The Onion Field in Wisbech as a Turning Point
A 12-hectare field cultivated with Allium cepa, managed by Martin Sons in Wisbech, UK, recorded a 40% reduction in herbicide consumption after the implementation of the spot sprayer. The system was installed in June 2026, during the critical period for weed management. James Martin (65) and his son Joshua (21), who have run the business for generations, directly assessed the results five days after the first treatment. The data shows a radical change in the herbicide management model: no more uniform application across the entire surface, but targeted intervention only in areas with weeds.
The physical mechanism is based on real-time analysis of images obtained from optical sensors and AI. The system identifies individual weed plants, calculates the exact amount of herbicide needed for each point, and applies it with centimeter precision. This eliminates the overspending associated with grid treatment—a practice that in Italy causes an average loss of 31.5% of overall yield per crop. The economic savings are immediately visible: €120/hectare on annual variable costs, with a direct impact on gross margin.
The Limitation of Traditional Weeding and Its Evolution
The practice of grid weeding has persisted for decades, despite data showing an efficiency below 5%. According to the SoilEssentials report, the SKAi system — similar to that used by Martin Sons — manages to reduce herbicide waste by 95%. In conditions of prolonged drought, such as those recorded in southern England between April and June 2026, treatments with Stomp and Wing P herbicides showed a reduced effectiveness of 58% compared to normal. This was due to the poor mobility of the product in dry soil.
The combination of water stress, delays in treatment scheduling (caused by external contract overload), and the inefficiency of uniform distribution led to a 23% increase in the number of corrective interventions. Furthermore, the repetition of applications under prolonged rainfall — as recorded in the two weeks preceding the spot sprayer treatment — further compromised the product’s effectiveness and increased operating costs. The solution was not simply technological substitution, but a rethinking of the intervention logic: from a preventive strategy to a response activated only on real signals.
The Redistribution of Costs in the Agricultural System
The adoption of spot spraying has modified the distribution of costs among different nodes in the supply chain. Martin Sons, a company managing 12 hectares with intensive onion cultivation, saw the variable cost per hectare decrease from €840 to €720—a reduction of 14.3%. This saving was not entirely retained by the company: part of it was passed on to the technology provider (AgXeed), which achieved a 9% increase in the volume of services offered in the region. However, the company’s gross profit margin increased from €320/ha to €440/ha, with an estimated net profitability of 56% for the 2026 agricultural year.
The change also influenced contractual relationships. External service providers had to renegotiate rates, reducing the hourly cost of treatment from €18 to €13 per hectare—a decrease of 27.8%. At the same time, the demand for specialized labor in the field of agricultural robotics has grown: in Cambridgeshire, between April and July 2026, 14 new contracts were registered for technicians dedicated to monitoring autonomous systems. This indicates a redistribution of value from physical inputs (herbicides) to specialized human inputs.
Economic Impact and Future Prospects
The net effect on the company’s economy is measurable: with a reduced variable cost of €120/ha, the gross margin increases from €320 to €440 per hectare. This increase is not temporary—the analysis of the biological cycle of onions (DAE 98–156) indicates that weed resistance to targeted treatment remains below the critical level of 0.7 for each application. The risk of developing resistance is 42% lower than with traditional methods.
The future outlook is clear: the adoption of spot spraying is not simply a technological improvement, but a restructuring of operational logic. For agricultural companies with high-value crops and tight margins, such as onions in England, the entry cost of the system (approximately €280,000 for a complete installation) can be recovered within 3 years. The indicator to monitor is the ratio between variable costs and net yield: if this exceeds €1.65/qli in more than two consecutive harvests, the technological intervention becomes mandatory for economic survival.
Photo by Bernd 📷 Dittrich on Unsplash
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