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In just two years, the region treated with a thick layer of coffee pulp transformed into a small forest. Pixabay

Coffee pulp, a waste product of coffee production, could be used to speed up tropical forest recovery on post-agricultural land, suggests a new study.

In the study published in the journal ‘Ecological Solutions and Evidence’, the team spread 30 dump truck loads of coffee pulp on a 35-40m area of degraded land and marked out a similar-sized area without coffee pulp as a control.

“The results were dramatic”, said lead researcher Rebecca Cole from the University of Hawai’i in the US.

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“The area treated with a thick layer of coffee pulp turned into a small forest in only two years while the control plot remained dominated by non-native pasture grasses,” Cole added.

As compared to the control, nutrients such as carbon, nitrogen, and phosphorus were significantly higher in the coffee pulp treated area. Pixabay

After only two years, the coffee pulp treated area had 80 percent canopy cover compared to 20 percent in the control area. The canopy in the coffee pulp area was also four times taller than that of the control area.

The addition of the half-meter thick layer of coffee pulp eliminated the invasive pasture grasses which dominated the land.

These grasses are often a barrier to forest succession and their removal allowed native and pioneer tree species, that arrived as seeds through wind and animal dispersal, to recolonize the area quickly.

The researchers also found that after two years, nutrients, including carbon, nitrogen, and phosphorous, were significantly elevated in the coffee pulp treated area compared to the control.

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For the study, the researchers analyzed soil samples for nutrients immediately prior to the application of the coffee pulp and again two years later.

They also recorded the species present, the size of woody stems, percentage of forest ground cover and used drones to record canopy cover. (IANS/KB)



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