Jeff McCormick1, Zoe Lynch2, Jason Condon1
1 Graham Centre for Agricultural Innovation (Charles Sturt University and NSW Department of Primary Industries), Locked Bag 588, Wagga Wagga NSW 2678, email@example.com,
2 Heritage Seeds, “Shrublands”, 4421 Riverina Highway, Howlong NSW 2643
A plot experiment was conducted to determine a critical phalaris basal frequency for pasture production. Small plots (0.84m2) in an existing phalaris pasture were modified to a range of basal frequencies (40-50%, 30-39%, 20-29%, and 10-19%). Pasture dry matter and composition was assessed during the growing season. Phalaris production was reduced when basal frequency was below 20% but growth of annual grasses and subterranean clover resulted in no differences for total seasonal production. The addition of nitrogen increased total pasture production by 37% but reduced clover production by 45%. It is suggested that if basal frequency of phalaris is below 20% then management strategies need to be implemented to increase basal frequency or re-sowing the pasture should be considered.