To calculate the amount of water lost by a plant to evapotranspiration, you'll need the plant adjustment factor, KL. This is a factor that accounts for the distinctive water-regulating differences of various species.
Obtaining an adjustment factor for a turfgrass is a relatively straightforward matter: you can simply look it up in a table.
To see a summary of the KL values recommended for turfgrasses, refer to Table 1.
Scientists have been able to specify the KL values for various species of turfgrass by applying methods developed for agricultural crops. This strategy works because turf usually is relatively homogeneous, as is the typical agricultural crop, and because a turfgrass conforms relatively well to the assumptions inherent in the definition of a reference ET plant.
You want to estimate the amount of water lost to evapotranspiration in September by your landscape's Bermuda grass, a warm-season turfgrass.
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