Keeping more ammonium in soil could decrease pollution, boost crops

May 26, 2021

Modern-day agriculture faces two major dilemmas: how to produce enough food to feed the growing human population and how to minimize environmental damage associated with intensive agriculture. Keeping more nitrogen in soil as ammonium may be one key way to address both challenges, according to a new paper in the Proceedings of the National Academy of Sciences (PNAS).

Today’s use of nitrogen fertilizers contributes heavily to greenhouse gas emissions, air pollution, and water pollution, but they are also essential for growing crops. Reducing this pollution is critical, but nitrogen use is likely to grow with increased food production. At the same time, the world’s human population is increasing, and agriculture needs to efficiently produce enough food to feed everyone without resorting to clearing more forests for agriculture.

In the past, farmers have managed to increase food production by adding more nitrogen fertilizers to their farm lands, but doing so is no longer a viable or acceptable solution. Instead, farmers should consider shifting to a blend of nitrate and ammonium, the researchers argue, which can decrease pollution and increase food production. Ammonium, a form of nitrogen, binds to soil and so is less likely to leach into waterways.

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