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Table 3 Coefficients of correlation between grain yield (GY) and (1) NDVI extracted from multispectral images taken with the UAV-platform (NDVI-UAP) and (2) leaf senescence index

From: Unmanned aerial platform-based multi-spectral imaging for field phenotyping of maize

  NDVI-UAP Crop senescence index
All N application rates 0.63*** −0.74***
0 and 10 kg ha−1 AN 0.72*** −0.74***
80 and 160 kg ha−1 AN NS −0.44**
  1. NS: P > 0.05, * P ≤ 0.05, ** P ≤ 0.01, *** P ≤ 0.001.