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Fertilizer Offers Potential Deer Management Solution

• By Bryce Ethridge •

deer damage

Pictured is an overhead view of a cotton field affected by deer in Burke County, Georgia. Deer can damage as much as 50 percent of a farmer’s crop. Burke County Extension agent Katie Burch may have found an effective deer deterrent in Milorganite fertilizer.

The threat of deer eating the cotton grown on local farms sent University of Georgia Cooperative Extension Agriculture and Natural Resources agent Katie Burch searching for a solution. With the help of UGA East Georgia agronomist Mark Freeman, the Burke County, Georgia, agent may have found one.

Although the potential solution needs further research for verification, Burch says she believes Milorganite, a fertilizer made from treated sewage collected in Milwaukee, Wisconsin, is an effective deterrent.

Milorganite was chosen because of its pungent smell and likely foul taste. Conducting her own research last year, Burch spread the fertilizer over cotton plots and then checked a week later to see if deer had been browsing them. From all visible signs, the Milorganite had deterred the deer.

“Visually and percentage-wise for the counts we took in the field, you can tell where the deer were deterred — where the Milorganite was spread — versus where they weren’t,” Burch says.

Significant Yield Loss

The fertilizer treatment was applied once a week for four weeks. As for the plots that weren’t treated with the fertilizer, deer continued to mow through the cotton.

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Burch started the project after she began working for UGA Extension in 2016, when deer caused major yield losses for a farmer in Burke County. Prior to testing Milorganite, Burch tried various chemicals and found none were an acceptable solution.

“This trial saw more success and the producer was happy about it,” she says. “This is something I think a lot of growers across the state can benefit from if we do find that it is successful long term.”

According to Burch, deer are known to damage at least 50 percent of farmers’ crops across Georgia. This represents a major profit loss for farmers.

Annually, a farmer will spend thousands of dollars to try to stave off wildlife pressure. Some of those alternatives include night hunting equipment and traps, which are costly and not completely effective.

“Not only do farmers have to spend additional money, but they have to work all day and stay up all night to protect their crop,” she says. “It’s very hard for a producer to budget every year for wildlife damage control.”

Cost Savings Is Key

Burch wants to make sure that the farmers of Burke County and across Georgia don’t have to deal with those high expenses much longer. If another year of research produces positive results, producers may be able to save on wildlife management.
Georgia cotton is typically planted in May and early June.

For more information about how to manage wildlife on your property, see the UGA Extension Wildlife Management Series at extension.uga.edu/publications.

Bryce Ethridge is a writer for the College of Agricultural & Environmental Sciences — University of Georgia Cooperative Extension.