Anyone tried simple Electro-magnetic experiments on plants?

I don't know where to put this; I am only putting it here because I got the idea from an old Rodale book.

Supposedly, there are lots of simple, non electrical ways to put electromagnetic forces to work growing plants for you. I am NOT interested in 'zapping' my plants with an electrical current, or anything like that.

What I am thinking of are things ranging from stone structures, to loops of copper wire around plants stems, to various biodynamic techniques.

Has anyone here tried these things? Especially, has anyone tried them with controls? Pictures of set ups, results, etc would be great.

Also, supposedly there are really ancient methods for doing this. Does anybody have any information, opinions, etc. on this?

How is the book called? It is maybe an anthropsophic way of thinking.

No, just an old copy of the Organic gardening encyclopedia. The information is not included in the later editions. (And there never was that much; just a little paragraph.)

I once read a web page (unfortunately, I can't remember where...that bookmark must be buried deep, or lost) where they discussed magnetic effects. They had done experiments exposing some seeds to one end of a magnet, and the other half to the other end. I forget which was which, but their conclusion was those exposed to one end had a higher germination rate, while those exposed to the other end produced stronger, more productive plants.

It does indicate that polarity has an effect on both germination, and production, though helping one harms the other.
To me, this sounds like it would be worth investigating further. Perhaps some short season annuals would be a good starting point, expanding later to perennials. If there is validity to the experiments, that would be another tool to add to the tool box.

Makes me curious if different species react the same, or possibly, the opposite?

I will definitely be trying some experiments this spring. I think the "loop of coper wire experiment" would be easiest. It would be really great if some simple method like this could increase production in a meaningful way. Supposedly a loop of copper wire around the stem will also suppress some plant diseases, perhaps by boasting the overall health of the plant. Since the copper is not supposed to touch the plant, I don't think it could have a direct fungicide effect.

Storl writes of this sort of thing too and he has an antroprosophic background, but that does not mean that the anthros have invented it.
Der Kosmos im Garten, but he has written an English organic gardening book too, I haven't got it so I don't know weather he writes about these things there.

In the 50s and 60s, electro-shock therapy was used to produce vegetables.