Effects of bio-slurry and chemical fertilizer on soil fertility and productivity of bread wheat (Triticum aestivum L.) in Northwestern Ethiopia.
Amare ZM, Assefa F, Alem T, Kassa Y, Andualem H
Soil Health
If you've ever composted kitchen scraps or kept a worm bin, you're already practicing the same logic Ethiopian farmers are now proving at field scale — organic waste recycled back into soil outperforms synthetic fertilizer alone.
Researchers in Ethiopia tested whether the liquid waste from biogas cookers — essentially digested organic slurry — could replace most of the expensive chemical fertilizers that wheat farmers rely on. They found that using mostly bio-slurry with just a quarter of the usual chemical fertilizer grew more wheat than full chemical fertilizer, and left the soil far richer in carbon and nutrients afterward. Importantly, no harmful heavy metals showed up in the grain, so the food was safe to eat.
Key Findings
The 25% chemical fertilizer + 75% bio-slurry treatment produced the highest grain yield (2.8–4.4 t/ha), a 40–60% increase over chemical fertilizer alone.
Soil organic carbon jumped from 1.8% to 15.8% and organic matter from 3.2% to 27.5% under bio-slurry-amended plots after harvest.
Heavy metals (lead, cadmium, chromium) in both soil and wheat grain remained below detection limits, confirming food safety of the integrated approach.
chevron_right Technical Summary
Mixing biogas waste (bio-slurry) with a small amount of chemical fertilizer boosts wheat yields by 40–60% compared to chemical fertilizer alone, while dramatically improving soil health and cutting farmers' fertilizer costs by 75%.
Abstract Preview
Declining soil fertility and rising mineral fertilizer costs severely constrain wheat production in Ethiopia, threatening food security. Bio-slurry from biogas digesters offers a potential low-cost...
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Common wheat, also known as bread wheat, is a cultivated wheat species. About 95% of wheat produced worldwide is this species; it is the most widely grown of all crops and the cereal with the highest monetary yield.