A press release on ScienceDaily summarizes a new study comparing how long seeds from two species of weeds (Chenopodium and Amaranthus, Amaranthaceae) survive under conventional vs. organic farming:
The answer: no strong conclusion either way, the result is mixed. Here is the original article: LINK (doi: http://dx.doi.org/10.1614/WS-D-10-00142.1)
