Which fuel is likely to reach its moisture of extinction first during nighttime humidity recovery?

Cured cheatgrass is the fuel type that will likely reach its moisture of extinction first during nighttime humidity recovery due to its physical and chemical characteristics. This grass is generally fine, light, and has a low moisture content when cured. As humidity increases at night, moisture can quickly penetrate and saturate cured cheatgrass because it has a lower moisture-holding capacity compared to woody fuels like ponderosa pine or live oak.

Additionally, dry leaves, while also susceptible to moisture changes, have a different structure and may not reach their moisture of extinction as rapidly as cured cheatgrass. The key factor is that cured cheatgrass, being a fine fuel, responds quickly to changes in humidity, making it more likely to extinguish first with increasing humidity levels.

Overall, cured cheatgrass's characteristics as a fine, cured fuel contribute to its quicker moisture absorption and subsequent extinction during nighttime recovery periods.