Researchers at the Texas Water Resources Institute, or TWRI, recently completed a phase of research in the Rio Grande Coordinated Agriculture Project. The effort looked at area farmers’ use of scientific irrigation scheduling technology and what prevents some from adopting it.
“Irrigation scheduling is a science where we try to find out how much water is required at what time to achieve a certain crop yield goal,” said Ali Ajaz, Ph.D., AgriLife Extension program specialist for TWRI and investigator on the project.
Ajaz explained that few farmers use scientific irrigation scheduling technology. Instead, many farmers across the country, and in the Rio Grande region in particular, still use conventional ways of determining when to irrigate their crops. This can be anything from the feel of the soil, to visually assessing the condition of the crops to even irrigating when neighbors irrigate.
By contrast, scientific irrigation scheduling technology can integrate the use of soil and plant moisture sensing devices, weather data, computer modeling and other integrations of data into decision making. Such technologies can help farmers target their irrigation to the needs of the crop and the soil, thereby making them much more water efficient.
Surveying unique irrigators
The team — which included Allen Berthold, Ph.D., TWRI assistant director; Taylor Olsovsky, TWRI research associate; and Dhruva Kathuria, Ph.D., former TWRI graduate research assistant — sent surveys out to 1,500 Rio Grande irrigators in Texas and New Mexico.
“The survey generally asked about their irrigation scheduling methods and tools, what helps them decide when to irrigate and what factors influence their decision-making process,” Ajaz said.
“We also wanted to see what the main barriers are that hinder the adoption of these modern tools to make irrigation decisions,” Ajaz said.
While some of the recent findings line up with earlier findings about barriers to adoption of scientific irrigation technology broadly in the United States, the research specifically quantified the perspectives of Rio Grande farmers.
“The Rio Grande region is quite unique,” Ajaz said. “The main reason is the majority of the area farmers rely on surface water supplies.”
Reliance on the surface water from the Rio Grande means being at the mercy of Mother Nature — how much water is in the river — and the irrigation districts. Irrigation districts hold most of the water rights along the Rio Grande and work to distribute its limited water for both urban and agricultural needs.
“If farmers want water, they have to ask the irrigation district. But the irrigation district can say, ‘No, it’s not your turn, and you have to wait for a couple days or a couple weeks before you can get the water.’”
Barriers to modern irrigation scheduling technology adoption
While Rio Grande farmers’ lesser control over their irrigation timing impacts the adoption of scientific irrigation scheduling technology, the survey revealed other barriers that played a bigger role.
“Some of the most important adoption barriers were the lack of access to weather data,” said Ajaz. He explained that most modern irrigation scheduling tools are usually coupled with weather data. If an area does not have reliable or varied sources of weather data or weather data networks, the value of the irrigation scheduling tools might be questionable in the eyes of area farmers.
Other barriers to adoption cited by respondents included concerns over the cost effectiveness of the technology, famers’ lack of familiarity with modern irrigation scheduling tools, and associated concerns about potential reduced yields.
“Another major barrier was the uncertainty of future water availability, especially in the Rio Grande region where people have seen several droughts and also the climate change projections are not very promising for the region,” Ajaz said.
“Farmers are hesitant to invest in this technology because they are not sure what the water future looks like.”
Looking to the future of irrigation
The survey also showed that some respondents have already adopted scientific irrigation scheduling technologies. Some of the reasons for adoption were very future-focused.
“For a majority of growers, the biggest factor that pushed them to adopt some of this technology is to maintain the quality of their land,” Ajaz said. “They earn their livelihood from their land, so they are concerned for its quality.”
Salinity is another issue that makes farming and irrigating in the Rio Grande unique. Surface water from the Rio Grande can be very saline. When that water is used on cropland, the salts in the water get deposited into the soil. This can build up over time, rendering soil unsuitable for growing without mitigation efforts.
“If we can link crop-water-salinity production functions with scientific irrigation scheduling to help growers mitigate these issues, it is one big step forward for them and for us as Extension experts,” Ajaz said.
Another encouraging motivator for adopting scientific irrigation scheduling technology that the survey suggested was the farmers’ idea of a duty to future generations. Ajaz called it sustainability awareness.
“We did the survey, and people do think that they are responsible at least to make sure that future generations get the water,” he said. “And now we have quantifiable evidence of that.”