Posted: 02/07/2015 at 14:00
The best test for watering in pots is to stick your finger down into the soil as deeply as you can. While the surface might be dry, there can be moisture deeper down where the roots are.
Another test is simply to watch the plants. If they droop during the day when it's warm, wait till the sun goes down. If they perk up again, they're fine. If not, water.
I'd've thought every other day was a bit much unless you've got pretty warm weather.
I'd also lay off the fertiliser. Let the plants get going under their own steam. A lot of people fertilise after the first couple of trusses appear, which is fair enough, but it's the feeding regime after that that's more important. Certainly toms in pots need more fertiliser than plants in the ground because watering leeches out the nutrients from the confined space of the pot. On the other hand, toms don't need a lot of fertiliser to prosper. They respond better to "tough love". Too much fertiliser - and water, for that matter - only leaves them bloated and less likely to produce fruit.
On the couple of occasions that I've grown toms in pots, I didn't feed more than once a month.