By Yvette Zongo
With her hoe in hand, her back bent from decades in the fields, Maan, meaning “grandmother” in the local Nuni language of Burkina Faso’s Centre-Ouest region, isn’t ready to put down her farming tools just yet.
On this July afternoon, as the sun blazes overhead, the septuagenarian works cheerfully alongside her 8-year-old grandson, weeding her plot near Cassou, a rural commune of some 54,000 inhabitants where she was born.
The 5-acre plot, which Maan Alima Tagnan inherited from her late husband, sustains her small family. For years, she has cultivated a mix of crops here.
What draws the eye, however, is the unusual layout: carefully spaced rows of young trees alternating with mature ones, thriving among cowpeas, millet and other crops now nearing harvest.
This is agroforestry polyculture using “fertilizer trees,” an ancestral technique that the Association for the Promotion of Fertilizer Trees, Agroforestry and Forestry (APAF) has revived and modernized by introducing new varieties of nitrogen-fixing trees.
“We haven’t invented anything. It is nothing new to plant trees in fields to enrich the soil,” Firmin Hien, deputy executive director of APAF-Burkina Faso, tells Mongabay. “Our parents used to do it too, but people abandoned the practice with the arrival of chemical fertilizers.”
His remarks are echoed by Cheick Zouré, a specialist in the rehabilitation of degraded ecosystems at Joseph Ki-Zerbo University in Burkina Faso. He says research shows these trees can improve soil quality by 30-60% by adding key nutrients, notably nitrogen nodules, potassium and phosphorus.
Maan Tagnan has planted several varieties of fertilizer trees in her field, including Albizia stipulata, Ferruginea and white acacia (Faidherbia albida). The acacia, known locally as zaanga, is revered by agroforesters, Zouré says. “It’s an off-season tree that sheds its leaves during the rainy season and provides shade in the dry season, making it essential for maintaining soil fertility in agroforestry systems,” he says.
When Maan Tagnan realized her land was no longer productive, she turned to chemical fertilizers. But the cost is prohibitive. “At my age, where will I get the money to buy such expensive fertilizer?” she asks.
Now, she says, her soil is slowly recovering as the trees she planted take root and grow.
According to Hien, Maan Tagnan and other women have received several training sessions on how to properly plant and care for fertilizer trees. They’ve mastered methods tested in recent years in the communes of Cassou and Bazoulé: trees spaced 10 meters (33 feet) apart and 5 m (16 ft) from rain-fed or market-garden crops; regular watering; periodic weeding; and pruning the tops of young plants once they reach 1-1.5 m (3-5 ft) in height.
Beneficiaries report that thanks to these techniques, they’ve restored several dozen hectares of land degraded by poor farming practices. The trees’ presence has also attracted bees and birds that had long disappeared from the area.
Adjara Diasso, president of Les Marolaines, the local association in Cassou of which Maan Tagnan is a member, says she’s also delighted. In her 40s, this mother and passionate farmer once struggled to make ends meet on her infertile land.
At one point, she says, she considered abandoning farming altogether to pursue another livelihood. When she first learned about fertilizer trees, she was unsure, but she has embraced the practice. “Today, everything is going wonderfully, as you can see,” she says.
In her field of millet intercropped with cowpea, sorghum and other staples, Diasso says she’s now spoiled for choice. Whatever she plants alongside the trees seems to thrive.
But all this progress has not come without challenges. For these women, the greatest obstacle in planting fertilizer trees is the availability of water.
“Right now, with rainfall no longer sufficient, it’s complicated,” Diasso says. “After the rainy season, trees that haven’t developed strong roots die if they aren’t watered — and we don’t have large-diameter boreholes to do the job.”
Across Burkina Faso, farmland has been steadily deteriorating. Recent statistics show that an average of 1.16 million acres of land is degraded every year.
Since the women of Cassou adopted this technique, the number of trees in cultivated fields has steadily increased, Firmin Hien says.
Beyond the “Land of Honest Men,” as Burkina Faso is known, many other African countries — notably Senegal and Togo have also adopted this soil-restoring practice, supported by APAF.
This story was first published by Mongabay: https://news.mongabay.com/2025/09/burkina-fasos-women-farmers-reviving-the-land-with-fertilizer-trees/
