"The biggest misconception is that organic farming does not use fertilizer, herbicides, or pesticides." (Dunning, Brian. "Organic vs. Conventional Agriculture." Skeptoid Podcast. Skeptoid Media, Inc., 11 Aug 2009. Web. 15 Aug 2011. http://skeptoid.com/episodes/4166. Well, if that were true, it would be extremely difficult to raise crops with all the challenges farmers face with insects, nematodes, soil type and fertility, etc. There is a “National List” for which some of it specifically applies to organic farming allowances. There are some synthetic materials allowed for use in organic farming on that list. https://attra.ncat.org/attra-pub/org_fert/#WhatCanI
(Dunning, Brian. "Organic vs. Conventional Agriculture." Skeptoid Podcast.Skeptoid Media, Inc., 11 Aug 2009. Web. 15 Aug 2011. (http://skeptoid.com/episodes/4166) It is also important to note that much of Mother Earth's contamination is from other activities and businesses and not from farming. Ice melt and salt applied to roads in the winter and run-off from factories and mills are two such examples.
As you know, I have always stated that one should stay away from systemic chemicals. We don't use them and don't think they are safe or good for the crops.