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Table 2 Statistical results of the relationships across the whole set of plots (288), as well as across the set of plots of each trial (72) between grain yield and the ear counting using the algorithm (ears/m2) in the first, second and third date of measurement as well as the manual in situ counting

From: Wheat ear counting in-field conditions: high throughput and low-cost approach using RGB images

Determination coefficient (R2), Pearson correlation (r) and mean (μ) ± standard deviation for NDVI First measurement Second measurement Third measurement Manual in situ counting
Whole dataset (288) R2 = 0.30*** R2 = 0.08*** R2 = 0.05*** R2 = 0.24***
r = 0.55*** r = 0.28*** r = 0.21*** r = 0.49***
Aranjuez Irrigated
Dataset (72)
R2 = 0.05ns R2 = 0.05ns R2 = 0.02ns R2 = 0.18**
r = 0.22ns r = -0.04ns r = 0.14ns r = 0.43**
μ = 0.78 ± 0.03 μ = 0.71 ± 0.07 μ = 0.29 ± 0.14  
Aranjuez Rainfed
Dataset (72)
R2 = 0.05ns R2 = 0.02ns R2 = 0.02ns R2 = 0.53***
r = 0.22ns r = 0.16ns r = 0.14ns r = 0.73***
μ = 0.76 ± 0.02 μ = 0.67 ± 0.04 μ = 0.17 ± 0.11  
Valladolid Irrigated
Dataset (72)
R2 = 0.06* R2 = 0.0049ns R2 = 0.06* R2 = 0.01ns
r  =  − 0.24* r = − 0.07ns r = 0.25* r = 0.07ns
μ = 0.73 ± 0.03 μ = 0.67 ± 0.05 μ = 0.45 ± 0.10  
Valladolid Rainfed
Dataset (72)
R2 = 0.07* R2 = 0.05ns R2 = 0.18*** R2 = 0.05*
r = 0.26* r = 0.22ns r = 0.43*** r = 0.23*
μ = 0.66 ± 0.04 μ = 0.41 ± 0.05 μ = 0.18 ± 0.14  
  1. The mean (μ) ± standard deviation of the normalized difference vegetation index (NDVI) values, across the whole set of plots within each trial is also included for reference
  2. ns no significant
  3. *p value < 0.05; **p value < 0.01; ***p value < 0.001