The design and analysis of variety trials using mixtures of composite and individual plot samples

摘要: Field trials for evaluating plant varieties are conducted to obtain information on a range of traits including grain yield and quality. Some quality costly measure so it is not possible test all plots individually. It has therefore become common practice single composite sample each variety in the trial but this precludes use an efficient statistical analysis. We propose approach which proportion tested by using individual replicate samples. The remaining may either be as samples or with reduced replication. This allows application mixed model analyses both inexpensive (using data from complete set plots) expensive subset mixture plot samples).