Plant photosynthesis potential in the early period of plant growth (from sowing up
till 6–10th leaf) and during intensive leaf growth directly and strongly depended on leaf
assimilation area (correspondingly r = 0.99; r = 0.96). In the last period, i. e., during
intensive leaf growth, dependency was averagely strong (r = 0.60). Plant assimilation
area influenced crop photosynthesis potential both in the early (I measurement, r = 0.88)
period and during the intensive root-crop growth (III measurement r = 0.90), but didn’t
have influence in the period of intensive leaf growth (II measurement) (Fig. 3).