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Study In Ethiopia Links Healthy Soils To More Nutritious Cereals




Frédéric Baudron, International Maize and Wheat Improvement Center (CIMMYT)

Large fields, predictable rainfall and favourable temperatures have meant that farmers in Arsi Negele, a town in southeastern Ethiopia, have benefited from good crop yields. Their production of wheat and maize, two of the main food staples in Ethiopia, have also increased over time.

But there are worrying indicators that the increased yield and calories haven’t translated into sufficient vitamins and minerals. This deficiency is known as “hidden hunger” and Ethiopia is classed as having “severe” levels.

Less than 20% of children in the area have a diet that’s diverse enough to meet their nutritional needs. This is much lower than the 40-70% typically found in other developing countries, like Tanzania. Protein and zinc deficiencies are of particular concern and contribute to a variety of health issues like stunted growth in early years and poor immunity.

One of the causes of this is that, because there’s a need to feed more people, global trends prioritise high yielding cereal species and varieties as the paper refers mainly to different species over lower-yielding – but more nutritious – crops and animal products.

While it’s known that soils can contribute to nutrients in crops, the studies are very few and mostly look at horticultural crops – like vegetables, fruits and flowers. Little has been done to quantify the links between soil organic matter – plant and animal residue – and crop nutrient content, particularly in cereals.

Our study is one of the first to reveal the link between soil organic matter and crop nutrient content for a staple crop in a developing country. We found that wheat grown around Arsi Negele had more nutrients, like zinc and protein, when grown on soils rich in organic matter.

Increasing organic matter by 1% was associated with an increase in zinc equivalent to meet the daily needs of 0.2 additional people per hectare and an increase in protein equivalent to meeting the daily needs of 0.1 additional people per hectare. These modest increases in soil organic matter contribute a small, but important, increase in nutrients found in wheat.

Although these nutrient increases are not enough to address hidden hunger on their own, they reveal how healthy soils are an additional tool – alongside diet diversity and the biofortification of food – for fighting malnutrition.

Nutrient levels

Twenty seven farms, of varying distances from the forest, were selected. We measured; soil organic matter content, wheat yield, and wheat nutrient composition.

We found that wheat grown in areas closer to the forest, which are especially high in organic matter (about 1% higher) due to decomposing trees and plants and enriched with manure of livestock grazed in the forest, had higher levels of nutrients – like zinc and protein.

This is good news for Ethiopia, where low-cost soil management approaches may be more accessible to farmers than expensive mineral fertilisers which I’ve found to cost about $30 USD per bag – about 4 bags are needed per hectare. As a result, less than 30kg of mineral nitrogen fertiliser are used per hectare of wheat in our study area – when it should be at least twice that amount.

Some of the techniques that improve soil organic matter include:

  • Planting trees on farms
  • Minimise plowing to conserve and support the accumulation of organic matter
  • Planting legume crops – like such as faba beans, haricot beans and field peas – which fix nitrogen from the air into the soil, thus increasing fertility.

Farmers in inland Africa are known to pay more than twice as much for fertiliser as farmers in Europe. These soil techniques are more accessible and have already led to successful outcomes in different African farming systems.

Growing malnutrition

The consequences of poor soils for wheat nutrition are significant, not only for people in Ethiopia, but around the world. The finding offers a new solution in addressing growing malnutrition.

It can help increase the nutritional content of food, which has decreased due to large-scale intensive farming systems. Wheat is one of the world’s main crops, with global production of over 749 million metric tons, but studies show that the amount of essential dietary nutrients in these crops have eroded over time. Ethiopia saw a decline in nutrients despite increased crop yields in part due to the Green Revolution – a global push to increase agricultural production.

Another major threat is climate change. A recent study found that crops grown in an atmosphere of increased carbon dioxide (CO2) contain lower levels of protein, zinc and iron, and estimated that “hundreds of millions of people” could become more nutrient deficient as the climate changes. By increasing the organic matter of soils we could grow food that adds a buffer to these reductions.

Way forward

More projects need to include actions that increase soil organic matter for the sake of improved nutrition.

While big climate change initiatives exist to protect and store carbon in soils, we must look at the bigger picture and consider how soils and forests contribute to improved nutrition as well. By planting more trees on farms, storing more carbon in soils, and improving crop-livestock interactions, we not only fight climate change but also wage a stronger battle against malnutrition.The Conversation

Frédéric Baudron, Systems Agronomist, International Maize and Wheat Improvement Center (CIMMYT)

This article is republished from The Conversation under a Creative Commons license. Read the original article.

African News

Miners Trapped Underground In Zimbabwe




The Zimbabwe Miners Federation has on Thursday said rescue operations are under way in northern Zimbabwe, where dozens of illegal miners are believed to be trapped underground after the collapse of an old mine shaft.

Wellington Takavarasha, head of the Zimbabwe Miners Federation said the incident occurred late Wednesday in the town of Bindura, around 70 kilometres (43 miles) north of the capital Harare.

At least 40 informal miners in Zimbabwe have been trapped underground after a shaft in a disused gold mine collapsed, six miners have since been pulled from the rubble and taken to hospital.

Takavarasha told AFP the miners were working inside the disused Ran Gold Mine when a shaft caved in.

Mining without the proper permits has been on the rise in the gold-rich country due to high levels of joblessness and the COVID-19 lockdown.

The southern African country is rich in minerals such as platinum, diamonds and gold. Small-scale miners account for over half of the gold produced in the country.

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African News

Two Million Fall Into Poverty In Kenya




A report by the World Bank says two million Kenyans fell below the poverty line between March and June this year.

Within the period, the rate of unemployment in east Africa’s largest economy increased from 5% to 21%.

This widened the number of people living below poverty line by 4% to two million. Poverty line is $1.90 per day

Factory workers and those working in tourism and agriculture are reported especially affected.

Kenya’s debt stands at 65.6% of the gross domestic product. The country’s tax revenues have reduced but debt servicing requirements have increased.

The national treasury is in the process of seeking another $2.3bn from the international monetary fund to help fund the response to the coronavirus pandemic.

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African News

Suspected Boko Haram Attack Kills Four Chadian Soldiers




Four soldiers have been reported killed in south-west Chad when a boat exploded. Dozens others were said to have been injured when an explosive device placed at the bottom of the boat exploded.  The device was thought to have been an improvised bomb.

The blast happened on Tuesday night near Ngouboua, around 25km from the Nigerian border.

A district administrator said authorities are trying to find out if this is a new technique of Boko Haram.

The Boko Haram insurgency began in north-eastern Nigeria more than a decade ago. The UN says violence has spread to neighbouring countries, killing more than 30,000 persons and forcing two million from their homes.

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