As I was wondering what happened to corns to have such big price fluctuation in this two weeks, this article gives such a fully explained analysis:
http://www.agrimoney.com/news/corn-soy-prices-retreat-on-informa-crop-revisions–5073.html
I have concluded that what made me lose money in the first two trading weeks is not following the upcoming USDA report, so I have downloaded a Schedule of 2012 release dates of cotton reports issued by the U. S. Department of Agriculture, according to which USDA is coming out with another report on 11th October and I get to make moves as the coming report!
http://usda.mannlib.cornell.edu/usda/ams/CNAASRD.pdf
http://www.agrimoney.com/news/wheat-output-poised-for-significant-rise-in-2013–5063.html