Extension Program

The Regenerative Agriculture Alliance has just completed eight research and extension projects worth $2.5 million, funded by the Federal Government Department of Agriculture, Fisheries and Forestry.

Aimed at quantifying the benefits of regenerative agricultural practices in restoring degraded soils across Australia over three years, the research took place in bio-regions around the country. This applied collaborative research, focused on the impacts of using regenerative practices to restore degraded soils and increase soil carbon.

The program included these trials:

Multispecies cover crops in subtropical horticultural plantations

Professor Terry Rose – Australian Macadamia Society Limited, Australian Subtropical Coffee Growers’ Association Incorporated – Northern Rivers, NSW

Macadamia growers in the Northern Rivers of NSW have been removing tree rows to enable ground covers to develop between rows to reduce erosion during heavy rainfall events. Changes in light, airflow and plant species have likely implications for pest and beneficial insect ecology as well as soil health. This project, in partnership with the Australian Macadamia Society, the Australian Subtropical Coffee Growers’ Association and local avocado grower networks, measured changes in soil health and insect ecology in macadamia, coffee and avocado plantations with either permanent groundcover or annual mixed species cover crops between rows, re-sown continuously following termination with a roller crimper.

Multispecies summer cover crops for Western Australian cropping systems

Professor Terry Rose – Facey Group Inc – South-Western WA

Western Australian cropping systems typically involve a summer fallow kept free of weeds using herbicides, due to concerns that the use of stored soil moisture by weeds over summer may impact on growth and yields of winter cash crops. The aim of this project was to investigate summer moisture and soil properties, and winter crop yields, then multi-species cover crops are grown during the fallow. The trial established by the Facey Group near Wickepin in South West Western Australia included single and multi-species summer cover crops compared to a typical chemical fallow. Both economic and environmental measurements, particularly soil health, were taken throughout the trial.

Investigating the benefits of multispecies cover crops in low rainfall mixed farming systems

Professor Terry Rose – Birchip Cropping Group – Wimmera Mallee, VIC

This project aimed to validate the benefits and shortcomings of using multispecies cover-crops to replace long fallows in a low rainfall broadacre mixed farming system in the Victorian southern Mallee. The project partnership with Birchip Cropping Group focused on providing outcomes to benefit mixed farming practices where livestock supplements a winter cash-crop operation. A replicated trial will be designed to evaluate the effects of cover crops and include practices for improved soil health, cover crop establishment, management and termination, biomass production and groundcover.

Dr Terry Rose

Soil Carbon Research Program 2.0 - A 20-year data set to understand the effect of farm management on soil organic carbon

Professor Terry Rose – Birchip Cropping Group – Wimmera, Mallee VIC

This project in partnership with Birchip Cropping Group identified potential farm management practices in the Wimmera Mallee that have a positive influence on Soil Organic Carbon (SOC) and build drought resilience in agricultural soils. The project builds on the Soil Carbon Research Program (SCaRP) 2009-2012, the largest soil sampling and analysis program undertaken in Australia to measure stocks of soil carbon and record associated management practices. SCaRP found that management practices of the last 10 years were not significantly related to SOC levels. This project will revisit, retest and resurvey 15 sites to measure potential changes in SOC and collect management data to collate over 20 years of management data, providing a longer timeframe from which to draw better conclusions on if and how farming practices are influencing soil carbon.

Effects of pesticides on soil microbial diversity and bioreactors to attenuate run-off on blueberry farms

Professor Kirsten Benkendorff – NC Local Land Services, Coffs Harbour City Council, Coffs Harbour Regional Landcare – Mid North Coast, NSW

A wide range of pesticides are used by intensive agricultural industries on the Mid North Coast of NSW, with potential for build-up of chemical residue in the soils. On blueberry farms, methods for reducing pesticide use include weed matts and/or mulch and growing winter crops under plastic tunnels. Little is known about the retention of pesticide residues using these different farming methods or how they impact soil microbial health in this region. During major rain events, pesticides in the soil, as well as spray residues from hothouses can also be mobilised and leach into adjacent land and water ways. North Coast Local Land Services, Coffs Harbour City Council and Coffs Harbour Regional Landcare project partnered with us to test the effectiveness of a bioreactor for facilitating biodegradation of these chemical residues. We applied a replicated sampling design to investigate the relationship between pesticides, soil health and microbial communities on blueberry farms and in a hothouse run-off bioreactor .

Integrate biochar in to regenerative agriculture practices using biochar supplemented animal feed and dung beetles

Professor Stephen Joseph & Don Coyne – ANZ Biochar Industry Group, Soft Agriculture Pty Ltd – Northern Rivers, NSW

This project in partnership with ANZ Biochar Initiative Inc and Soft Agriculture Pty Ltd aimed to develop an economically and biologically efficient method to restore compacted and depleted soils in Northern NSW. Regenerative agricultural practices such as biochar supplemented feed, dung beetles, rotational grazing, foliar sprays and biopesticides containing biochar and wood vinegar will be used to increase and improve pasture and other cover crops. Changes to soil carbon, other trace elements, water holding capacity and the release of nitrous oxide were measured and assessed as well as the health and weight gain of the cows.

Central Victorian Regenerative Farmers (CVRF) Multi Species Cover Cropping & Regenerative Pasture Management Project (‘Beckworth RegenAg Project’)

Professor Terry Rose & Dr Abe Gibson – Central Victorian Regenerative Farmers Inc (CVRF), Learmonth Foundations Pty Ltd, Paraway Pastoral Company Limited, University of Melbourne – Central VIC

This project evaluated the potential for improvements to soil health, ecological resilience and increased profitability when using multi-species cover crops and perennial pastures accompanied by a program of intensive planned grazing in a livestock-based farming system in Central Victoria. The research, conducted with partners Central Victorian Regenerative Farmers, Learmonth Foundations and Paraway Pastoral Company Limited will determine whether there is a measurable improvement in soil health indicators by implementation of these regenerative practices compared with conventional pasture establishment, management and grazing practices.

Measurement of changes in soil organic carbon levels in response to new regenerative farm management practices by graziers in the Northern Tablelands, North West Slopes and Plains and the Northern Rivers of NSW

Professor Terry Rose – Casino Food Co-op, The Living Classroom and Carbon Farm, Bingara – Northern Tablelands, North West Slopes and Plains and the Northern Rivers of NSW

This project investigated how graziers can restore degraded soils, increase soil organic carbon levels and increase productivity through the implementation of new best practice regenerative farming techniques in different bioregions with varying annual rainfall and soil types. Southern Cross University researchers worked with graziers associated with industry partners Casino Food Co-op and The Living Classroom and Carbon Farm, Bingara. Regenerative agricultural techniques included rotational grazing practices, multi-species plantings, composting and broad-acre biochar application. The impacts of the use of soil ameliorants or fertiliser, and the over-sowing of summer-dominant perennial pastures with mixed species winter forage crops to fill the winter feed gap will also be investigated in relation to soil health, function and carbon.

This project was jointly funded by Southern Cross University and the Australian Government’s National Landcare Program.

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