Fig. 3. The normalized difference vegetation index (NDVI) vs. growth stage (GS)-30 whole-plant N concentration for the four site–years with high (>1000 kg ha-1) mean GS-30 biomass.
Fig. 3. The normalized difference vegetation index (NDVI) vs. growth stage (GS)-30 whole-plant N concentration for the four site–years with high (>1000 kg ha-1) mean GS-30 biomass.