TABLE 4.

Model performance on the training and validation datasets of the complete RF model, simplified RF model, and weather-only RF model.

	Variables input	Training RMSE	Training R2 with SD	Evaluation RMSE	Evaluation R2
Complete RF model	N fertilization Traffic intensity Categorized root zone Weather Days grow NDRE a Soil moisture content	0.339 (0.06)	0.64 (0.08)	0.489	0.47
Simplified RF model	N fertilization Traffic intensity Categorized root zone Weather Days grow	0.367 (0.06)	0.57 (0.09)	0.515	0.42
Weather-only RF model	Weather Days grow	0.406 (0.09)	0.46 (0.20)	0.567	0.30
PACE Turf GP model	Temperature	N/A	0.01	N/A	N/A

^aNDRE, normalized difference red edge.