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Title: A note on the analysis of early stage breeding experiments Authors:  Stanislaw Mejza - Poznan University of Life Sciences (Poland) [presenting]
Iwona Mejza - Poznan University of Life Sciences (Poland)
Abstract: In plant breeding trials, during the early stages of the improvement process, it is not possible to use an experimental design that satisfies the requirement of replicating all the treatments, because of the large number of genotypes involved, the small amount of seed and the low availability of resources. Hence, unreplicated designs are used for early generation testing when hundreds or even thousands of new genotypes are to be evaluated in the same trial using a limited amount of seed that is enough for one replication only. To control the real or potential heterogeneity of experimental units, control (check) plots are arranged in the trial. There are many methods of using the information resulting from check plots. The main tool for exploring this information will be based on a response surface methodology. To begin with we attempt to identify the response surface characterizing the experimental environments. The obtained response surface is then used to adjust the observations for genotypes. Finally, the adjusted data are used for inferences concerning the next stages of the breeding program. The theoretical considerations are illustrated with an example involving spring barley.