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By taking the still active elements into the plant's cells so that the entire harvest cannot be used but has to be burned (which just returns the radioactivity into the soil)?
How come could that be an improvement?

Who says the elements are been taking back to the plant?
This humanity needs to learn about the root systems first , before they wanna start a reasoning...
Educated fools from uneducated schools ;)

Who says they disappear into the blue? :D

Educated fools from uneducated schools ;)

Haha.
I'm sorry that you missed your natural science classes.