Abstract
Coffee is one of the most valuable primary products in the world trade, and also a central and popular part of our culture and the crop is cultivated in about 80 countries across the globe and entangles huge business worldwide. Industrial coffee production involves either a dry or a wet processing method for the removal of the shell and mucilaginous parts from the cherries resulting in the production of coffee husk and pulp, respectively. These main by-products generated by the coffee processing plants and are disposed into arable land and surface water causing environmental pollution due to presence of toxic materials such as caffeine and tannins. To contribute to safe disposal of solid biomass waste in coffee processing many research was conducted to assess the opportunities and challenges of expanded use of solid waste from coffee processing in energy and agricultural services in across coffee producing countries. Therefore the objective of this review was to summarize the literatures and the current knowledge on the utilization of coffee husk and pulp waste for soil amendment, for sustainable agricultural systems within small-scale farming in developing countries like Ethiopia, using these easily available materials as good option for developing plant-nutrient management strategies in highly weathered soil area. Keywords: Coffee husk and pulp, coffee processing, soil amendment, waste management DOI: 10.7176/JNSR/12-11-02 Publication date: June 30 th 2021
Highlights
Coffee is one of the popular beverages of the world and second largest traded commodity after petroleum (Patricia, 2011)
Culture of utilizing coffee processing by-products for soil amendments and fertility improvement is not well established in the country as a whole
Various activities have been accomplished at Jimma Agricultural Research Center and across the country to assess ways of improving soil fertility through cheap and available organic materials in the coffee producing areas of Ethiopia
Summary
Coffee is one of the popular beverages of the world and second largest traded commodity after petroleum (Patricia, 2011). Composting is one of the integrated waste management strategies used for the recycling of organic materials into a useful product because of its eco-compatibility and easy operational procedures (Chane, 1999; Pandey and Soccol, 2000; Endale, 2016). the use of organic compost in agriculture is a practice that brings many advantages, avoiding environmental contamination and nutrients immobilization, besides being a source of organic matter in soil. There is always a direct and continuous release of these two important agricultural wastes (coffee husks and flower residues) to the environment This practice, resulted in environmental pollution besides the loss of valuable plant nutrients (Tenaw et al, 2006). Key: 1=90% Coffee pulp/husk + 10% Top soil; 2=80% Coffee pulp/husk + 10 Farm yard manure + 10% Top soil; 3=70% Coffee pulp/husk + 20 Farm yard manure + 10% Top soil; 4=80% Coffee pulp/husk + 10 leguminous materials + 10% Top soil; 5=70% Coffee pulp/husk +20 leguminous materials + 10% Top soil; 6=70% Coffee pulp/husk + 10 Farm yard manure + 10 leguminous materials + 10% Top soil
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