What could be the reason of not getting a scholarship?

Me and my friend recently got admitted into the Plant Biology PhD program in Rutgers, but I got the offer much later than them. They got a scholarship but I didn't.

Could it be because I got a 3.09 CGPA in my Master's and/or I didn't bother contacting a supervisor beforehand? I would be very lucky to pursue a higher education there, but I can't afford the plane tickets let alone the tuition fees.