[n the tropics, soybeans theoretically can be grown year around. The rainfall pattern distinguishes the soybean crop as either wet season or dry season. Rainfall at harvest time invariably causes sprouting of the seeds in the field and can result in a total loss of the crop.
Shanmugasundaram, S. and Toung, T. S.
"Research Notes : Forcing soybeans to mature by spraying paraquat,"
Soybean Genetics Newsletter: Vol. 9
, Article 34.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol9/iss1/34