I have grown tomatoes using ring culture in my greenhouse for a very long time, using fresh compost every year, but just a mixture of compost and soil in the ground.

Two years ago the crop was very poor and there were serious problems with wilt, I think the official term is 'verticillium wilt'  I suppose having the roots in soil for many years isn't a good thing. I know, the official ring culture advice is to use pea gravel at the bottom, but I never did.

last year I got some large 12" pots (actually chip shop mayonnaise buckets) drilled plenty of holes and grew my tomatoes in these.

Again, for the 2nd year running, not too good .. blossom end rot on many tomatoes, which I think is caused by over-watering.

Now I am thinking .. I should get a moisture meter, then just water when required.

There's this one for under a fiver .. https://www.wilko.com/en-uk/wilko-soil-moisture-ph-tester/p/0261281

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Any advice would be appreciated.