My tomatoes have finally started to ripen. Some have turned uniformly
red, but many turn red up to the crown where spots of green remain.
Also, the tomato splits deeply, fanning out from the stem. The taste is
fine. I simply cut off the top of the tomato.

Any idea why this happened? Our summer has been *unusually* dry, and
I've been watering once a day for about 1/2 hour using a soaker hose.