I agree with inconsistent watering: if the tomato plant is a little dry and then you water it, the fruit take up water faster than their skins can expand, so they split. There is also a genetic component to this; some varieties are simply more prone to cracking and splitting than others.
So keep the soil evenly moist and not only will it help witht the splitting, if you have blossom-end rot problems it will help with that, too.
I sure am glad that I am not the only one with tomatoes rotting on the vine. We have also had alot of rain this summer with only two 100 degree days. My Early Girl tomatoes have been split the entire growing period, the Beefsteaks have been half and halfand the Sweetie cherry tomatoes have a slit down the side (almost like they are bursting).
Almost all of my watermelon had split open also (ripe or not).
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