Maximising pasture production from phosphatic fertilisers whilst minimising environmental impact

This research project is investigating the short-term effectiveness (up to 2 years) of phosphatic fertilisers under typical conditions experienced in irrigated dairy pastures of northern Victoria.

The project aims to evaluate phosphate losses to irrigation channels from irrigated dairy pastures receiving either reactive phosphate rock, partially acidulated or conventional phosphatic fertilisers and comparing the environmental losses with the agronomic benefits.

Expected Research Outcomes:

• A demonstration of the value of alternative phosphate fertilisers for maintenance of pasture productivity whilst minimising off site impacts.
• A robust economic evaluation of alternative phosphate fertilisers under irrigated and/or rain-fed dairy pastures in Victoria.
• An evaluation of the impact of irrigation re-use systems on the dissolution of sparingly soluble phosphatic fertilisers.
• A demonstration of appropriate fertilisers in high-risk environments.

How these research findings will contribute to the region:

This study will assist us in developing appropriate of nutrient management strategy for the Goulburn-Broken Catchment Management Authority which is aiming to achieve a 65% reduction in phosphorus loads to streams and rivers by 2016.

Funded by: National Institute of Water and Atmosphere (NIWA, Australia).

Research Team:

Contact for further information: Dr Tony Weatherley, anthony@unimelb.edu.au