For length
determination of the roots grown along the root windows in rhizoboxes,
root sketches were drawn on transparent plastic foil, before
and after the exposure to low RZT. After digitalization with a flatbed
scanner, the root analysis software WinRhizo (WinRHIZO, Pro V.
2009, Regent Instrument Canada Inc.) was used to determine the
total root length, root diameter of the root samples washed out
from soil and root growth along the root observation windows