NOTES ON THE VARIANCE OF RELATIVE YIELD AS A MEASURE OF STABILITY

The actual yields from multilocation variety trials are commonly analy sed as a two-way table (rows = varieties, columns = locations) of mean yields. In this paper, relationships between the recently proposed ne w stability parameter 'variance of relative yield' and the two stabili ty parameters of the 'classical joint regression approach in stability analysis, are investigated. The variance of relative yield as a measu re of stability exhibits an undesirable dependence on the mean yield o f the respective variety. Generalizations and improvements of some rec ent results and conclusions of Piepho (1994) are discussed.