Soils provide 99% of our food, but their silent degradation now threatens global food security. Compacted, depleted of organic matter, poorly irrigated, they suffer the consequences of intensive agriculture and climate change, recalled Marc-André Selosse in his book, “The Origin of the World”. However, their condition remains largely unknown, due to a lack of effective, affordable and precise tools. An international team of researchers, notably from the Earth Rover Program, attached to the University of Exeter, Harper Adams University (United Kingdom) and the University of Limuru (Kenya), is responding to this emergency.
Their method, based on the analysis of seismic waves – “soilsmology” – makes it possible to map the health of soils without disturbing them. Their results, published in Environmental Research: Energy, open a promising avenue for reducing inputs, restoring land fertility and anticipating agricultural shortages. Faced with a growing population and falling yields, this approach is resolutely pragmatic.
Understanding the subsoil without damaging it: an approach using seismic waves
The method at the heart of the Earth Rover Program is based on a technique borrowed from geophysics: the propagation of seismic waves in the ground. Concretely, the researchers place a metal plate on the ground, hit with a hammer. This generates waves that travel through the earth. Sensors then measure the return of these waves, modified by the nature of the subsoil crossed. This principle, similar to that used in oil exploration or for the study of earthquakes, applies here on the agricultural scale.
The advantage of this technique lies in its non-invasiveness. Unlike traditional sampling, it does not require digging. This helps preserve the biological and physical integrity of the soil. The measurements obtained reveal with great precision the density, porosity, humidity and compaction of the soil, essential parameters for judging its health.
Professor Tarje Nissen-Meyer (University of Exeter), co-founder of the program, emphasizes that this approach allows “ to understand the internal structure of the soil without damaging it. All while collecting high-resolution data.” The first tests show a vertical resolution of around 10 centimeters, much higher than traditional maps which still use 5 km meshes.
The precision obtained makes it possible to detect fine variations within the same field, invisible to the naked eye or by satellite. This marks an important methodological breakthrough, offering researchers and farmers a three-dimensional reading of the soil. Essential reading for finely adapting agricultural practices and meeting the challenges of sustainable productivity.
Low-cost sensors and AI to democratize soil analysis
Technological accessibility has been at the heart of the Earth Rover Program's concerns. In two years, the price of seismic sensors has fallen from $1,000 to $10 each, thanks to the development of prototypes based on MEMS (microelectromechanical systems) designed to be robust, precise and inexpensive. This spectacular reduction makes it possible to consider global deployment, including in low-resource rural areas.
But data collection is not enough. To make this data usable by non-scientists, researchers developed ERP-GPT, an artificial intelligence model capable of converting seismic signals into clear and actionable information. This system relies on machine learning to interpret parameters such as soil compaction, carbon content, humidity and even root structure.
According to Jacqueline Hannam, soil scientist at the University of Greenwich, this approach makes it possible to “ measure key soil properties without ever taking out a spade “. This is an important step forward in agricultural areas poorly served by scientific infrastructure, recalls FarmUK. Thanks to this technology, a farmer can know in real time whether he needs to loosen his soil, adjust his irrigation or add organic matter, without having to go through laboratories.
The program also aims to create an open and secure data sharing platform. The idea: connect users around the world via a collaborative tool integrating local knowledge into data analysis, for contextualized decision-making. So, soilsmology is not just a technical feat. It is becoming a lever for agricultural empowerment on a global scale.
Responding to the global fertility crisis with targeted action
The world's soils are degrading at an alarming rate. According to estimates from the Earth Rover Program, approximately 75% of Earth's soils show signs of degradation. Which directly affects the capacity of land to produce sustainably. This situation results from erosion, the intensive use of chemical inputs, compaction linked to the passage of agricultural machinery and the effects of climate change.
Professor Simon Jeffery, researcher in soil ecology at Harper Adams University, recalls that “ most agricultural interventions are done blindly. Farmers do not have precise information on intra-plot soil variability.” Indeed, yields can vary greatly on a scale of a few meters. However, due to lack of data, treatments are applied uniformly, causing overdose, pollution and waste.
The approach developed by Earth Rover makes it possible to precisely identify areas that are compacted or deficient in organic elements. This information makes it possible to consider localized actions, such as subsoiling (decompaction) or the targeted addition of compost. This would significantly reduce costs and environmental impacts.
In East Africa, Peter Mosongo, a researcher based in Kenya, cited by The Guardianhighlights the importance of this technology for smallholders. He recalls that many farmers have never been able to have their soils analyzed, due to lack of resources or access to laboratories. However, the accumulation of impermeable layers in the basement prevents water infiltration. It aggravates flooding and blocks root development.
From soil science to a global resilience strategy
Beyond its agricultural applications, the Earth Rover program is part of a systemic approach. The soil is not just a support for crops. It is a complex ecosystem, essential to the water cycle, climate regulation and biodiversity. However, it remains largely understudied today. The scientific community has very few integrated models capable of describing soil functioning at different spatial and temporal scales.
It is this gap that the team of researchers intends to fill. Thanks to data collected via seismic sensors, but also other non-invasive methods such as electrical resistivity and ground penetrating radar (GPR), it becomes possible to model the ground in 3D. And this with sufficient finesse to build “digital twins” of soil systems.
These models certainly integrate the physical characteristics of the soil. But they also integrate their capacities to store carbon or to shelter microbial biodiversity. These data make it possible to develop land management scenarios that take into account climate objectives and conservation requirements.
The team wants to go further with the creation of a global soil condition forecasting system, a “
soilcast ». Inspired by weather models, this tool would offer a dynamic vision of soil health. It would make it possible to anticipate declines in fertility, risks of erosion or amendment needs.
Dr. Andy Jarvis, of the Bezos Earth Fund, financial partner of the program, emphasizes that this technology makes it possible to “
read the invisible world of the ground without destroying it “. By making soils visible, understandable and monitored in real time, soilsmology asserts itself as a technological solution serving a global strategy of ecological resilience.
Source: Maria Tsekhmistrenko et al., “Between two furrows: soil bulk density from non-invasive seismology”. 2025 Approximately. Res. Common. 7 111010
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