Low-Cost Sensors, Big Impact: Rethinking Soil Health Management in India

India’s Soil Health Card (SHC) scheme is one of the world’s largest soil management initiatives and is a nationwide mandate under the Ministry of Agriculture. The scheme aims to provide farmers with scientific, soil test–based nutrient recommendations to improve agricultural productivity and ensure long-term soil sustainability. While its reach is extensive, the system largely functions as a static advisory tool.

The Soil Health Card records soil parameters such as nutrients, organic carbon and pH, but these are typically measured once every two to three years. It does not account for real-time soil moisture, a factor that directly influences crop growth, irrigation efficiency and fertiliser uptake. As a result, the effectiveness of SHC recommendations often depends on how well farmers manage irrigation in the field.

Against this backdrop, a soil moisture monitoring device developed by Dr. Pratibha Warwade and her research team from the Central University of Jharkhand (CUJ) has gained importance after being granted a patent. The Internet of Things (IoT)-enabled device has been designed as part of a smart irrigation system for vegetable and fruit crops cultivated under drip irrigation.

The device works by measuring real-time soil moisture and environmental conditions and automatically regulating irrigation based on these inputs. By reducing reliance on manual labour and fixed irrigation schedules, it allows farmers to apply water only when required, improving accuracy and efficiency in irrigation management.

While the Soil Health Card indicates what nutrients the soil requires, the CUJ-developed device helps determine when irrigation should be applied so that those nutrients are absorbed effectively. Together, they bridge the gap between soil diagnosis and soil management, transforming periodic soil testing into actionable, field-level decision-making.

Automated moisture-based irrigation helps prevent overwatering, reduces nutrient leaching and improves fertiliser-use efficiency. It also supports water conservation and protects soil structure, contributing to better long-term soil health outcomes, which are central objectives of the Soil Health Card scheme.

Although the Soil Health Card is a centrally mandated programme, its implementation is largely driven by state governments. This allows innovations such as the CUJ device to be tested through state-level pilot projects involving agriculture departments, Krishi Vigyan Kendras, horticulture missions and farmer producer organisations. The reported interest shown by the Madhya Pradesh Agriculture Department reflects this potential pathway for adoption.

Affordability remains a critical factor for scaling any technology nationally. The CUJ device has been described as low-cost compared to similar products available in the market, increasing its suitability for small and marginal farmers. Low maintenance requirements and durability will further determine its scalability under government-supported programmes.

The integration of real-time soil moisture data also aligns with India’s Digital Agriculture Mission, which seeks to digitise soil information and enable data-driven advisories. Sensor-based inputs can complement digital Soil Health Cards by supporting more precise, plot-level irrigation and crop management decisions.

Globally, several countries have moved towards combining laboratory soil analysis with real-time field monitoring. Nations such as Brazil, China, Australia, the United States and parts of Europe increasingly rely on soil moisture sensors and precision irrigation to improve productivity while conserving water and maintaining soil health.

For Jharkhand, where smallholder farming and horticulture play a significant role in rural livelihoods, smart irrigation technologies can help stabilise yields, reduce labour dependence and improve resilience to rainfall variability. The innovation developed at CUJ therefore holds relevance not only nationally but also for the state’s agricultural context.

Developed in collaboration with a research team from Indira Gandhi Agricultural University, Raipur, the patented device also highlights the role of public universities in translating academic research into field-ready solutions. CUJ Vice-Chancellor Professor Kshiti Bhusan Das has described the achievement as an example of research contributing directly to societal welfare.

The Soil Health Card scheme laid the foundation for scientific soil assessment in India. Integrating real-time soil moisture monitoring into this framework could help transform it from a static advisory mechanism into a dynamic soil management system, strengthening India’s move towards precision agriculture, resource efficiency and sustainable farming.