| Summary: | Composting of organic waste including tofu wastewater, banana skins and
goat rumen as raw materials for production liquid organic fertilizer has been carried
out. The research consists of composting a single organic waste and as a mixture with
or without of molasses addition. In this study the effect of adding molasses and
composting time on the content of C, N, P and K in the liquid fertilizer produced
were also studied.
The results of this study indicate that the industrial tofu wastewater, banana
skins and goat rumen contain C, N, P, K and ratio C/N that are lower than the
standard requirements of organic fertilizer, so it can not be used directly as fertilizer,
but has potential as materials for liquid fertilizer. Composting tofu wastewater,
banana skins and goat rumen separately can reduce the content of C and N, but gives
same P and K content, and results in C / N = 1-5, so the mixture has not been
qualified as a fertilizer. Composting the mixture of tofu wasterwater, banana skins
and goat rumen gives a product with C / N = 12.6, which qualifies as organic
fertilizer. However, K content in the product is higher while the content of C, N, and
P are lower than required, so that the liquid composting results are not qualified as a
fertilizer. The addition of molasses on organic waste wether single and mixture can
increase the effectiveness of composting which is marked with a C/N ratio of 10-25
and the increase of C, N, P and K content, so it qualifies as a fertilizer. The
composting time longer than 21 days shows efective process that results in liquid
which has ratio C / N = 10-20 that qualifies as a fertilizer.
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