The participating farm was
Heron's Nest farm and the farmer was J.J. Haapala who I have noticed
posting to this list from time to time... Perhaps J.J. Haapala can post a
short summary of the study results... or
refer us to an article where the results have been reported...
The 4 treatments were activated carbon, greenmanure, compost and a
treatment using vegetable oil. Winter squash (previously determined to
have a high capacity to absorb organochlorine residues from soil) was
grown on all treatment plots including a control receiving only an N
fertilizer that was applied to all plots.
The study was precipitated by an incident in 1992 when Haapala was unable
to sell a half acre of delicata squash when chlordane was detected in
squash tissue. The study was to take place during the 1996 growing season
and in the fall of 1996 both soil and squash were to be analyzed for
levels of pesticide residues...
Joel Gruver
U of MD, Soil Quality Research
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