For centuries Native Americans intercropped corn, beans and squash because the plants thrived together. A new initiative is measuring health and social benefits from reuniting the "three sisters."

An invisible crisis is brewing in US farm country as the overpumped Ogallala-High Plains Aquifer drains. The key drivers are federal farm subsidies and the tax code.

New research shows that one-third of yearly nitrogen runoff from Midwest farms to the Gulf of Mexico occurs during a few heavy rainstorms. New fertilizing schedules could reduce nitrogen pollution.