with and without remotely sensed data. Inputs from remotely sensed data to the model adjusts the planting date and temporal dynamics of LAI that is consistent with the actual crop growth conditions. These are the major advantages in using satellite imagery which may compensate for simulation errors associated with planting date, temporal changes in LAI, time of LAI decline after its peak, and rate of senescence. The assumptions in these assessments are that all spring wheat varieties cultivated in North Dakota have the same average response to environmental conditions and the same length of growing season.