A survey by the Universities of Zurich and Hawaii used coffee grounds to revitalize forests, in an unprecedented study, published in the United Kingdom. And the result was impressive.
Scientists worked on deforested land in the 1950s to make way for agriculture in Costa Rica. They sprayed tons of coffee grounds in that area, 40 to 30 meters away, which would be discarded.
The results were compared with a neighboring area of the same size and in the same territory. In the area treated with coffee, 80% of the land was covered with trees, against 20% of the other land.
More than that: the trees born the coffee pulp were 4 times larger than those the untreated soil.
With this, the researchers proved the benefits of coffee residues as a natural fertilizer and their ability to recover deforested and degraded areas.
“The results were unexpected and extraordinary. The area treated with a thick layer of coffee pulp turned into a dense forest of trees in two years, while in the other area, that of the sample, nothing but grass and weeds grew ”, explained Professor Rebecca Cole, head of the study .
Coffee residues not only contain many micronutrients that fertilize the soil and promote rapid growth, such as phosphorus and nitrogen.
That is why it is a very powerful natural fertilizer, but it also has the secondary benefit of creating a barrier in the soil that blocks the growth of herbs and weeds, removing sunlight.
The extract stimulates growth and facilitates rapid repopulation of native species.
“This study clearly suggests that agricultural products can be reused to accelerate the recovery of forests in degraded tropical lands. It's a win-win situation, ”concluded Cole.