Williams, EmlynJohn, J.A.2015-12-080323-3847http://hdl.handle.net/1885/35323One approach to the design of early generation trials is to have a number of replicated check varieties and a larger number of unreplicated or new varieties. For such trials we define the class of α-α-designs as an extension to the augmented lattice squKeywords: a-designs; Average efficiency factor; Early generation trials; Latinized designs; Resolvable designs; Row-column designs; Unreplicated trials200310.1002/bimj.2003900462015-12-08