New replacement sub clover for mid season maturity varieties in Western Australia
Coolamon has been bred as a replacement for Junee sub clover by the Department of Agriculture, Western Australia and is slightly later flowering than Junee, being 125 days at Darkan, compared to Junee 124. Coolamon is suited to areas with annual rainfall greater than 500mm on well drained moderately acid soils and where the growing season extends into November.
Coolamon is moderately hard seeded and can be grown in rotation with crops, provided cropping frequency is no more than 1 year in 3. It is also suited to phase farming and permanent pastures.
The main attributes of Coolamon Sub Clover are:
- Improved persistence compared to other cultivars of similar maturity
- Resistant to clover scorch races 1 & 2, ( race 2 is widespread on the Esperance sand plain)
- Has only trace levels of formononetin
- Increased production will mean more dollars per hectare return and higher nitrogen inputs
Coolamon is susceptible to powdery mildew, but less so than Junee, and is not likely to cause production losses in grazed situations. Some losses may be possible under favorable conditions for the disease when stands are closed up for hay or seed production.
When averaged, Coolamon has 11% better regeneration density and produces 12% more herbage in autumn / winter, 14% more herbage in spring and 6% more seed production than Junee.
In summary Coolamon has a good fit into a wide range of soils in the 500mm plus rainfall zones and will provide increased winter and spring production compared to Junee and other older varieties.
Referenced from SM012 commercialisation paper: PGH Nichols, GA Sandral, BS Dear, CT de Koning, DL Lloyd, PM Evans, AD Craig, MJ Barbetti, M P You, P Si and PF Smith.
Recommended sowing rates: Monoculture: 20 kgs/ha; Mix: 6 to 8 kgs/ha.