It appears to be a variety of rice. I don't know whether it stands for Basse Guinée or not (I have doubts) but in any case it's not translated or expanded.

http://www.rice.ac.lk/research_disciplines1_tables.html

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Note added at 1 hr (2009-01-30 07:40:06 GMT)
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Variety from Sri Lanka - developed at Batalagoda Station

http://books.google.com/books?id=LqVtjGMicoEC&pg=PA1&lpg=PA1...

Depends on your context I guess. On the other hand in a French text concerning Africa it could well be Basse Guinée I guess.

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Note added at 1 hr (2009-01-30 07:42:42 GMT)
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Sri LankaReported in 1990, BG varieties with 90 days growth duration during Yala season at Central Rice Breeding Station, Batalagoda ...
www.fao.org/docrep/005/Y4347E/y4347e1n.htm

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Note added at 1 hr (2009-01-30 07:54:22 GMT)
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Have a look here in this book about rice in Niger. Do a search on BG. It brings up "BG 90-2" which is one of the varieties mentioned in the Sri Lankan document (my first link).

http://books.google.com/books?id=1cyEUFi7XnUC&pg=PA141&lpg=P...