News / Africa

Feed the Soil, Feed the Crops

Using Evergreen Agriculture, Rhoda Mang’yana grows maize near Faidherbia trees to improve crop yields and soil fertility on her farm. (Credit: Jim Richardson)
Using Evergreen Agriculture, Rhoda Mang’yana grows maize near Faidherbia trees to improve crop yields and soil fertility on her farm. (Credit: Jim Richardson)

Multimedia

Audio
Joe DeCapua
If African farmers are going to feed the continent, they may first want to feed the soil. Studies show farmland is often depleted of vital nutrients. But researchers say a combination of organic farming methods may help.



Since the global food crisis several years ago, greater investment is being made in smallholder farms. Most of the farms in sub-Saharan Africa are smallholder, consisting of about one or two hectares. One of the goals is to boost yields without necessarily clearing more land to grow additional crops.

Washington State University researchers say that can happen with greater use of an agricultural system called perenniation. It mixes food crops with trees and perennial plants. Soil scientist John Reganold co-wrote an article about it in the journal Nature.

“This system that we call perenniation is one of those systems where you actually plant perennials and it increases both food security and it builds the soil at the same time,” he said.

There’s an old saying that you are what you eat. Plants need nourishment, too, and they get it from the soil.

He said, “One of the major problems is that the soils are fairly poor in most of the regions. And so how do you grow food on poor soils? There have to be food production systems that can build the soil and improve the yield.”

Reganold said that poor soil may have resulted from years of weathering that leaches many of the nutrients. But in some cases farmers may have done more harm than good.

“They have been actually using farming practices where they’re not putting in organic matter. They’re not putting in fertilizers. They can’t afford those things. And it just runs the soil down more. So they’re actually mining the soil. So they’re worsening the situation,” he said.

He said that the major nutrients that farmland needs are nitrogen, phosphorous and potassium.

“The big one,” he said, “is nitrogen. That’s the nutrient that the plant demands the most and that’s the fertilizer that’s mostly needed.”

He estimated that up to two billion dollars worth of nitrogen, phosphorous and potassium is lost from African soil each year.

That’s where perenniation comes in. It adds nutrients back into the soil.

“We came up with the term perenniation, but the systems have been around for a while. We use the term perenniation. It defines three systems that are already used in Africa. The oldest of the three is called evergreen agriculture and it’s where farmers actually plant trees with their crops. And they’ve been doing this to the best of my knowledge for 60 years, but it’s starting to gain ground,” he said.

It’s gaining widespread use in countries such as Niger, Burkina Faso, Malawi and Zambia, among others. The trees are planted among maize, millet or sorghum. They not only add nitrogen to the soil through their roots, but also through their leaves when they fall off and decay. At other times of the year the trees can shade plants from the harsh sun. Reganold said colonial English and French farmers believed crops should be separated from trees, not mixed together.

Besides planting trees, the perenniation also calls for the use of the doubled-up and the push-pull systems. The doubled-up system has farmers mixing pigeon pea plants among soybean and maize crops. Pigeon pea, a large shrub, adds nutrients to the soil, but can later be used for fuel and fodder. Some parts are edible.

The push-pull system also uses perennials, such as napier grass, which is grown around the maize, and desmodium, which is planted among the stalks. Reganold says desmodium 
is a natural pest management system. It pushes away the stem bore moth from the crops, while the napier grass pulls or lures the moth to the perimeter of the crops. Thus push / pull.

Reganold gave an example of one woman who had great success with perenniation.

“She’s a grandmother in her 50s. Her name is Rhoda Mang’yana and she started using this system about 20 years ago. She used actually two of the systems – the doubled-up legume and she also started using these evergreen agriculture trees. And her yields initially were about a ton of maize per hectare. Now with a good year she gets four tons per hectare. Four times what she was getting,” he said.

Reganold and his colleagues said millions of dollars should be invested in perenniation each year. He hopes development NGOs will take up the cause. Reganold co-wrote the Nature article with Jerry Glover of USAID and Cindy Cox of the International Food Policy Research Institute.

