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Lethbridge College irrigation research to measure available field water

Dr. Willemijn Appels (second from right) working with students in an irrigated field.

Irrigation researchers at Lethbridge College have long been working on optimizing the amount of water needed to grow crops in a variety of fields, but new funding will allow the team to get a more accurate view of how much moisture is present below the surface, with a goal of allowing producers to adjust irrigation on the fly.

Dr. Willemijn Appels, the college’s Mueller Applied Research Chair in Irrigation Science, has received more than $420,000 for the new three-year project.

This project is funded by Results Driven Agriculture Research. 

The research will use microwave radiometer technology to create maps of the water in the soil that is available to plants and translate that data to adjust how much water is added through irrigation.

Appels has worked with Skaha Remote Sensing, the B.C. manufacturer of this technology, before and learned it can map moisture in the top 60 centimeters of the soil.

“This technique gives us a map of the moisture in an entire area, instead of just a point observation you get when you install something in the ground,” Appels said. “It gives promise that you can adjust your irrigation water management to match what is already present in the ground, and actually adjust while the pivot is moving because the sensor is located on top of the pivot.”

“Ideally, in the future, the sensors would be used to estimate soil moisture conditions just ahead of the sprinklers. Then after doing some calculations the amount of water the sprinklers put on would be adjusted while the pivot is moving.”

Dr. Willemijn Appels, Lethbridge College Mueller Applied Research Chair in Irrigation Science.

Most producers base their irrigation levels on a rough classification of available moisture, based on general texture classifications.

The data collected in this study aims to provide a more precise and repeatable measurement to take some of the guess work out of irrigation.

“In this project, we plan to figure out how we can make the estimates either easier or determine what strategy producers could apply to map out their property,” Appels said. “Producers can then take their observations and match it with data from those sensors and calculate how much water is needed when factoring in how much is already available in the field.”

The three-year project begins this spring and takes place on the Alberta Irrigation Technology Centre, management of which was transferred to Lethbridge College by the government of Alberta in October.

 It is one of the first major college projects since the college assumed management, and the site will allow Appels to expand her research capabilities.

Maik Wolleben, the lead developer of this technology at Skaha, is excited to continue the trials at the demonstration farm.

“Our sensors are unique because they can remotely sense soil moisture in the root zone while being installed on irrigation pivots and other machinery that travels across fields,” Wolleben said. “This gives farmers, consultants, and researchers a flexible and inexpensive tool to map the spatial distribution of water.”

Appels, who has previously relied on partnerships with producers to access fields, adds, “It’s great we have a place that we can come back to easily where we don’t interfere with someone else’s business. We can dry out a piece of land to wilt a crop or stretch some things to the limit to test technology, without destroying some yield of a farmer’s crop. The technology we test is not quite farm ready, so having a step in between where we can test it at the right scale is a great opportunity.”

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