Dear Taab

Please find the attached papers related to your request.

All the Best,

Ramin

See: 

Weed and Crop Allelopathy, Critical Reviews in Plant Sciences

Volume 22, 2003 - Issue 3-4, http://dx.doi.org/10.1080/713610861.

Weeds grow bigger and taller in corn than by themselves. And inversely, corn grows less among weeds. So you could develop a protocol to investigate this :-)

Dear Taab,

While going through your topic, I got some excellent publications. Please find these, as it may help you while standardising your protocol.  

Dear Taab

Please find the attached papers related to your request.

All the Best,

Ramin