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Farmers in Africa say their soil is dying and chemical fertilizers are in part to blame (apnews.com)

submitted 3 months ago by [email protected] to c/[email protected]

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When Benson Wanjala started farming in his western Kenya village two and a half decades ago, his 10-acre farm could produce a bountiful harvest of 200 bags of maize. That has dwindled to 30. He says his once fertile soil has become a nearly lifeless field that no longer earns him a living.

Like many other farmers, he blames acidifying fertilizers pushed in Kenya and other African countries in recent years. He said he started using the fertilizers to boost his yield and it worked — until it didn’t. Kenya’s government first introduced a fertilizer subsidy in 2008, making chemical fertilizers more accessible for smaller-scale farmers.

Problems with soil health are growing as the African continent struggles to feed itself. Africa has 65% of the world’s remaining uncultivated arable land but has spent about $60 billion annually to import food, according to the African Development Bank. The spending is estimated to jump to $110 billion by 2025 due to increased demand and changing consumption habits.

“Inorganic fertilizers were never meant to be the foundation of crop production,” he said, later adding that because of “commercially inclined farming, our soils are now poor, acidic, and low in biomass resources, and without life!”

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[–] [email protected] 3 points 3 months ago* (last edited 3 months ago) (1 children)

They fucked something up, even if it's not that. You'll notice the soils of the US midwest are good as gold after a near-century of this shit.

That's not really their fault, though. Presumably nobody came and explained the best practices.

[–] [email protected] 11 points 3 months ago (1 children)

No the soils in the Midwest are not good.

https://storymaps.arcgis.com/stories/7e1766e613384ea59aef9ff17ccbdc9c

https://www.sciencedirect.com/science/article/abs/pii/S0341816224002716?via%3Dihub

Erosion and soil profile degradation from poor farming practices are a huge issue.

[–] [email protected] 3 points 3 months ago* (last edited 3 months ago)

If you want to get "out into the weeds", yes there's still problems. Water usage is insanely unsustainable in some areas too, which is the real emergency. Until the water table dries up yields are continue to be great.

Looking at the first paper:

Results show that topsoil has declined by a rate of 2 mm per year over the past 150 years

So that's the timescale we're talking. The Kenyan policy started in 2008, so 2mm/year topsoil loss isn't the issue. I also wonder how this figure changed around the dustbowl period, when practices were much worse yet.

To prevent the future impacts of this unsustainable erosion, farmers can implement no-till practices such as using disc seeders or agricultural drills. Along with this, soil regenerative practices may be necessary to reduce erosion rates (Thaler, Kwang, Quirk, Quarrier, & Larsen, 2022). Many of these practices are already common and are currently used by 51 percent of soybean, cotton, corn, and wheat farmers in the United States (Gamillo, 2022). Despite this, there are political, social, and economic barriers to this issue (Thaler, Kwang, Quirk, Quarrier, & Larsen, 2022). Providing incentives around no-till farming is essential for reducing soil erosion. No-till farming is necessary for soil productivity, ecosystem services, and long-term sustainability (Thaler, Kwang, Quirk, Quarrier, & Larsen, 2022).

Fun fact, no-till uses even more chemicals. If you're not mechanically digging up weeds and pests you've got to kill them other ways.