The type of soil that will allow the roots to be easily evaluated.
We use "Profile - porous ceramic" Type: "Greens Grade"
This give good root development and does not adhere to the roots, allowing them to be cleaned easily after excavation. If you are doing in vivo evaluations, I have little to suggest since I find all transparent media to be questionable for root structure development. There is one other, however, that uses clear beads with a method to provide easy visualization/photographing as well as relatively clean roots after extraction. They claim total transparency, but I have not tested the system.
Dr Zobel
Thanks for your answer, but can I ask for a picture for this method ??
A picture would look like a pot with soil and a plant. As for the transparent bead method, you will have to search for it, I have misplaced my copy.
Sorry
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