Facey Group Logo 180

Ri$kWise Quantifying the Impact of Soil Amelioration on Nitrogen Fixation

Key Messages

  • As soil amelioration techniques are becoming more widespread, a better understanding of their impacts on nitrogen fixation is required.
  • This trial will investigate if soil amelioration alters the rate at which nitrogen fixes in the soil and what is the optimal rate of nitrogen for the following season’s wheat crop.


The project is part of the GRDC-funded RiskWi$e initiative, spanning five years. In 2023, the Facey Group investigated the impact of various soil amelioration treatments on the rate of nodulation in lupins. Treatments included Discorden On-Pass Finisher, K-Line Speedtiller, and small plots with Clay application at 250 t/ha to 25cm and a Reefinator H4. This aims to understand the effects of soil amelioration practices on nodulation in lupins and may prompt further trials with nitrogen-fixing crops on recently treated soils.

The next phase, in 2024, will continue with Discorden One-Pass Finisher and K-Line techniques. The focus will be on assessing different nitrogen application rates on a wheat crop to determine if soil amelioration varies the amount of nitrogen that is fixed in the soil from the lupin crop.


To support Facey Group with this and other ongoing research please consider becoming a member. Click HERE for more information.


Project Funding: GRDC

Project Lead: Facey Group

Project Collaborators: GGA, CSIRO

Project Start Date: February 2023

Project End Date: February 2024

Host Farmers: Alan Manton and Kelly Pearce

Facey Group Logo 180

Contact Us

Phone: (08) 9888 1223

Facey Group Inc
40 Wogolin Rd
Wickepin, WA 6370
Postal: PO Box 129,
Wickepin, WA 6370