Reducing Nitrogen Use Key To Human and Planetary Health, Study Says

Better management of nitrogen-rich fertilisers through alternating crops, optimising use and other measures can yield huge environmental and health benefits, but must boost food production at the same time, researchers warned Wednesday. From a report: Reducing nitrogen pollution from global croplands is a "grand challenge," the group of international researchers said in a study in Nature outlining a dozen urgently-needed reforms. The intensive use of chemical fertilisers helped fuel the four-fold expansion of the human population over the last century, and will be crucial for feeding 10 billion people by 2050. But the bumper crops of what was once called the Green Revolution have come at a terrible cost. Today, more than half the nitrogen in fertilisers seeps into the air and water, leading to deadly pollution, soil acidification, climate change, ozone depletion and biodiversity loss. "Given the multiple health, climate and environmental impacts of reactive nitrogen, it has to be reduced in all the mediums such as air and water," lead author Baojing Gu, a professor at Zhejiang University, told AFP. The benefits of doing so far outstrip the costs, he added. The world is naturally awash in nitrogen, which is critical for the survival of all life on Earth, especially plants. Nearly 80 percent of Earth's atmosphere is nitrogen, albeit in a gaseous form (N2) of little direct use to most organisms. It is made available to plants when microbes that live within plants or soils turn it into ammonia through biological nitrogen fixation. This process funnels some 200 million tonnes of nitrogen into the soil and oceans every year.

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