Table 8.

Path analysis for the effects of wavelengths (550, 660, 735, and 790 nm) and vegetation indices (NDVI, SAVI, GNDVI, NDRE, SCCCI, EVI, and MSAVI) on grain yield (YIE), evaluated in 10 soybean genotypes in the 2018/2019 and 2019/2020 crop seasons

Effect	550	660	735	790	NDVI	SAVI	GNDVI	NDRE	SCCCI	EVI	MSAVI
Direct over YIE	− 0.27	− 0.16	0.18	0.09	0.34	0.04	− 0.15	− 0.40	0.00	0.07	0.17
Indirect via 550	–	− 0.12	− 0.19	− 0.12	− 0.16	− 0.09	0.15	0.13	0.16	− 0.14	− 0.08
Indirect via 660	− 0.07	–	0.04	0.07	− 0.01	0.10	0.14	0.11	0.06	0.07	0.10
Indirect via 735	0.13	− 0.04	–	0.17	0.13	0.16	0.03	0.01	− 0.04	0.17	0.15
Indirect via 790	0.04	− 0.04	0.08	–	0.06	0.09	0.04	0.04	0.01	0.09	0.08
Indirect via NDVI	0.21	0.02	0.25	0.25	–	0.22	0.02	0.08	0.05	0.25	0.22
Indirect via SAVI	0.01	− 0.02	0.04	0.04	0.02	–	0.02	0.02	0.01	0.04	0.04
Indirect via GNDVI	0.08	0.14	− 0.02	− 0.07	− 0.01	− 0.09	–	− 0.14	− 0.11	− 0.06	− 0.09
Indirect via NDRE	0.20	0.27	− 0.03	− 0.18	− 0.09	− 0.21	− 0.36	–	− 0.36	− 0.14	− 0.22
Indirect via SCCCI	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	–	0.00	0.00
Indirect via EVI	0.04	− 0.03	0.07	0.07	0.05	0.07	0.03	0.02	0.01	–	0.07
Indirect via MSAVI	0.05	− 0.11	0.14	0.16	0.11	0.17	0.10	0.09	0.04	0.16	–
Total (r)	0.41	− 0.09	0.55	0.48	0.46	0.44	0.01	− 0.05	− 0.18	0.50	0.44

Coefficient of determination = 0.81

Effect of the residual variable = 0.33