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'Tailored' water -- the latest in lawn care
Date:7/10/2014

In Santa Fe, Albuquerque, and other major cities in New Mexico, nearly every public golf course is now watered with treated municipal wastewater rather than precious potable water supplies. Across the U.S. Southwest as a whole, more than 40% of all golf courses receive treated effluent. Reusing the effluent increases the sustainability of golf courses.

Additionally, golf courses and homeowners alike fertilize their lawns during the growing season. The major nutrient in fertilizer is nitrate. A New Mexico State University turfgrass expert has a new vision for even more efficiency.

Bernd Leinauer, a turfgrass expert at New Mexico State University, suggests combining "fertigation," drip irrigation, and decentralized water treatment. In a paper published in the journal Crop Science, he and co-author Elena Sevostianova detail their modern-day recipe for a lush, green lawn.

Leinauer says combining the three approaches could solve several issues. Right now, many big New Mexico cities remove nearly all the nitrate from wastewater all the time. That's an expensive and energy-intensive step designed to prevent pollution of surface- and ground- waters. "But from a turf perspective that doesn't make a whole lot of sense," Leinauer says, since golf course managers (and homeowners) end up applying mineral nitrate fertilizers to keep turf thriving.

Fertigation is a method of supplying fertilizers to plants through irrigation water (fertilize and irrigate at the same time). Drip irrigation delivers water directly to plant roots underground, instead of sprinkling plants from above.

In Leinauer's and Sevostianova's vision, a decentralized treatment system at a subdivision would be "tailored" to generate effluent during the summer that contained 15 parts per million (ppm) of the nutrient nitrate. Residents would then use this water to fertigate their lawns. Because drip systems put water directly into the soil, Leinauer sa
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Contact: Susan Fisk
sfisk@sciencesocieties.org
608-273-8091
American Society of Agronomy
Source:Eurekalert  

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