food talk

Millets aren’t just healthy, they could also hold the answer to food security challenges

Archaeologists say millets – largely used as birdseed in the West – are resilient crops and could help feed the world’s population.

Over half of the food consumed by the human race in terms of calories comes from just three species of grain – wheat, rice and maize – yet in biological terms all are highly unnatural. They’ve been bred, generation after generation, to have grains that are super-sized in relation to their stems. This is perfect for maximising crop yields and profits, but not so perfect if growing conditions change in a changing climate.

Professor Martin Jones, Head of Cambridge’s Department of Archaeology and Anthropology, is far more interested in a group of around 20 species of small-grained cereals that are generically termed millets. They look like wild grasses, don’t need much water, grow quickly and have a good nutritional balance. Yet, until recently, they have been largely overlooked by the Western world as a food source for humans, and are most commonly found in packets of birdseed.

Now Jones has brought attention to this ancient grain as a means of mitigating against the boom-bust nature of harvests. His work has contributed to a growing market in Asia for high-quality millet from Aohan, Inner Mongolia, and the cereal’s potential is attracting interest from big multinational companies.

All of this has come from Jones’ archaeological interest in ancient farming practices. Searching for evidence of millet in the Neolithic, he discovered two key species – broomcorn and foxtail millet – in the prehistoric crop record in Europe, despite both being botanically East Asian. By piecing together the archaeological evidence, it became clear that Asian millets were coming into Europe, and that wheat and barley from Europe were moving into Asia.

Genetic diversity

“This wasn’t a time when farming was transitioning from hunter-gathering to agriculture,” said Jones. “What we were seeing was a move from single-season, single-crop agriculture to multi-season, multi-crop agriculture.” Hundreds of years ago the Asian millets were being used in flexible and innovative ways, and became among the most geographically widespread crops in the world. By using crops from other regions, the farmers could add another growing season and significantly increase their yields.

Jones’ archaeological work took him to a new site in Aohan when evidence emerged of local millet cultivation in Neolithic times. There, his Chinese colleagues found carbonised particles of foxtail and broomcorn millet dating from 7,700 to 8,000 years ago, which proved to be the earliest record of their cultivation in the world.

But it was his conversations with local farmers that radically altered his perception of the grains. “When we first visited Aohan it could sometimes be hard to tell whether the millet was growing as a crop or as a weed,” he said. We asked the locals, and rather than tell us it was a stupid question – that it was irrelevant whether it was crop or weed – they politely answered a different one. They told us what it tasted like and when they last ate it. These people had lived through hard times, famines, so to survive they had developed more open ideas. I realised then that I’d come with concepts that seemed universal but just weren’t relevant to the lives of people in contemporary northern China.”

The development of their farming practices, like those of the ancient farmers, was driven by the need for resilient plants that could ripen to harvest in challenging years, to ensure food security for the population. “What archaeologists can’t reconstruct is how much the early farmers understood the significance of what they were doing,” said Jones, “but this – and what we’ve heard from today’s Aohan peasant farmers – is something we can learn from in addressing our current food challenges.”

“With harvests and growing conditions intimately linked, the changes in climate now happening across the world pose a real threat to food security in certain regions,” added Jones. “To get the unusually big grain size we see in wheat, rice and maize, a lot of the properties that give the plants inherent resilience have been sacrificed. Being geared towards producing heads of large grains is terrific if you can guarantee all the water, nutrients and sunlight they need. But the crops are much more prone to complete failure if something changes, like the amount of rainfall in a growing season. It’s like putting all your eggs in one basket.”

For farming systems where there’s no financial infrastructure providing subsidies and grants to help farmers control the growing conditions through irrigation, pesticides and other methods, inherent crop resilience can be vital to a successful harvest.

“Millets have an unparalleled genetic diversity both because of their long history of cultivation, and because they’ve been grown in so many regions of the world, including very harsh ones,” said Jones. “This means they’ve retained the wild traits that give them resilience to changes in growing conditions. They don’t need much water, they grow quickly, and they have a great nutritional balance.”

Fluffymuppet/Flickr [Licensed under CC BY 2.0]
Fluffymuppet/Flickr [Licensed under CC BY 2.0]

After his work demonstrated the importance of the Asian millets and their origins in northern China, the Food and Agriculture Organisation of the United Nations recognised the Aohan Dryland Farming System as a “Globally Important Agricultural Heritage Systems” site. Aohan millet is now badged as a high-quality product and sold in large quantities to the domestic Chinese market, where it is a staple food. This year, Jones was among those awarded a medal from the Aohan government, not only for raising the profile of Aohan millet but also for helping the farmers to turn around the fate of this once overlooked crop, with support from their local government.

“I’m delighted that the Aohan government found such a useful and practical connection to academic research,” said Jones. “For me, talking to the farmers and local people in Inner Mongolia has taught me that their knowledge about plants is enormous.”

Given the increasing number of extreme weather events, and a growing population demanding a more varied diet, the world is facing a potential crisis in terms of food security. Aid agencies in Africa are becoming more aware of the practice of growing millet alongside the central maize crop as a safeguard against total harvest failure and are supporting farmers in Africa to continue to do this. And UK producers are showing interest in millet as a raw ingredient in branded consumer foods to help people improve their health and wellbeing.

“A huge amount of research linked to food security has focused on the really major crops,” said Jones. “Millets have taught me that it’s worth shifting the focus. We may have a lot still to learn from our Neolithic predecessors.”

Research funded by the European Research Council, the Natural Environment Research Council, the Wellcome Trust and the Leverhulme Trust.

This article first appeared on University of Cambridge website.

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This article was produced by the Scroll marketing team on behalf of Amazon.in and not by the Scroll editorial team.