Do high yielding soybeans need to be fertilized with nitrogen?

Soybeans are effective scavengers of available soil nitrogen, but they are recognized for their ability to "manufacture" the majority of their own nitrogen needs via biological nitrogen fixation. That biological nitrogen fixation depends on a symbiotic association with specialized bacteria that live in nodules on the plant's root system. When available soil nitrogen supplies are short or the biological nitrogen fixation processes become limited, could soybeans benefit from fertilizer nitrogen? The PNT article below sheds more light on this question.

PNT. Spring 2012. Dr. T. Scott Murrell