Here is some watering advice found in Organic Gardening magazine's summer 2007 issue:
Watering the soil deeply but infrequently encourages robust root development. They suggest wetting the top 6-8 inches of soil when you do water, which is about 13 minutes of watering. "Water, then wait about half an hour and see how deep the water went," instructs Don Schultz, the horticulture manager at the Water Conservation Garden at Cuyamaca College in El Cajon CA. "Determine the length of watering time based on how deep the water went." You can then assess watering frequency based on how quickly the soil dries out. Wait to water again until the soil has dried at least 2 inches down from the surface.
It's also important to observe your plants. If they look water-stressed then you should water them right away rather then waiting until your next scheduled watering session. As a general guideline, water established plants until soil soaked 6-8 inches down twice a week. More recently planted vegetables may need to be watered more often until they develop larger root systems.
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