How can I disperse objects with a particle system? I've been working on a project where I need to render a wheat field. I'm using the new cycles hair rendering feature in 2.67. I can't seem to figure out how to render the hair based on an object (which is a wheat mesh). Whenever I set the dupli object, it doesn't render anything at all. Is this a known issue or am I doing something wrong? I am using Blender 2.67.
It's possible that your particles are simply not big enough to see. If you can see them in the viewport, it should render fine.

Also, you don't need hair to instance object(s) on particles, you can do it with normal Emitted particles (to make them static, set the Normal velocity to 0 and also the Gravity weight to 0.

If you still have no luck, try it in an older version of blender (with Emitted particles, not hair) and see if that works. If it does, it's likely a bug that you should report.