CO2 Production in Tropical Hydromorphic Soils Induced by Low Doses of Isopropylamine Salt Application

Isopropylamine Salt of Glyphosate is a widely used herbicide with environmental concerns, especially in sensitive ecosystems like Brazil’s Cerrado veredas. These hydromorphic soils, rich in organic matter and prone to flooding, are critical for water regulation but are increasingly affected by agricultural practices. This study evaluates the electrochemical and microbial responses of flooded veredas soils to varying Isopropylamine Salt of Glyphosate doses under anaerobic conditions. Soils were treated with three doses (low—0.0016 g of ISG L–1, intermediate—0.016 g of ISG L–1, high—0.16 g of ISG L–1) and incubated over 30 days. Electrochemical parameters (pH, redox potential) and biological indicators (CO2 production, microbial biomass) were analyzed. Results revealed dose-dependent effects: low doses buffered acidity and stimulated CO2 production, while high doses accelerated anaerobic conditions, suggesting stress-induced microbial shifts. Redox potential and microbial biomass showed limited sensitivity, indicating the complexity of ISG-soil interactions. These findings highlight the need for tailored ISG management to mitigate impacts on anaerobic tropical soils and protect fragile ecosystems.