USDA Researcher, Frank Forcella at Morris, MN MN Star Tribune have been attempting to combine the corncob bits with cornmeal and other organic fertilizers to develop an organic weed and feed combination. His research on corn row crops is availabe as a pdf at ( Weed Technology 2012 26:161-164 ).
According to Mr. Forcella, using the initial prototypes, the current cost of application is 5 times the cost of chemical herbicides. Cost of application is expected to fall as the machinery becomes mass produced and the technology improves. Sam Wortman at the University of Illinois has focused on the horticultural applications for weed control in tomatoes and broccoli.
Ror information on the USDA grant see Development and Demonstration of a New Method of Physical Weed Control with researchers Frank Forcella and Sharon Clay, SDSU.