A clash of cultures: Why are soil scientists given a bad rap by some regenerative agriculturists?

Emeritus Professor Robert White, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne. robertew@unimelb.edu.au

In the 2006 book ‘Back from the Brink’, farmer Peter Andrews says, ‘we need the scientific community to accept that the approach it has adopted to Australia’s landscape problems so far have been wrong’ (p.7) and that ‘we certainly have to abandon the idea that scientists can provide a solution to our landscape’s problems’ (p.13).

In short, forget about the decades of scientific research into land management if you want to rehabilitate the land.

In 2017, Charles Massy published ‘Call of the Reed Warbler’, which deplores modern industrial farming and asks a rhetorical question about ‘established sources of knowledge—department of agriculture people and the Commonwealth Scientific and Industrial Research Organization (CSIRO)’, claiming that ‘they’re just so far behind’ (p.179).

No soil scientist wants to see land degradation, and Australia has decades of research into land and farm management, which has had positive outcomes. So why is there a clash of cultures when both parties want the same thing?

1. Poor soil science communication

Soil science has not been well communicated, with the majority of research results staying in journal papers. A farmer would need to pay for access, then try and wade through the academic language, and then try to work out how the research applies to their situation. Accessing soil science findings is certainly not frictionless. Formerly, extension officers bridged the gap between the field and the lab, but funding cuts have removed most of these.

2. Resulting dismissal of soil science research

Perhaps because it is difficult to access, interpret, and use existing research, this research is ignored or dismissed. This is a shame because Australia has a wealth of research into interactions among soils, crops, pastures and animals.

Different systems have been studied for many years using a range of biophysical and chemical methods and modelling. For example, Marston and co-workers first unravelled the role of cobalt and copper in ‘bush sickness’ of ruminants, Prescott mapped the extensive distribution of Australian soils, Norrish elucidated the behaviour of soil clays, Rovira explored the management of soil-borne diseases, Lee and Foster showed how soil fauna affected soil structure, and Baldock and co-workers described the dynamics of soil organic carbon and its measurement.

Ignoring this work perpetuates the view that the science underpinning landscape management has not progressed since the early 1800s, a view not borne out by the evidence of many studies.

3. Limited research and claims about regenerative agriculture

Australia’s National Advocate for Soil Health admits in a letter to the Prime Minister that ‘the reasons why the innovative methods developed by Soils for Life and other farmers are working so well are generally not well understood by science. More research is needed into the microbiological processes in the plant and soil biomes thought to be responsible for the success of various regenerative farming practices.’

Additionally, some examples of success within regenerative agriculture contain dubious claims that sound warning bells for soil scientists. For example, in Call of the Reed Warbler, Massy (p.201) cites a case study where ‘despite no superphosphate for over 35 years, phosphorus and other trace element and mineral levels have risen substantially, soil pH having jumped from high acidity levels to nearly neutral’. Bearing in mind the law of conservation of matter, how can these increases have occurred in a production system unless there were substantial inputs of materials from off-site during the 35 years?

In another example, Massy (p.140) states that a 1% increase in soil carbon (C) allows 144,000 litres of extra water to be stored per ha to 0.3 m depth. This corresponds to an increase in the amount of stored water to 0.3 m depth of 14.4 mm. Here, ‘traditional’ soil scientists start to ask questions as no information is given about the soil type for this claim. We know that the effect of organic matter in increasing soil water storage is more important in sandy than clay soils. However, in France Morlat and Chaussod looked at soil carbon after applications of compost and manure on a sandy soil (86% sand). Compared to the control soil, organic C approximately doubled from 0.63 to 1.21% for soil treated with 20 t/ha of fresh cow manure each year for 28 years. But the increase in available water in the top 0.3 m was only 7.5 mm after 28 years, which is a much smaller response than that claimed by Massy. Knowing the soil and treatment conditions under which Massy’s result occurred would be enormously helpful so that it could be implemented elsewhere. But these details were not supplied.

4. Resulting caution from soil scientists

As with enthusiastic farmers who have tried new methods and had success, soil scientists too are excited by unusual or extreme behaviour in soil-plant-animal systems. However, they need information about the conditions under which unusual results are obtained.

You’d be hard-pressed to find a soil scientist in 2019 willing to roll out a new land management practice using data from one trial at one site. If something works, we need to determine whether it can work in other climates, soil conditions and production systems. We also need to be careful about unintended consequences.

Sub clover is a case in point of the latter. The widespread adoption in southern Australia of pastures based on sub clover (Trifolium subterraneum) previously led to accelerated acidification in soils that were poorly buffered. However, field research has evolved from relatively simple plot-based experiments to large-scale ecosystems studies. This progression demonstrates that soil scientists have not been static in their thinking. The science has evolved and continues to do so. Some regenerative agriculture practices could well be the next sub clover example, that looks good to start with until you realize on a wider scale that you should have done more research.

