Any producer that sells a growing crop to be harvested and marketed by another person is entitled to assent to, or vote in a referendum, if both of the following requirements are complied with:
(a) At the time of sale of such growing crop the producer retains the exclusive right so to assent or to so vote.
(b) The quantity of such growing crop can be determined to the satisfaction of the director.
(Enacted by Stats. 1967, Ch. 15.)