CRP is short for Conservation Reserve Program. Farmers can enroll thier land into it for a set number of years and still recieve payment off it from the goverment. In exchange for this money, the farmers can not use it for any purpose of farming, cash crop, grazing, ect. To help insure the land does not erode during this period and to help provide more wildlife habitat, the farmer is required to seed it down to various types of permanent grasses. Quite often the length of time the land is enrolled in CRP is 10 or more years so unless the land was just brought into the program and seeded down, you won't just find a wide open field.