I'd really like to know if they did a control where they heated the soil around the roots with the same amount of power using a heating mat or something. My bet

I'd really like to know if they did a control where they heated the soil around the roots with the same amount of power using a heating mat or something. My bet is that it's the heating that is inducing the changes. I wondered about electrode material too. But both questions remain unanswered because sci-hub hasn't added new articles since the 2020 attack in on them in Indian courts. I have no way to access the full text to make an informed comment. The only detail in the snippets and abstract was that it was 50mA of current. That'd be about a watt of heating for typical hundreds of ohms volume resistances of damp soil.