Study: Farming crops with rocks to reduce CO2 and improve global food security

May 29, 2018 05:04 PM EDT | By Staff Reporter

Close
Farming crops with rocks to reduce CO2 and improve global food security
Farming crops with rocks to reduce CO2 and improve global food security

Farming crops with crushed rocks could help to improve global food security and reduce the amount of CO2 entering the atmosphere, a new study has found.

The pioneering research by scientists at the University of Sheffield together with international colleagues suggests that adding fast-reacting silicate rocks to croplands could capture CO2 and give increased protection from pests and diseases while restoring soil structure and fertility.

Professor David Beerling, Director of the Leverhulme Centre for Climate Change Mitigation at the University of Sheffield and lead author of the research, said: "Human societies have long known that volcanic plains are fertile, ideal places for growing crops without adverse human health effects, but until now there has been little consideration for how adding further rocks to soils might capture carbon.

"This study has transformed how we think about managing our croplands for climate, food and soil security. It helps move the debate forward for an under-researched strategy of CO2 removal from the atmosphere - enhanced rock weathering - and highlights supplementary benefits for food and soils.

"The magnitude of future climate change could be moderated by immediately reducing the amount of CO2 entering the atmosphere as a result of energy generation. Adopting strategies like this new research that actively remove CO2 from it can have a massive impact and be adapted very quickly."

The research, published today (19 February 2018) in Nature Plants, examined the approach which involves amending soils with abundant crushed silicate rocks, like basalt, left over from ancient volcanic eruptions. As these minute rock grains dissolve chemically in soils, they take up carbon dioxide and release plant-essential nutrients.

Critically, enhanced rock weathering works together with existing managed croplands. Unlike other carbon removal strategies being considered, it doesn't compete for land used to grow food or increase the demand for freshwater. Other benefits include reducing the usage of agricultural fertilizers and pesticides, lowering the cost of food production, increasing the profitability of farms and reducing the barriers to uptake by the agricultural sector.

Crushed silicate rocks could be applied to any soils, but arable land is the most obvious since it is worked and planted annually. It covers some 14 million square kilometres or 10 per cent of the global land area.

Arable farms already apply crushed rock in the form of limestone to reverse acidification of soils caused by farming practices, including the use of fertilizers. Managed crops, therefore, have the logistical infrastructure such as the road networks and machinery needed to undertake this approach at scale. These considerations could make it straight forward to adopt.

Professor Stephen Long at the University of Illinois Champaign-Urbana, and co-author of the study added: "Our proposal is that changing the type of rock, and increasing the application rate, would do the same job as applying crushed limestone but help capture CO2 from the atmosphere, storing it in soils and eventually the oceans.

"Global warming is a problem that affects everyone on the planet. Scientists generally have done a poor job of getting across the point that the world must reduce emissions of greenhouse gases from fossil fuels and combine this with strategies for extracting carbon dioxide from the atmosphere to avoid a climate catastrophe."

Professor James Hansen from the Earth Institute at Columbia University and co-author of the work, added: "Strategies for taking CO2 out of the atmosphere are now on the research agenda and we need realistic assessment of these strategies, what they might be able to deliver, and what the challenges are."

© 2018 Food World News. All rights reserved. Do not reproduce without permission.

SHARE YOUR THOUGHTS

Get the Most Popular Food Stories in a Weekly Newsletter
Food Biz
What to Consider When Camping through Wine Countries?

What to Consider When Camping through Wine Countries?

It's absolutely and insanely expensive, so never mind. You would probably think like this when somebody invited you to spend a weekend in a wine region. Perhaps you presume that wines are expensive, so as its origin, right? That makes sense. But you, my friend, should know that there is a way to enjoy and explore the valley on a dime.

Everything You Need to Know About Cardamom Pods

Everything You Need to Know About Cardamom Pods

Cardamom is a spice made from the seed pods of a tropical plant related to ginger and is one of the world's most expensive spices. It is local to India and Sri Lanka but is now also harvested in Cambodia, Guatemala, Indonesia, Mexico, and Vietnam.

Coming back from injury - When and How?

Coming Back From Injury - When and How?

Knee injuries - They're a hazard of any sport that involves significant lateral stresses and football has plenty of those. Whether you're changing direction at speed, taking hits or delivering them, then there's a good chance you're going to tweak something (and let's hope that it's just been a tweak!).

Food Tech
5 Edible Flowers with Surprising Health Benefits

5 Edible Flowers with Surprising Health Benefits

Flowers are typically used for ornamental purposes. We cherish their beautiful blossoms or hypnotic scents. But many flowers are also edible and offer surprising health benefits.

How Can You Reduce Your Exposure to Toxins?

How Can You Reduce Your Exposure to Toxins?

There are so many ways we can experience exposure to harmful poisons, and in many cases, we may not realize it's happening. From household cleaners and similar products to children's toys, there are often toxins and poisonous products and ingredients lurking in even the most unsuspecting of places.

Top 4 reasons why more and more athletes are turning vegan

Top 4 Reasons Why More and More Athletes are Turning Vegan

All pro level athletes know about the dedication needed to not just accomplish their goals, but to achieve even bigger targets in their lives. It's also a commonly known fact that fitness and exercise alone cannot get them there. Putting the right food into their bodies is equally important.

Real Time Analytics