Rock Phosphate and superphosphate as sources of phosphorus for subterranean clover on an acid sandy soil

Waite Agricultural Research Institute Glen Osmond, SA Trial location: Mount Compass (SA)
  • Randomised block with 4 replications
  • RPR & SSP applied at 4 different rates
  • P applied autumn of the first year only
  • Dry matter yield measured Oct/Nov annually
  • Soil P levels evaluated annually post-harvest

Summary of findings

RPR & SSP outperformed the control in all 3 years of trial.

RPR outperformed SSP in year 1 at application rate of 66kg/ha (other rates had similar results).

By year 3, RPR outperformed SSP at all application rates.