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To this end, we used a mix of active and passive portable normalized difference vegetation index (NDVI) sensors, RGB indices derived from ordinary cameras, an optical chlorophyll and flavonol sensor (Dualex), and common plant traits that are sensitive to winter tension, i.e. height, certain leaf location (SLA). Our results suggest that NDVI is a good predictor for plant stress, because it correlates really with level (roentgen = 0.70, p le