During the early (6–10 leaves) period of edible carrot growth (I measurement),
when plant assimilation area increased, plant net photosynthesis productivity increased
also (4). When the measurements were carries out at the end of intensive leaf growth
(II measurement), there weren’t dependency, and at the end of intensive root-crop
growth (III measurement), i. e., before yield gathering, photosynthesis productivity
even decreased, because when plants get older and leaves wilt, leaf assimilation area
decreased also (5):