However , the details of where , when , and under what circumstances soybean developed a close relationship with people are poorly understood .
Soybeans became an important crop by the Zhou Dynasty ( c. 1046 -- 256 BC ) in China .
The details of where , when , and under what circumstances soybean developed a close relationship with people are poorly understood .
Soybeans became an important crop by the Zhou Dynasty ( c. 1046 -- 256 BC ) in China .