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Bryan Pagel looks on in front of the digester on his Wisconsin dairy farm.


             Products such as one produced by Pivot Bio,      pipe dream that most of us thought would never
             a startup based in Berkeley, Calif., that can    occur in our lifetimes,” Matlock said.
             help crops fix, or capture, their own nitrogen,   Here is a look at some of the major technologies
             are potential game changers because of the       under development:
             effect they would have on the greenhouse gas
             emissions of animal feed, according to Marty     BIOLOGICALS
             Matlock, executive director of the University
             of Arkansas Resiliency Center and a profes-            Benefits: Cut nitrous oxide emissions by
             sor of ecological engineering who advises              reducing the amount of nitrogen fertilizer
             sustainability programs for numerous farm              that plants require or by increasing soil
             commodities.                                           carbon levels.

             It may take a while to perfect the products, but       Prospects:  Farmers who have tried
             feed accounts for such a large part of the carbon      them say they can reduce fertilizer usage
             footprint of hogs, chickens and turkeys that corn      while making them eligible for payments
             capable of fixing its own nitrogen could lower         through emerging carbon markets.
             the greenhouse gas emissions of pork and poul-
             try by 30%, he said.                                   Challenges: It’s still early in the
                                                                    deployment of the products to know how
             “I have a bachelor’s degree in agronomy that           much they will affect fertilizer applications
             I finished in 1984, and we were talking about          and farm economics. Carbon markets are
             nitrogen-fixing corn back then. And it was a           still in development as well.



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