Fig. 2. The coefficient of determination (R2) for the linear or quadratic model between growth stage (GS)-30 whole-plant N concentration and the normalized difference vegetation index (NDVI) vs. mean GS-30 biomass.
Fig. 2. The coefficient of determination (R2) for the linear or quadratic model between growth stage (GS)-30 whole-plant N concentration and the normalized difference vegetation index (NDVI) vs. mean GS-30 biomass.