| Summary: | <p>Sludge is the solid residual material that usually has been composted aerobically for a short period<br />
and partially digested under heated in anaerobiccondition. Anumber of chemical analysesdone on sludge<br />
from P'TSIER (Surabaya Industrial Estate Rungkut) contained much organic matter and nutrients (N, P.<br />
K, Ca, Mg etc.) for plant growrh, however, revealed that the sludge contained subtantial amounts of<br />
various heavy metals. PT SIER itself produced 2-5 ton sludge per week, which it has managed 216<br />
industrial units. The industrial estate sludge in preliminary trials showed beneficial effects on the growth<br />
of food plants and flowering of omamentaI plants.<br />
This research was carried out in a glass house of the Facudy of Forestry GMU. Red-Yellow<br />
Podzolic soil (Ultisols) from HPH PT Segara Indochem, Sangkulirang, East Kalimantan Province was<br />
used as the medium, sludge from PT SIER as a treatment on G. arborea seedling with 5 doses i.e. 0, 5,<br />
10, 15,20,25 and 30 glkg soil. This research was conducted to evaluate the effect of the sludge on the<br />
growth (height, diameter. total of dry weight) and quality of seedlings (top-root ratio, sturdiness and<br />
seedling quality index). Completely randomized design was used in the experiment with 5 replications.<br />
The result of statistical analyses showed that the application of the sludge was highly significant at<br />
I% level at all measurenments. The use of sludge wasable to incease dry weight 12times compared with<br />
control (control =0.558 g
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