzymes. Coffee productivity remained statistically unchanged in the short term. Overall, the results indicate that surface liming can improve key chemical and biological soil properties, with localized effects on physical structure and yield responses that vary depending on site conditions, underscoring the need for site-specific liming strategies in established coffee systems.

MEMBROS DA BANCA:
Interno - CHRISTIANE AUGUSTA DINIZ MELO (Suplente)
Interno - DALYSE TOLEDO CASTANHEIRA (Membro)
Externo à Instituição - DEVÍSON SOUZA PEIXOTO - REHAGRO (Membro)
Externo à Instituição - FÁBIO AURÉLIO DIAS MARTINS - EPAMIG (Suplente)
Externo à Instituição - JOSÉ MARIA ARCANJO ALVES - UFRR (Membro)
Externo ao Programa - LEONIDAS CARRIJO AZEVEDO MELO - DCS/ESAL (Membro)
Presidente - SILVINO GUIMARAES MOREIRA (Membro)