Just some related context I guess.
Hemp/cana and various other plants are used in radio active areas. A bit like mushrooms, they can act like toxic waste recyclers. That's all well and good, but would you smoke or eat plants grown in Chernobyl?. I personally wouldn't, even if they said it was safe.
After Nagasaki and Hiroshima many people died to radiation poisoning and on a generational basis, children had birth defects also. There's an island that the American government dropped bombs near to test the results of radiation on the tribe there (Hitler is
seriously over rated as humanity's go to definition of evil) while leading them to believe they were perfectly safe. A large portion of those people got the same forms of cancer and children where being born with mutations, some extremely horrifying (don't look it up, just trust me). This was all due to the heavy radioactive metals leaching into the life cycle via water, plants, etc.
The American government alone tested around 1200 nuclear bombs, that we know of. Many under water, many in the upper atmosphere. The Russians are said to have tested around half that but again, it's a huge and secretive country.. so only as far as we know. None the less I feel safe to say a minimum of 3000 nuclear bombs from various nations have been exploded on or above our planet, and not a very long time ago either.
Our planet is mostly a closed loop when it comes to things within the atmosphere, large volcanic eruptions send ash clouds thousands of miles down wind to other countries, rather than into space.
The above pic is our planet in a nut shell. The 3000+ nuclear bombs worth of radiation and heavy metals didn't just disappear, nor did the radiation from various reactor meltdowns, all of it was dissipated all over the planet via the upper atmosphere/jet stream. Add this to the toxicity of plastics, pollution and other man made materials leaching into the water/soil system and I don't think we truly are aware that at some point we are all very likely to get the news ''you have cancer''. It's rally no joke, those nukes set off in the atmosphere continue to fuck the entire eco system, yet it is highly dismissed since the American government (the worlds leading power) are mostly to blame for it.
I guess the point I am trying to make is cana appears to be able to uptake a lot of toxic stuff. I would not want to feed it anything that has links to cancer. However, organic soils and supplements are FAR from automatically safe. It's not like such products shipped from all over the world/oceans come with ''radiation'' or ''heavy metal'' warning levels, who would buy. They are barely even testing that kind of thing for the most part, at least in my limited research of it. So, for context, if you want to remove PGR intake, and you should, go for it. Just be aware that switching to organics isn't guaranteed to be safe either, research the sources of your organics and find ways to test for the heavy metals. If you can't do that then stick with basic raw elemental based dry salt feeds. A lot of the unknowns are removed that way.
It's a horribly sad situation were hydroponic based raw elemental feeds are one of the few ways we can grow clean MJ and even food produce.