Soil is responsible for more than 95% of the food we eat and it underpins Australia's important agricultural sector. Soil provides us with a range of ecosystem services including water filtration and storage, carbon sequestration, nutrient recycling and a habitat for organisms, big and small. In many cultures, including Australia’s Aboriginal culture, soil also provides a rich cultural and social heritage.
However, whilst soil is a resource that provides us with many benefits – economic, environmental and social – it is often unrecognised. Australia’s soil resource is also facing many challenges including erosion, compaction, pollution, acidification, waterlogging, loss of soil biodiversity and salinity. These all negatively affect the soil’s ability to support plant life and grow productive crops and pastures.
Inherent soil constraints such as sodicity, low fertility, various toxicities, high density, hydrophobicity and low biological activity often present themselves and create challenges. This is particularly the case in Australia, where by world standards, our soil resource is comparatively poor in its productive potential.
Many aspects of soil management have been explored in various branches of soil science for years and are well known. The fundamental concepts of soil physics, soil chemistry and soil biology have been known for decades and underpin good soil management by farmers and by other land managers. Driven perhaps by necessity, Australia’s soil scientists have long been recognised internationally as leaders in the field, and have consistently published at a rate higher than the global average.
Nonetheless, Australia’s future soil-related challenges will require new breakthroughs and innovations in science, and this will require broad collaboration and the contribution of discipline expertise from well beyond the normal soil science disciplines.
The Cooperative Research Centre for High-Performance Soils (the Soil CRC) was established in 2017 with funding from the Australian Government and in-kind and cash contributions from its 40 participant organisations. It is the largest collaborative soil research effort in Australia’s history.
Over its 10 year funding period, and hopefully beyond, the Soil CRC is undertaking ambitious soil-related research to give farmers the tools and knowledge they need to improve their soil management and increase their productivity and profitability.
A distinctive feature of the Soil CRC is the way it brings together different scientific disciplines across research institutions from across Australia. Progress in soil research will come from the various sub-disciplines of soil science working together with analytical chemists, material scientists, molecular microbiologists, data analysts, electrical engineers, biogeochemists and information scientists. The interactions of these various disciplines ensure that the latest breakthroughs in other disciplines are soon adapted and applied.
The Soil CRC is distinctive in the way farmer groups work closely together with scientists in developing proposals, implementing research projects, interpreting results and developing conclusions to ensure that all research is end-user focussed, ensuring that the best science is put in the hands of farmers as soon as possible, and in a manner that is relevant to their needs.
As in all areas of endeavour, the ability to measure and monitor performance accurately, rapidly and cheaply is highly valued. Farmers and their advisors typically measure soil fertility by taking a soil sample, sending it to the laboratory and waiting one to two weeks for a result. Whilst this approach will still be the gold standard, Soil CRC research is looking to develop cheaper methods that can give a result in close to real-time and at a price that makes it economically viable.
For instance, researchers at the University of Newcastle and the University of Tasmania are collaborating to develop an affordable field-based tool kit for farmers to quickly determine soil chemical properties on their farms. They are developing a disposable and affordable ‘lab-on-a-chip’ device that can simultaneously determine multiple key soil chemical indicators in the field, using colourimetric methods in a 3D printed microfluidic device. By using this device, soil solutions can be measured directly in the field with a mobile phone, without the sample preparations required of other on-site analysis methods.
At the University of Southern Queensland, scientists are developing hand-held sensor technology that can be used in the field to enable a detailed measurement of soil nutrient status and supply. The sensor technology and algorithms being developed in this research will enable farmers to monitor the distribution of nutrients through the soil profile — enabling a step-change in soil management practices for both profitability and environmental sustainability.
Farmers often intuitively assess soil by smell. The fingerprint of gases emitted from soil may be able to reveal the composition and activity of the microbial community that relates to soil health. Currently, there are no field-based sensors to diagnose soil health using aromas. An ‘electronic nose’ offers a solution to this problem. The prototype eNose is being co-developed by scientists at the University of Tasmania and farmers to ensure that the technology is useful, usable and provides relevant information that is easily interpreted and understood by farmers themselves. Being able to do this will mean that farmers can make the right management decisions to improve crop performance and yield, especially in poor soils. The eNose prototype has been developed and is currently being tested with farmers, with more testing to come.
Other areas of research in the Soil CRC include the development of new products for soil fertility and function, using nanotechnology and organic chemistry to develop viable alternatives to conventional soil fertilisers and amendments, and the development of farming practices and systems that can reliably sequester soil carbon and build soil organic matter to help offset greenhouse gas emissions and improve soil health.
Science and innovation continue to play an important role in ensuring Australian farmers are internationally competitive, whilst managing their soil resource for long term sustainable productivity, and the Soil CRC is making a critical contribution to this outcome.
Dr. Michael Crawford is the CEO of the Soil Cooperative Research Centre
This article is taken from the recently published digital book
Australia's Nobel Laureates Vol III State of our Innovation Nation: 2021 and Beyond