only marginally significantP < 0.10
Indices formulated using green and red bands, GR, NDVIg and OSAVIg showed significant correlation ( P < 0.01) with CCI at anthesis and final grain filling, whereas the correlation between the indices GR and NDVIg with CCI at the initial grain filling stage was only marginally significant (r = 0.56, P < 0.10).