http://www.sciencedaily.com/releases/2007/07/070716134018.htm
Healthful Compounds In Tomatoes Increase Over Time In Organic FieldsScience Daily —Levels of flavonoids increase over time in crops grown in organically
farmed fields, according to a rare long-term study scheduled for
publication in the July 18 issue of ACS’ Journal of Agricultural and
Food Chemistry, a bi-weekly publication.
Researchers
compared levels of key flavonoids in tomatoes harvested over a 10-year
period from two matched fields -- one farmed organically and the other
with conventional methods that included commercial fertilizers.
(Credit: iStockphoto/Jim Jurica) Other research has suggested that consumption of flavonoids may protect against cancer, heartdisease, and other age-related diseases.In the new study, Alyson E. Mitchell and colleagues compared levels of key flavonoids in tomatoes harvested over a 10-year period from two matched fields — one farmed organically and the other with conventional methods that included commercial fertilizers. The research focused on tomatoes
because per capita consumption in the United States is so high, second only to potatoes. Researchers analyzed organic and conventional tomatoes that had been dried and archived under identical conditions from 1994 to 2004.
“
The levels of flavonoids increased over time
in samples from organic treatments, whereas the levels of flavonoids
did not vary significantly in conventional treatments,” their report stated.
Increases corresponded with the accumulation of soil
organic matter in organic plots and with reduced fertilization rates.
“Well-quantified changes in tomato nutrients over years in organic
farming systems have not been reported previously.”
Note: This story has been adapted from a news release issued by American Chemical Society.
résumé: les tomates en bio, après 10 ans de conduite biologique de la parcelle, sont plus riche en flavonoïde que les tomates conventionnel.
Les flavonoïdes protègent contre le cancer, les maladies lié à l'age et les maladie cardiaques