Hi,
I just registered here TODAY and I work at Michigan State University's Entomology Department (I torture bugs, har!). We have a strong International Ag program here at this self proclaimed "World Grant" university, cough cough. If you're still stumped by this problem, holler at me here:
sebolt AT msu DOT edu
Put IRAQ AG in the subject line, spin me up on your progress and I'll see how I can help you. I agree with the others, it starts with a soil test to look at nutrient load. After that, proper crop seed variety. Local or regional varieties are best.

Semper Fi,
Chris