The test was conducted on a brown, silty, clay loam. The soil was quite acid for soybeans, but it is fairly representative of the soil types in the area. With a pH of 5.1, there was an adequate amount of available calcium; however, the availability of N, P, and K was quite low.
Chu, Huu Tin
"Research Notes : Vietnam : Exotic soybean yield performance trial in the Mekong Delta in SR Vietnam,"
Soybean Genetics Newsletter: Vol. 13
, Article 52.
Available at: https://lib.dr.iastate.edu/soybeangenetics/vol13/iss1/52