Relationships between wheat varieties on the basis of grain yield for South Australian farms

Abstract

In South Australia there were 116 receival sites for wheat grown on farms in the 1984-85 and 1985-86 seasons. The amounts received were recorded according to variety, and in this study an analysis was carried out of the yields of the top 15 varieties for the two seasons.Distribution maps were produced for two of the varieties to demonstrate how the distribution of a variety can be related to environmental factors. A measure of association was calculated for each pair of varieties and graphical representations of the inter-varietal distances were obtained from principal coordinates analyses. Examples were given of closely associated varieties for which the probable link was tolerance to boron toxicity, for one pair of varieties, and resistance to cereal cyst nematode, for a second pair of varieties.