TABLE 2.

Variables used in the random forest (RF) models.

RF variables	Variables names
Biweekly N rate	N rate (kg/ha/2wk)
Daily NDRE	NDRE
Three-day average soil moisture content	Moist avg (3 days)
Weekly walking traffic	Traffic (round/week)
Accumulative days turf grows	Days grow
Research green soil	Rootzone
Maximum, minimum, and average temperature/relative humidity on the clipping collection day	Tmax; RHmax Tmin; RHmin Tavg; RHmin
Maximum, minimum, and average temperature/relative humidity of x (1,2,3,4,5,6) days before the clipping collection day	Tmax (pre x days) Tmin (pre x days) Tavg (pre x days) RHmax (pre x days) RHmin (pre x days) RHavg (pre x days)
Accumulative maximum, minimum, and average temperature/relative humidity of x (2,3,4,5,6,7) days	Tmax (x days accu) Tmin (x days accu) Tavg (x days accu) RHmax (x days accu) RHmin (x days accu) RHavg (x days accu)
Accumulative precipitation/evapotranspiration of x (2,3,4,5,6,7) days	Precip (x days accu) ET (x days accu)
Accumulative difference between precipitation and evapotranspiration of x (2.3.4.5.6.7) days	Precip-ET (x days accu)
Average wind speed of x (1,2,3,4,5,6) days before the clipping collection day	Wind avg (pre x day)