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Table 5 Selected coefficients of correlation between crop traits measured in the field and remote detected canopy cover and NDVI Plant shown for different times of measurement

From: Remote, aerial phenotyping of maize traits with a mobile multi-sensor approach

Ground plant parameter Canopy cover
  DAS a 56 75 81 96 103 113 117 147
Plant density 29 0.67*** 0.78*** 0.73***      
Plant vigour rating 47 0.77*** 0.58*** 0.48***      
Leaf length 49 0.67*** 0.51*** 0.34**      
Radiation interception 75 0.77*** 0.74*** 0.76***      
Radiation interception 97    0.82*** 0.75*** 0.86***    
Total plant biomass 81-97    0.34* 0.22 ns 0.3*    
LAIb 81-97    0.32* 0.3* 0.38**    
Radiation interception 112      0.6*** 0.63*** 0.71***  
Stay green rating 117      −0.22 ns −0.2 ns −0.16 ns  
Stay green rating 147       −0.33** −0.12 ns 0.34**
Radiation interception 147       0.2 ns 0.49*** 0.41**
   NDVI Plant       
Plant density 29 0.37*** 0.52*** 0.39***      
Plant vigour rating 47 0.64*** 0.55*** 0.34***      
Radiation interception 75 0.47*** 0.62*** 0.40***      
SPAD 96    −0.45*** −0.59*** −0.55***    
Radiation interception 97    0.49*** 0.29* 0.50***    
Leaf biomass 81-97    0.39*** 0.43*** 0.35***    
Plant height 81-97    0.41*** 0.18 ns 0.37**    
LAI 81-97    0.58*** 0.44*** 0.58***    
SPAD 103      −0.54*** −0.50*** −0.50***  
Radiation interception 112      0.43*** 0.27*** 0.38***  
Stay green rating 147       0.38** 0.36*** 0.53***
  1. aDays after sowing, see Table 2 for conversion in thermal time, bLeaf area index (m2 m−2).
  2. Significance codes are: ‘***’ p-value < 0.001, ‘**’ p-value < 0.01 and ‘*’p-value < 0.05.