Reference has been made to the culture of soybeans (Glycine max [L.] Merrill) in Vietnam by Louriro (1793) and Rumphius (1747) as far back as the eighteenth century. Wild soybean (Glycine laotica) is present in Vietnam, having been collected by Harmand (1877) in the area of Hue and the Bassac River in the 19th century. Kwon (1969) speculated that since the history of Vietnam is related closely with China, there is little doubt that soybeans have been grown for many centuries in this country.
Tin, Chu Huu
"Research Notes : Rhizobium japonicum inoculation on Glycine max in
Soybean Genetics Newsletter: Vol. 7
, Article 36.
Available at: https://lib.dr.iastate.edu/soybeangenetics/vol7/iss1/36