R. Han wrote:
So if someone wanted to prove to me that just by using sufficent compost you can circumvent the clubroot problem,
he would need to inoculate the soil with clubroot and keep growing.
Now my question is, has anyone ever done such an expermient?
My focus/issues with crop rotation centers around brassicas because they seem to be the staple annual vegetable in the temperate climate
especially during the colder season (Don't forget Turnips are brassicas , they used to fill the niche potatoes took over) and most of the profitable market gardet crops are brassicas too (Asia salad, arugula, radishes just to name a few).
So you're asking if anyone has ever used permaculture methods and/or non-rotation methods with soil known to have clubroot to successfully grow brassicas unaffected by it, or are you literally asking if anyone has intentionally added
Plasmodiophora brassicae to their soil and successfully grown brassicas unaffected by it? If you're looking for the latter, I'd think that'd be something an agricultural college student would do or someone with a research grant... and I haven't seen any papers about it, so I'm thinking it hasn't been done, but clubroot hasn't been a focus for me. Perhaps doing a search via your local university's resources and librarian could help. Now, for the former, there may be people who have been able to overcome already existing clubroot without the standard methods of removal, sterilization, not growing brassicas, etc for the area...but again, I have not heard of them. You might want to start a thread specifically about clubroot (in the title too) to find out if any are here.
Personally, I'm in the group of people who grow too many things together that it makes conventional crop rotations complicated to say the least, and practically impossible realistically, especially when it comes to brassicas. I love brassicas, so they're all over the place and I will stick them under or beside almost anything and everything. Also, I let my things go to seed for collecting and self-resewing, so they place themselves all over the place too. I would be hard-pressed to find a garden spot where a brassica hasn't been for more than a season or two. That said, while gardening where I am has a multitude of challenges, the large temperature shifts, low humidity, low rain, alkaline high pH soil (and water) actually helps prevent clubroot.
I'm thinking if one were going to try to grow brassica in a place with
Plasmodiophora brassicae in their soil without the standard treatments, it would include doing things to increase alkalinity and pH, make sure you support the health of the soil microbially, try to avoid soil temperatures between 68-77°F, err on the side of less water rather than more (so let the soil dry out some at times), make sure you've got really good drainage, and avoid getting any plant or soil matter from other known or suspected sources of
Plasmodiophora brassicae.