| dc.description.abstract | Co-composting is a method for utilized organic waste for agriculture
sectors. C/N ratio and feedstock mixtures are mainly for successful on
composting process. Coffee husk has high C/N ratio 105.21. Insufficient C/N
ratio would be adjusted by accumulation extra material such as animal manure
and organic waste for easy nutrient from organic waste absorb into the soil
and plant. The present study was conducted in laboratory with aimed to
reducing C/N ratio by aerobic co-composting process and enhancing quality
of coffee husk, also assessment the quality of co-compost via measurement of
phytotoxicity by germination index. Two piles were conducted by mixing
coffee husk, chicken manure, and cow dung (Pile. 1) and coffee husk, chicken
manure, cow dung, and rice grain (Pile. 2). Samples were collected in 0, 7, 14,
21, 70, and 84 days for analyzed C/N ratio, while in every 7 days for measured
pH and EC (electrical conductivity). In addition, initial and in the end of cocomposting product was analyzed; NH4
+
, NO3-, total nitrogen, total
phosphorus, total cations (K, Ca, Mg), while for germination index was
analyzed after co-composting process. The results showed that (Pile. 2) the
greatest reduction in C/N ratio with 14.32 ± 0.2 and highest germination index
(GI) for Komatsuna (Brassica rapa var. Perviridis) with 131.5%. Thus, this
indicated higher value of total nitrogen which caused by added rice grain to
the co-composting pile. | en_US |
