University of California Cooperative Extension Specialist Jeff Mitchell

University of California Cooperative Extension Specialist Jeff Mitchell is leading a study of overhead irrigation systems to see how the technology will work in various crops grown in in the Golden State. Results are mostly encouraging for many of the crops studied

Could overhead irrigation work in California?

Overhead irrigation has not been popular in California System is widely adopted elsewhere in the United States University researchers are studying its use in various California cropping systems for its positive benefits

Overhead irrigation systems have revolutionized agriculture across the United States and in other parts of the world, using less water than furrow irrigation and requiring significantly less labor and maintenance than drip systems.

But in California, the No. 1 agriculture state in the nation, it hasn’t gotten off the ground. That could be changing.

University of California Cooperative Extension and Fresno State agricultural production scientists researched overhead irrigation at the UC West Side Research and Extension Center for five years, growing wheat, corn, cotton, tomato, onion and broccoli, comparing them with crops produced under furrow and drip irrigation.

With all of them except tomato, overhead irrigation led to similar or increased yields, according to the scientists’ report published in the current issue of California Agriculture Journal.

“Overall, we are very encouraged by these results, and they reflect the experiences that many California farmers have recently been having with overhead irrigation systems,” said lead author Jeff Mitchell, UC Cooperative Extension specialist.

“We’ve confirmed that overhead irrigation systems work in California. We also concluded that there are opportunities to get even better results with more research and experience, particularly when overhead irrigation is coupled with practices that preserve crop residues and rely on reduced tillage.”

The article co-authors are Anil Shrestha, weed scientist at Fresno State; Joy Hollingsworth, UCCE staff research associate; and Dan Munk, Kurt Hembree and Tom Turini, UCCE advisors in Fresno County.

The tomato yields under overhead irrigation were disappointing, particularly since tomatoes have a prominent role in many Central Valley annual crop rotations.

“This isn’t a simple process,” Mitchell said. “You can’t just turn it on and let it go. It will require focused and dedicated farmer and researcher attention and innovation to solve.”

The authors are working with a team of Central Valley tomato farmers, processors, irrigation experts and research colleagues to improve overhead irrigation management in tomatoes. They are encouraged by the success of Walnut Grove farmer Michael Boparai, who achieved profitable processing tomato yields with overhead irrigation.

Half the U.S. farmland uses it

Overhead irrigation systems were invented more than 60 years ago. They now irrigate 50 percent of total U.S. farm irrigated acreage. In Nebraska, 87 percent of irrigated land is under overhead systems. By contrast, in California overhead systems irrigate only 150,000 acres, just 2 percent of the state’s irrigated farmland.

Mitchell and his co-authors outlined several factors that contributed to its slow rate of adoption in California:

  • Early adopters ran into serious problems, giving the systems an undeserved bad reputation that persists even though in recent years California farmers are using the systems successfully;
  • Center pivot systems typically leave the corners of the field un-irrigated, which can reduce production; and,
  • Purchase and installation cost of the overhead system is substantially higher than furrow irrigation.

The UC and Fresno State research has shown many advantages:

  • Overhead irrigation can be managed remotely and automatically;
  • The system can accommodate different terrain and soil types;
  • Overhead systems require less maintenance than drip systems in terms of avoiding clogging of emitters and repairing leaks;
  • Overhead irrigation may also help with salinity management by uniformly leaching salts from a crop’s root zone; and,
  • Precision irrigation, including overhead systems, are becoming ever more critical with coming groundwater regulations, surface water cuts and the increasing cost of water for farmers in California.

A significant advantage of overhead irrigation is its compatibility with other farm management technologies that optimize the farming system and reduce costly inputs, including water, fuel, labor and fertilizer.

“We’re committed to continuing our work on the whole package – reduced tillage, preserving residue, improving water infiltration, improving soil water-holding capacity and increasing productivity uniformity – a system that we refer to as conservation agriculture,” said Mitchell.

“We are working to encourage adoption of conservation agriculture in crops where viability of the system is well established, and facilitate the research and innovation needed to optimize conservation agriculture production in additional crops.”

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