The response of Phalaris tuberosa and other grasses to seasonal heavy stocking on the southern tablelands of New South Wales

Seven perennial grasses were evaluated for animal production and for persistence, when stocked heavily in summer or winter with young Merino wethers. The commercial strain of Phalaris tuberosa L., which is sown commonly in south-eastern Australia and is often low yielding during summer and winter, was taken as the standard. At first, the productivity of Bromus inernis Leyss. in summer and Dactylis glomerata L. (Brignoles strain) in winter was reflected in higher liveweight and wool yields for these seasons. This advantage over Phalaris was lost when the Bromus pasture weakened in the third summer and the Dactylis in the third winter. The latter sward revived by natural regeneration from seed, whereas P. tuberosa developed and maintained a dense sward of the original plants. On this evidence Bromus and Dactylis are possible replacements for Phalaris for specific seasonal purposes, but management to retain vigorous swards still needs study. These aspects are discussed.