A field study by researchers of the Commonwealth Science and Industrial Research Organization (CSIRO) and University of Sydney in an arid area of Western Australia showed a 36% increase of wheat crop yield when pesticides were not applied.

The better harvest is attributed to the enhanced water absorption enabled by ant tunnels and better soil nitrogen levels which the termites facilitate.

Kudos, Australian scientists, on your significant discovery. May organic agriculture be adopted by all for a flourishing ecosphere.
http://www.physorg.com/news/2011-03-ants-termites-boost-wheat-yields.html
http://www.newkerala.com/news/world/fullnews-179761.html