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Yes—steam can suppress soilborne pathogens and weeds, and researchers are adapting soil steaming for faster, more economical use in open fields. The most visible current work is in California strawberry production, where early field observations are promising but do not yet establish steam as a dependable, cost-effective replacement for fumigation.
How soil steaming works
Before planting, equipment heats water to produce steam and delivers it into the soil. Sufficient heat exposure can kill or suppress some soilborne pests and weed seeds in the treated area. The result depends on conditions such as temperature, exposure time, soil and treatment depth; steaming does not automatically sterilize an entire soil profile.
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A USDA Agricultural Research Service abstract published in 2010 cited 70 °C for 20 minutes as a threshold for effectively killing soilborne pests in the context of its mobile applicator research. That is a research-specific reference point, not a universal operating prescription for every organism, soil or machine. In a Salinas demonstration trial reported in the same abstract, steam-treated plots had 76% lower initial weed density than untreated controls.
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Why researchers are testing it in strawberry fields
Steam has a history of use in greenhouses, but applying it quickly and economically across field beds is a different engineering problem. California is a consequential test case: Associated Press reported in October 2026 that the state grows nine out of 10 strawberries produced in the United States and has about 35,000 acres (14,000 hectares) of strawberry fields.
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Researchers are evaluating steam as one possible way to address soilborne disease and weed pressure before planting. University of California, Santa Cruz researcher Jenny Broome described the effort as revisiting an older technology and engineering it for more efficient use. The goal is not simply to make heat: equipment must treat field beds fast enough, reach useful temperatures in the soil, and do so at a cost growers can manage.
What California field trials have shown so far
Broome told the Associated Press that four California growers took part in trials the preceding fall. On Rod Koda’s farm, steam-treated plots had less Fusarium wilt damage and produced more berries than comparison plots, according to Broome’s account. Koda reported that his organic strawberries from particular plots were nearly twice the amount he had grown the previous season. These are early, farm- and plot-specific observations, not a generalized yield result or proof that steaming will produce the same outcome elsewhere.
A USDA Agricultural Research Service project record describes preplant trials in organic and conventional strawberries in the Watsonville/Salinas and Oxnard regions. The planned comparisons include steamed and non-steamed soil, and fumigated soil on conventional farms. The work also specifies pathogen assays and sequencing-based characterization of soil microbial communities. The record lists the project period as February 1, 2025, through January 31, 2026.
What remains uncertain
Speed and cost at field scale
Researchers are still working to increase application speed and make treatment cost-effective. A completed UC Davis-led project record likewise identifies traditional steaming methods as slow and expensive and describes improving speed and cost effectiveness as project aims. Its record reports a cumulative award of $499,875 for the 2020–2024 project; that figure is the project award, not the price of a machine or the cost of treating a farm.
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For historical context only, the USDA ARS 2010 abstract reported Sterilter operation costs of $3,848 per acre in November 2009. That old figure is not a current market price and cannot establish today’s economics. Growers would need current information on equipment, fuel, labor, treatment rate and field conditions before comparing costs with alternatives.
Effects on soil biology
Heat may affect beneficial as well as harmful organisms in treated soil. The California strawberry project includes microbial-community characterization, while a separate USDA ARS high-tunnel tomato project tracked microbial recovery and impacts on plant and soil health. Those project descriptions make soil biology part of the question; they do not establish that the microbiome is unaffected or that recovery happens uniformly.
The Ohio project record describes comparisons between steaming and anaerobic soil disinfestation for high-tunnel tomatoes, including adoption barriers. It lists a project period from January 1, 2024, through June 30, 2026, so it should be understood as a recorded project, not evidence that the work remains active after its listed end date.
Whether it can replace fumigation
Steam is being studied alongside established approaches, not demonstrated as a universal substitute. The California ARS trials include comparisons with fumigated soil on conventional farms, and the UC Davis project examined field performance, soil-temperature targets, fuel use and economics. The evidence described so far does not establish broad commercial adoption or economic competitiveness.
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Nor should all steam systems be described as chemical-free: the completed UC Davis project record also discusses studying steam with additives, including allyl isothiocyanate and heat-generating compounds, as well as steam alone. Whether a particular approach uses an additive depends on the system being evaluated.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to judge a future field-scale system
A useful comparison should look beyond whether a treatment raises soil temperature. For a grower considering an option—or a reader following the technology—key measures include:
- Control: which pathogens and weeds are suppressed, and how consistently under field conditions.
- Crop results: yield, quality and crop health across farms, soils, varieties and seasons.
- Treatment conditions: temperature, exposure time and depth reached in the bed.
- Field capacity: how quickly equipment treats an area and whether it fits planting schedules.
- Soil biology: effects on microbial communities and how they change during recovery.
- Economics and fit: fuel, labor and equipment costs compared with fumigation or other approaches, for the specific crop and growing system.
The current work is best understood as field-scale development: a familiar greenhouse technique is being adapted and measured for agricultural beds. Early California observations provide a reason to keep testing, but faster application, viable costs, crop performance and soil-community effects all matter before growers can judge whether it is a practical alternative.
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