If one starts with a finite field (F,+,.) and changes the multiplication in skillful way,
one obtains a generalized ring (a planar near-ring) (F,+,*) which is the source of numerous
ways to create Balanced Incomplete Block Designs. These, in turn, give rise to very efficient
experimental designs which are easy to construct. This talk aims to study this connection
and to show the use of these experimental designs in (of course, finite) experimental fields in
agriculture.