Drone-mounted lab tests nitrate in remote farm waterways
A drone-mounted lab can test nitrate in farm drainage water in seven minutes.
The system, developed by researchers at Iowa State University, is designed for tile drainage outlets and shallow waterways that are often difficult to reach with conventional sampling equipment. The drone flies to a test site, collects water through a pump and hose, runs the sample through an onboard sensing unit, records nitrate levels, flushes the system and moves to the next location.
Nitrate monitoring is a major issue for drinking water management and agricultural runoff control. Nitrates are federally regulated in drinking water and can contribute to marine dead zones when excess nutrients leave fields and enter downstream waterways.
The payload uses commercially available screen-printed carbon electrodes and a custom membrane that allows nitrate ions to pass through and generate a measurable electrical signal. Its sensor, pump system, electronics and mounting hardware cost less than $135, with onboard electronics controlling the pumps, running the sensing system and storing measurements on a memory card.
The project is backed by a three-year, $590,000 grant from the U.S. Department of Agriculture’s National Institute of Food and Agriculture, with additional support from the U.S. National Science Foundation and Iowa State’s Digital and Precision Agriculture Applications program. Researchers said the platform could be adapted to detect pesticides and bacteria, making low-cost drone-based monitoring a potential tool for precision agriculture and faster environmental decision-making.