Organic manure from coffee husks
An experiment was conducted to study the effect of 4 composting techniques on the recovery and nutritive quality of organic manure prepared from 3 different plantation wastes: coir pith, areca waste and coffee husk. The temperature during the experiment was 21.3-31.1°C. The following composting techniques were investigated: anaerobic, aerobic, microbial (Pleurotus sajor-caju addition), and a chemical process (urea + rock phosphate addition). Recovery percentage was highest in the case of coffee husk followed by areca waste and coir pith. The highest recovery percentage was recorded with the chemical technique followed by the anaerobic, aerobic and microbial techniques. The C/N ratio was least in areca waste (7.82) and with the aerobic method (8.73). The mineral content (N, P, K, Ca and Mg) of final compost was higher than that of the base material. Composting reduced the pith/fibre ratio of coir pith to 3.3 from the initial value of 7.3. The microbial load was higher in the areca and coffee husk composts than their base materials. The cost of preparation of organic manure was lowest for chemical treatment, followed by anaerobic composting.
Journal of Plantation Crops (India), v. 26(2) p. 120-126