Fig. 4. Cumulative CO₂ emissions in all soils at 60% water-filled pore space (WFPS) and four levels of soil electrical conductivity (EC). Vertical bars show standard errors. Values in parenthesis represent the final soil EC (dS m^–1) measured after a 10-d incubation at 25°C. Letters at the end of each line indicate significance of differences by LSD test at = 0.05.