Fig. 7
From: A spatio temporal spectral framework for plant stress phenotyping
Means and standard deviations of SPAD measurement values obtained over three replications of each of the three different Nitrogen treatment regimens. One can see that the plant N availability which correlates strongly with the SPAD values is lower in the deficient (Low N input) case, however, similar for the medium and high N input levels. This indicates that the plants’ Nitrogen requirement in these two cases is satisfied, hence there is little need for the additional fertilizer present in the high N treatment