ROSA provides a cost-effectiveness ranking of soil amendment options to address one or more soil constraints within a farm business. It highlights the potential cost-effectiveness of one or more soil amendments in the short and long-term at a paddock or farm scale. Costs and benefits of amendment options, and combinations, are accrued at different points in time over a 10 year period.
It does not include every soil constraint within cropped soils of Western Australia nor all available amendment options, but rather a set of the most common constraints and options for comparison and their expected costs and benefits.
Five soil constraints are able to be considered in ROSA, these are:
- topsoil acidity
- subsoil acidity
- subsoil compaction
- soil structure decline.
Soil amendment options then ranked within ROSA are:
- deep ripping (>40cm)
- liming to address topsoil acidity
- liming to address subsoil acidity
- soil mixing (<40cm)
- wetting agents.
ROSA can be used by the user with very little input data:
- a budget for soil amendments
- ag soil zone
- soil type
- current and potential yields
- soil properties (ranked as low, medium or high except for soil pH).
The user can also choose to explore more details if they wish.
If you are interested in trying ROSA before a finalised tool version is available mid-2018, contact Jeremy Lemon who will provide a preliminary version and talk users through it.
A demonstration of ROSA will be held at the Grains Research Updates in Perth in February 2018. If you are unable to make this event but would like to register your interest for a demonstration of ROSA, contact Jeremy Lemon.
This tool was prepared by the Department of Primary Industries and Regional Development's Economist, Dr Elizabeth (Liz) Petersen for the Grains Research and Development Corporation Soil Constraints West initiative: DAW00244 – Water repellence; DAW00243 – Soil compaction; DAW00242 – Subsoil constraints understanding and management; DAW00236 – Soil acidity.