Productivity and seedling recruitment of naturalised annual clovers versus sown clovers Trifolium repens and Trifolium subterraneum

Naturalised annual clover (NAC) species (suckling clover, cluster clover, striated clover, and haresfoot clover) are commonly present to locally abundant in summer dry hill and high country areas where white and subterranean (sub) clover abundance is limited. This field trial investigated NAC species dry matter production and seedling regeneration compared to white and sub clover. Autumn seedling recruitment was measured in response to low (75 kg/ha) or high (200 kg/ ha) superphosphate (SP) application. Over two growing seasons, NAC species contributed >90% to pasture legume content while white and sub clover contributed <10%. Striated, suckling, and cluster clovers showed greater recruitment under low SP with 996, 978, and 227 seedlings/m2 respectively compared to high SP with 635, 466, and 123 seedlings/m2 respectively. Collectively, NAC species were superior to white and sub clover on north-facing slopes. Spreading NAC species seed via livestock dung dispersal and aerial broadcasting would further increase their contribution to total pasture DM and nitrogen input.

[1]  T. Maxwell,et al.  Phosphorus response and efficiency of four adventive annual clovers grown in a New Zealand high country soil under glasshouse conditions , 2013 .

[2]  T. Maxwell,et al.  Sulphur and lime response of four adventive annual clovers grown in a New Zealand high country soil under glasshouse conditions , 2012 .

[3]  T. Maxwell,et al.  Influence of environmental factors on the abundance of naturalised annual clovers in the South Island hill and high country , 2010 .

[4]  D. Moot,et al.  Soil pH, exchangeable aluminium and lucerne yield responses to lime in a South Island high country soil , 2010 .

[5]  D. Moot,et al.  Thermal time requirements for germination, emergence and seedling development of adventive legume and grass species , 2009 .

[6]  A. Rose,et al.  Rapid short-tussock grassland decline with and without grazing, Marlborough, New Zealand. , 2007 .

[7]  R. Tillman,et al.  Can phosphorus fertilisers alone increase levels of soil nitrogen in New Zealand hill country pastures? , 2006, Nutrient Cycling in Agroecosystems.

[8]  David R. Power,et al.  Clover species cover on summer dry hill country in Central Otago , 2006 .

[9]  D. Moot,et al.  Can topdressing with salt increase oversowing success and pasture quality on steep, south facing slopes in hill country pastures? , 2006 .

[10]  K. F. O'connor.  Conflicting Innovations: A Problem for Sustainable Development of New Zealand High-Country Grasslands , 2003 .

[11]  D. Moot,et al.  Effects of grass suppression on legume abundance during two contrasting seasons on a summer-dry hill country site. , 2003 .

[12]  M. Daly,et al.  White clover: loss in drought and subsequent recovery. , 2003 .

[13]  D. Moot,et al.  The ecology of four annual clovers adventive in New Zealand grasslands. , 2003 .

[14]  M. Gray,et al.  Pasture responses to phosphorus and nitrogen fertilisers on dry hill country , 1998 .

[15]  M. Dodd,et al.  Seasonal growth, flowering patterns, and phosphate response of 18 annual legume species grown in a hill‐country soil , 1995 .

[16]  M. Bounejmate,et al.  Distribution of annual Trifolium species in Morocco , 1993 .

[17]  P. Williams,et al.  Nutrient cycling and soil fertility in the grazed pasture ecosystem , 1993 .

[18]  C. J. Webb,et al.  Flora of New Zealand Volume IV: Naturalised Pteridophytes, Gymnosperms, Dicotyledons , 1990 .

[19]  D. Edmeades,et al.  LIME AND PHOSPHORUS REQUIREMENTS FOR HILL COUNTRY YELLOW-BROWN EARTHS , 1984 .

[20]  A. C. Archer,et al.  Management of grassland on the sunny aspect of North Canterbury dry hill country: environment and quantity and quality of herbage , 1982 .

[21]  M. G. Lambert,et al.  Aspect differences in an unimproved hill country pasture , 1976 .

[22]  J. E. Radcliffe.  Seasonal distribution of pasture production in New Zealand , 1974 .

[23]  R. Langer,et al.  Oversowing grasses on sunny and shady faces , 1972 .

[24]  H. H. Allan.  Flora of New Zealand. Volume I. , 1961 .