In Florida, irrigation water-use accounts for around 50% of total household water consumption. Most of the single-family homes recently
built in Florida (as well as in the U.S.) include an automatic irrigation
system, which results in an increase in demand from already limited water
resources.
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| Save water, Florida! Courtesy: EPA WaterSense |
The development of best management practices for
irrigation of landscapes has become an undeniable strategic, economic, and
environmental issue for the state. New soil moisture sensor systems (SMSs) for
landscape irrigation control may improve irrigation efficiency, promote water
conservation, and reduce environmental impacts of over-irrigation.
Sensing savings
A research project was funded by the Southwest Florida Water Management District to evaluate SMS-based irrigation systems. The
main goal: to determine if SMSs could reduce the water applied, compared to
common time-based irrigation schedules implemented by homeowners. At the same
time, we wanted to know if these hypothetical water savings could be achieved
without compromising an acceptable turf quality.
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| On the corner of research & technology: the plots |
The experimental area (at UF research facilities in Gainesville)
consisted of common bermudagrass plots (10 x 10 ft). The sensors of four
commercially available SMS systems (brands Acclima,
Rain Bird, Irrometer, and Water Watcher)
were buried at the 7 to 10 cm depth. For comparison purposes, time-based treatments
with and without a rain sensor, and a non-irrigated treatment were also implemented.
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| Proper soil moisture sensor installation with Bernard Cardenas |
Non-irrigated, but green
During the 2-year experiment, normal/wet weather conditions prevailed in the research area, which favored turf growth and development. As a result, no significant differences in turfgrass quality among treatments were detected, even when compared to the non-irrigated plots. This means that, for sustained normal/wet weather conditions in Gainesville, a bermudagrass turf probably would not need supplemental irrigation.
During the 2-year experiment, normal/wet weather conditions prevailed in the research area, which favored turf growth and development. As a result, no significant differences in turfgrass quality among treatments were detected, even when compared to the non-irrigated plots. This means that, for sustained normal/wet weather conditions in Gainesville, a bermudagrass turf probably would not need supplemental irrigation.
Regarding the SMS treatments, most of them recorded
significant irrigation water savings compared to the time-based irrigation
schedules. Savings ranged from 69% to 92% for three of the four SMS brands
tested. The treatment with-rain-sensor, on the other hand, resulted in 34% less
water applied than the without-rain-sensor treatment. All these water savings
were achieved without decreasing turfgrass quality below acceptable levels.
Time to validate
Therefore, SMSs represent a promising technology for water conservation, even better than the rain sensors mandated by FL law. Given these results, we then sought to test SMSs under sustained dry weather conditions and in residential irrigation systems.
Therefore, SMSs represent a promising technology for water conservation, even better than the rain sensors mandated by FL law. Given these results, we then sought to test SMSs under sustained dry weather conditions and in residential irrigation systems.
This research was conducted by Mr. Bernardo Cardenas, Dr. Michael D. Dukes and Dr. Grady Miller.
Bernardo Cardenas has a M. Sc. in Agricultural and Biological Engineering, from UF. He
specializes in smart water application technology research, but refuses to irrigate his own lawn.
