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Coffee Waste Sparks Forest Revival
29 Sep
Summary
- Coffee pulp rapidly killed pasture grass and decomposed.
- Soil nutrient levels significantly increased after coffee pulp application.
- Woody plant density grew over 20 times higher in treated areas.
In March 2018, researchers in southern Costa Rica conducted an experiment using coffee processing waste to restore a degraded pasture. Approximately 30 dump truck loads of coffee pulp were spread across a test plot.
Within three months, the pulp layer decomposed, killing the existing grasses. By March 2020, the treated plot showed significantly higher soil carbon and nitrogen levels, along with increased phosphorus and other nutrients.
This nutrient-rich environment fostered rapid woody plant growth. Woody stem density was over 20 times higher than in the untreated control plot after two years.
The experiment demonstrated that agricultural by-products like coffee pulp can enhance natural forest succession by altering soil conditions and suppressing competing grasses. An earlier experiment with orange peels in Costa Rica also showed positive impacts on woody vegetation regeneration.
However, researchers noted limitations including the logistics of moving waste and potential environmental risks. Further testing is needed to confirm the effectiveness and safety of this approach at larger scales.
