2014. The photosynthetic capacity index (Ph.C.=P index) developed by the authors of this paper could be perfectly used to characterise the impact of crop year and growing area, as well as crop density. Pearson’s correlation analysis was used to demonstrate a close correlation between the yield of maize hybrids and the P index (0.829**-0.866**) and a moderate correlation between yield and LAImax (0.440**-0.579**). According to the performed examinations, there was no correlation between yield and SPADmax readings (-0.252–+0.094).
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