Next steps

First, we need to get over this ‘clash of cultures’ and collaborate. Australia’s soil advocate calls for ‘collaboration between scientists and successful farmers to build knowledge, collate the evidence to support successes and improvements and promote the wider use of regenerative farming techniques’. Let’s work together to understand how and where regenerative agriculture works, identify possible problems, and work out the economic benefits. Farming is a business. If a practice is not economic for the farmer, it won’t happen.

Second, soil scientists need to communicate in a language that farmers and their champions in the media understand. This does not mean dumbing down the science, but it does mean scientists must challenge unorthodox views and seek explanations using language that an intelligent layperson can understand.

Third, we need true engagement from the lab to the field: that is, farmers, community groups and scientists working together to devise farming systems that halt degradation, improve soil quality and are economically viable. We have had such programs in the past. For example, the Sustainable Grazing Systems program, led by Meat and Livestock Australia in conjunction with other funding partners, was a 6-year program of collaboration between farmers and researchers with many insights gained from working on farmers’ properties. Let’s not ignore the good work such programs have done.

Working together we can understand how best to manage our land, providing substantial benefits to Australian farmers, international science and the Australian economy.

 

This article was originally published as a journal paper. Alisa Bryce collaborated with the author to convert the paper into this article for wider distribution in the media.

References

  1. Andrews, P. Back from the Brink; ABC Books: Sydney, Australia, 2006.
  2. Massy, C. Call of the Reed Warbler; University of Queensland Press: Brisbane, Australia, 2017.
  3. Marston, H.R.; Lines, E.W.; Thomas, R.G.; McDonald, I.W. Copper and cobalt in ruminant animals. Nature 1938, 141, 398–400. https://www.nature.com/articles/141398a0
  4. Prescott, J.A. A climatic index for the leaching factor in soil formation. J. Soil Sci. 1950, 1, 9–19. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2389.1950.tb00714.x
  5. Norrish, K. The swelling of montmorillonite. Discuss. Faraday Soc. 1954, 18, 120–134. https://pubs.rsc.org/en/content/articlelanding/1954/DF/df9541800120#!divAbstract
  6. Rovira, A. The impact of soil and crop management practices on soil-borne root diseases and wheat yields. Soil Use Manag. 1990, 6, 195–200. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1475-2743.1990.tb00835.x
  7. Lee, K.E.; Foster, R.C. Soil fauna and soil structure. Aust. J. Soil Res. 1991, 29, 745–775. http://www.publish.csiro.au/sr/SR9910745
  8. Luo, Z.; Wang, E.; Baldock, J.; Xing, H. Potential soil organic carbon stock and its uncertainty under various cropping systems in Australian cropland. Soil Res. 2014, 52, 463–475. http://www.publish.csiro.au/sr/SR13294
  9. Soils for Life. Available online: www.soilsforlife.org.au (accessed on 11 February 2019). http://www.agriculture.gov.au/SiteCollectionDocuments/ag-food/publications/restore-soil-prosper.pdf
  10. Bauer, A.; Black, A.L. Organic carbon effects on available water capacity of three soil textural groups. Soil Sci. Soc. Am. J. 1992, 56, 248. https://dl.sciencesocieties.org/publications/sssaj/abstracts/56/1/SS0560010248
  11. Morlat, R.; Chaussod, R. Long-term additions of organic amendments in a Loire Valley vineyard. I. Effects on properties of a calcareous sandy soil. Am. J. Enol. Vitic. 2008, 59, 353–363. https://www.ajevonline.org/content/59/4/353
  12. Williams, C. Soil acidification under clover pasture. Aust. J. Exp. Agric. 1980, 20, 561–567. http://www.publish.csiro.au/an/EA9800561
  13. Mason, W.K.; Lodge, G.M.; Allan, C.J.; Andrew, M.H.; Johnson, T.; Russell, B.; Simpson, I. An appraisal of Sustainable Grazing Systems: The program, the triple bottom line impacts and the sustainability of grazing systems. Aust. J. Exp. Agric. 2003, 43, 1061–1082. http://www.publish.csiro.au/an/EA03043
  14. White, R. E.; Andrew M. Orthodox soil science versus alternative philosophies: A clash of cultures in a modern context. Sustainability2019, 11, 2919; doi:10.3390/su11102919

 

Emeritus Professor Robert White

Author of ‘Principles and Practice of Soil Science’ 4e, 'Understanding Vineyard Soils' 2e, and 'Soils for Fine Wines'

Consultant in soils to the wine industry; Honorary life member Soil Science Australia

Honorary member International Union of Soil Sciences