You May Like

Lebanese Media Unite to Support Palestinians in Gaza

Joint newscast billed as Arab world’s first unified news bulletin in support of Hamas-controlled Gaza Strip More

Photogallery Australian PM Alleges ‘Coverup’ at MH17 Crash Site

Meanwhile, Russia's ambassador to Malaysia denies plane's black boxes were opened before they were handed over to Malaysian officials More

Despite Advances in AIDS Treatment, Stigma Lingers

Leading immunologist tells VOA that stigma is often what prevents those infected with disease from seeking treatment More

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
IAEA: Iran Turns its Enriched Uranium Into Less Harmful Formi
X
July 22, 2014 10:26 AM
Iran has converted its stockpiles of enriched uranium into a less dangerous form that is more difficult to use for nuclear weapons, according to the United Nations’ Atomic Energy Agency. The move complies with an interim deal reached with Western powers on Iran's nuclear program last year, in exchange for easing of sanctions. Henry Ridgwell reports for VOA from London.
Video

Video IAEA: Iran Turns its Enriched Uranium Into Less Harmful Form

Iran has converted its stockpiles of enriched uranium into a less dangerous form that is more difficult to use for nuclear weapons, according to the United Nations’ Atomic Energy Agency. The move complies with an interim deal reached with Western powers on Iran's nuclear program last year, in exchange for easing of sanctions. Henry Ridgwell reports for VOA from London.
Video

Video Relic of Saint Draws Catholics Worried About Immigration Issue

A Roman Catholic saint who is a figure of devotion for those crossing the border into the United States is attracting believers concerned about the plight of undocumented immigrants. Mike O'Sullivan reports from Los Angeles, where a relic of Saint Toribio has drawn thousands to local churches.
Video

Video Ukraine Rebels Surrender MH17 Black Boxes

After days of negotiations, a senior separatist leader handed over two black boxes from an airliner downed over eastern Ukraine to Malaysian experts early Tuesday. While on Monday, the U.N. Security Council unanimously demanded that armed groups controlling the crash site allow safe and unrestricted access to the wreckage.
Video

Video In Cambodia, HIV Diagnosis Brings Deadly Shame

Although HIV/AIDS is now a treatable condition, a positive diagnosis is still a life altering experience. In Cambodia, people living with HIV are often disowned by friends, family and the community. This humiliation can be unbearable. We bring you one Cambodian woman’s struggle to overcome a life tragedy and her own HIV positive diagnosis.
Video

Video Nature of Space Exploration Enters New Age

Forty-five years ago this month, the first humans walked on the moon. It was during an era of the space race between the United States and the Soviet Union. World politics have changed since then and -- as Elizabeth Lee reports -- so has the nature of space exploration.
Video

Video Chicago’s Argonne Lab Developing Battery of the Future

In 2012, the U.S. Department of Energy’s Office of Science awarded a $120 million grant to a new technology center focused on battery development - headquartered at Argonne National Laboratory in suburban Chicago, Illinois. As VOA’s Kane Farabaugh reports, there scientists are making the next technological breakthroughs in energy storage.
Video

Video In NW Pakistan, Army Offensive Causes Massive Number of Displaced

Pakistan’s army offensive in North Waziristan has resulted in the large-scale displacement of the local population. VOA's Ayaz Gul reports from northwest Pakistan where authorities say around 80 percent of the estimated 1 million internally displaced persons [IDPs] have settled in Bannu district, while much of the remaining 20 percent are scattered in nearby cities.
Video

Video Kurdish Peshmerga Force Secures Kirkuk, Its Oil

The Kurdistan regional government has sent its Peshmerga troops into the adjacent province of Kirkuk to drive out insurgents, and to secure the area's rich oil fields. By doing this, the regional government has added a fourth province to the three it officially controls. The oil also provides revenue that could make an independent Kurdistan economically strong. VOA’s Jeffrey Young went out with the Peshmerga and filed this report.
Video

Video Malaysia Reeling: Second Air Disaster in Four Months

Malaysia is reeling from the second air disaster in four months involving the country’s flag carrier. Flight 340 vanished in March and despite an extensive search, no debris has been found. And on Thursday, Flight 17, likely hit by a surface-to-air missile, came apart over eastern Ukraine. The two incidents together have left more than 500 people dead. VOA Correspondent Steve Herman reports from Kuala Lumpur.

AppleAndroid