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Abstract
Abstract 415 ryegrass genotypes, collected from pastures on soils of different exchangeable magnesium concentration, together with 160 genotypes from 8 commercial cultivars were examined for variation in herbage magnesium concentration. There was no evidence for ecotypic or cultivar differences in magnesium concentration, but there was substantial variation within all populations. Magnesium concentrations up to 0.552% of DM were found. When a high magnesium selection of perennial ryegrass was tested further, indications of genetic control of herbage magnesium concentrations were obtained. Within this selection there were positive correlations between cOl1centrations of magnesium and potassium, calcium, iron, copper, manganese, and zinc, but a significant negative correlation with sodium. It is concluded that there is scope for selection of high-magnesium ryegrass, but sodium content would have to be monitored.
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