ecologic earthworm

       For some people they look really disgusting but they are really useful. they could be called soil engineers. Their activity make them one of the major actors of the soil. They air, fertilize and structure it, therefore they are a utility for agriculture.
   
        An experience has been made to show that they could purify dirty water. It's because potentially they can eat their own weight in impurities daily, we are waiting test validation to confirm that. But it could be an interesting idea.

        Unfortunately these worms are sensitive to some agricultural techniques such as ploughhing or phytosanitary products utilisation. These techniques lead to a decrease in the diversity of species and could have consequences in the soil performance.

For more informations : http://en.wikipedia.org/wiki/Earthworm
                                           http://opentutorial.com/index.php?title=Make_a_worm_farm

Camille