Smart Irrigation Systems: Can Soil Sensors Help Farmers Save Water and Reduce Electricity Costs?

Farmers often irrigate fields according to a fixed schedule or visual checks. This can lead to unnecessary watering in some conditions and water stress in others. Soil moisture sensors offer another approach by measuring how much water is present in the root zone, helping farmers decide when irrigation may be needed.

A basic sensor-based system includes moisture sensors, a control unit and an irrigation arrangement. Depending on the design, the system can alert a farmer when soil becomes dry or automatically switch a pump or valve on and off. More advanced systems can combine soil readings with weather data and crop requirements.

The Indian Council of Agricultural Research (ICAR) is working on precision-agriculture technologies through its Network Programme on Precision Agriculture, involving 16 ICAR research institutes. The programme includes sensor-based irrigation and fertigation systems, alongside digital tools for monitoring crop and soil conditions.

Five Things Farmers Should Know Before Investing

1. Choose Sensors for Your Crop and Soil

Different soils hold water differently. Sandy soil generally drains faster than clay-rich soil, while crops with shallow roots may need different monitoring from deep-rooted crops. Farmers should select sensors suited to their soil type, crop and irrigation method rather than relying on a single reading for every field.

Ask an agriculture expert or equipment supplier where the sensors should be installed and how many are needed. One sensor may not represent a large or uneven field. Soil moisture readings also need interpretation because the appropriate threshold depends on crop growth stage and local conditions.

2. Match the System to Your Irrigation Method

Smart controls can be connected to drip irrigation, sprinklers or other compatible systems. Drip irrigation delivers water near plant roots, while sensors can help determine when watering should begin. The combination may be particularly useful for orchards, vegetables and other crops where irrigation can be scheduled in smaller, targeted applications.

Farmers using flood irrigation should not assume that installing a sensor alone will save large amounts of water. Field levelling, water availability, irrigation scheduling and the crop’s needs also matter. The system must fit the farm’s existing infrastructure and the farmer’s ability to operate and maintain it.

3. Calculate the Full Cost

The total cost can include sensors, a controller, valves, wiring, connectivity, installation and repairs. Systems that send readings through mobile networks may also involve recurring charges. Farmers should request a complete quotation and check whether the equipment comes with installation, training and after-sales service.

Compare these costs with current irrigation expenses, including electricity or diesel, labour and the cost of pumping water. Savings will depend on the farm’s existing watering practices and local conditions. Farmers who already irrigate carefully may see smaller benefits than those who frequently overwater their fields.

4. Check Whether Automation Is Necessary

A farmer does not always need a fully automated system. A basic sensor that displays soil moisture can help guide manual irrigation, while a controller can operate pumps or valves automatically. The simpler option may be more suitable where farmers want to test the technology before making a larger investment.

Before choosing automation, check power supply, water pressure, pump compatibility and repair arrangements. Ask the supplier how the system behaves during a power failure or sensor malfunction. Farmers should also know how to override automatic controls when field conditions require an immediate change.

5. Keep Records to Measure Results

Record irrigation dates, pumping hours, crop growth and any changes in yield. Compare these observations with earlier seasons, taking account of differences in rainfall, temperature and crop variety. A short trial on part of the farm can help establish whether the system is useful before investing across the entire holding.

Farmers should not judge the technology only by the number of times a pump switches on or off. The important questions are whether the crop receives enough water, whether water use changes and whether total production costs fall. Keeping records can help answer these questions more reliably.

Can Government Programmes Help Farmers?

ICAR promotes demonstrations and farmer training in precision agriculture, including sensor-based irrigation and nutrient management. Farmers can contact their nearest Krishi Vigyan Kendra (KVK), state agriculture department or agricultural university to ask whether demonstrations or technical guidance are available locally.

The Sub-Mission on Agricultural Mechanization (SMAM) supports eligible farm machinery purchases and custom hiring facilities, but farmers should not assume that every sensor or smart irrigation product qualifies. Assistance depends on the equipment, scheme guidelines and state-level implementation. Confirm current eligibility and application procedures with the relevant department before purchasing.

Farmers can also explore whether local farmer producer organisations or cooperatives can purchase equipment for shared use. Shared systems may reduce the initial cost per farmer, provided members agree on access, maintenance, responsibility for repairs and how operating expenses will be divided.

Sensors require correct installation, calibration and maintenance. Poor placement can produce readings that do not represent the crop’s root zone, while damaged equipment or unreliable connectivity can interrupt monitoring. Farmers need basic training to understand the readings and respond appropriately.

Smart irrigation cannot solve every water problem. If a farm lacks a dependable water source, automation cannot create additional water. The technology is most useful when farmers combine reliable measurements with suitable irrigation methods, sound crop management and a realistic assessment of costs.

Smart irrigation systems can help farmers make better-informed watering decisions and may reduce avoidable water use. Their value depends on soil conditions, crop needs, equipment reliability and the cost of installation. Farmers should start with local technical advice, compare alternatives and test the system before committing to a large investment.