The regents of the agricultural college of New Mexico [New Mexico state university] are hereby authorized and empowered upon application and hearing as hereinafter provided to designate, outline and specifically delimit areas or zones of agricultural lands within which only one variety or strain of any designated plant or crop, species or nearly related species of plant or crop for the purpose of seed production may be planted, grown or allowed to grow to maturity, or within which any specimen or specimens, beds, plots or fields of another variety or varieties of plants of the same or nearly related species may be allowed to grow to the stage in which buds are developed.