Trafficking a heavy Minnipa soil does not hurt crop production but beware on deep sands

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This article summarises the first four years of crop performance after trafficking was imposed on a red calcareous sandy loam at Minnipa Agricultural Centre (a detailed summary of 2015, 2016 and 2017 results can be found in the 2015, 2016 and 2017 Eyre Peninsula Farming Systems Summaries, respectively). Three other trials similar in design and monitoring have also been implemented across the LRZ – on a deep sand at Loxton (SA), a brown loam near Swan Hill (Vic) and on a deep red earth at Lake Cargelligo (NSW). All these trials except Swan Hill (land ownership has changed) have been maintained for at least the five years of the project. A new trial was set up in 2018 to investigate the role of CTF on a deep sand which has been ameliorated with deep ripping.