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Table 7 Fitted equations for the normalized redness intensity (NRI), normalized greenness intensity (NGI), and normalized blueness intensity (NBI) values (x) and yield (y) across different growth stages of rice

From: Evaluation of grain yield based on digital images of rice canopy

Stages NRI NGI NBI
Regression equations R 2 p Regression equations R 2 p Regression equations R 2 p
TS y = − 2E + 06x2 + 1E + 06x − 188418 0.0109 0.9311 y = − 119334x2 + 96588x − 12308 0.0597 0.67032 y = 245939x2 − 80957x + 12745 0.0664 0.63984
PS y = − 9E + 06x2 + 5E + 06x − 783277 0.2824 0.11566 y = 2E + 07x2 − 2E + 07x + 4E + 06 0.3632 0.05322 y = − 8E + 06x2 + 4E + 06x − 403687 0.3531 0.05894
HS y = − 8E + 06x2 + 6E + 06x − 976732 0.1738 0.28902 y = 7E + 06x2 − 7E + 06x + 2E + 06 0.226 0.18915 y = − 4E + 06x2 + 1E + 06x − 73035 0.1926 0.24896
FS y = − 9E + 06x2 + 6E + 06x − 1E + 06 0.4148 0.03074 y = − 250780x2 + 158991x − 10957 0.1883 0.46575 y = − 2E + 06x2 + 755848x − 51130 0.293 0.10504
LFS y = − 3E + 06x2 + 2E + 06x − 434790 0.4853 0.01333 y = − 158882x2 + 99109x − 5580.9 0.2439 0.10197 y = − 1E + 06x2 + 436500x − 32612 0.4122 0.03163
  1. TS, JS, HS, FS, LFS and MS indicate the tillering, jointing, heading, filling, late filling and maturity stages of rice, respectively