C & M Nursery

I bought a C&M Nursery Naranjo Navel orange plant in 2.8 t container at Lowes and all the roots are straight down . I have never seen containers like these before and it seems odd that the roots should be planted straight down . Tried to find planting instructions on computer . but none for these types of containers . Can not even find these types of plant pots on the computers . Where do you get info on these things .By the way I do grafting etc and have planted lots of fruit trees so I am not new at this.