0.04%, 0.18%, 2.08% and 0.45% of P, K, Ca and Mg,
respectively. Such high nutrient values present in the leaf
tissues influence the nutrient contents of produced organic
fertilizer, including compost (solid organic fertilizer). The
magnitude of compost nutrients is also determined by the
mode of the biomass application during the composting
process. According to  gradual application of green
biomass, Tithonia diversifolia (Hemsl.) A. Gray and
Leucaena leucocephala (Lamk.), during composting of crop
residue produced a better quality of compost which
eventually improves crop growth and development.
Results from this experiment (Figs. 1-9) provide worth
information for developing liquid organic fertilizer that
suitable for closed agriculture production systems in the
highland of Bengkulu. It was clear that none of six green
biomasses tested in this experiment provided complete high
nutrient content. Each biomass has superiority over other
biomasses in particular nutrient. It is therefore suggested
that the use of green biomass for production of liquid
organic fertilizer could not rely on single biomass. The
source of green biomass should be a combination of several
green biomasses in order to produce liquid organic fertilizer
with high N, P, K, Ca, and Mg content. In addition, it also
important to mixture the green biomasses with other natural
composting material, such as poor soil , wood ash ,
cow manure , , ,  in order to increase
composting rates, nutrient quality and crop yields. The use
of a single green biomass for liquid organic fertilizer might
provide high particular nutrient content, but low in other
nutrients. This was confirmed by our previous result ,
,  where tithonia-enriched liquid organic fertilizer
contained 3,36% N, 146 ppm P, and 0.033% K. Although
nitrogen content of this liquid organic fertilizer somehow
comply with the standard quality for organic fertilizer issued
by Indonesian Standardization Board (SNI 19-7030-2004)
where total N should be > 0.4 %, but P and K content were
very much lower than standard (SNI-19-7030-2004) which
must be above 0.10% (P2O5) and 0.20% (K2O), respectively.
This experiment concluded that there was no single green
biomass that has all high-nutrient contents. However, A.
conyzoides is the most promising green biomass for
production of liquid organic fertilizer compared to others,
followed by T. diversifolia and G. sepium. Both T.
diversifolia and A. conyzoides are promising sources for N
and P. Sources of K are A. conyzoides and G. Sepium. In
addition, L. Leucocephala and A. conyzoides are sources of
Ca and Mg nutrients. The highest C content was found in
E.crassipes, followed by G. Sepium. T. diversifolia had the
highest cellulose content, followed by E.crassipes. Lignin
content of all biomasses was similar, ranged from 5.96% to
7.45%. Lastly, C/N ratios of all studied green biomass were
less than 16 (ranged from 5.49 to 15.12). To produce liquid
organic fertilizer with high N, P, K, Ca and Mg content,
several green biomasses should be properly combined.
Sincerely thank Ministry of Research, Technology and
Higher Education, Indonesia for financing this project
through 2016 Fundamental Research Scheme.
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