POTENTIAL USE OF FLY ASH WASTES TO IMPROVE NUTRIENT LEVELS IN AGRICULTURAL SOILS; A MATERAIL FLOW ANALYSIS CASE STUDY FROM RIAU PROVINCE, INDONESIAHASAN BASRI JUMIN, SULHASWARDI AND AKING RAHMADAbstract Fly ash sewage of pulp and paper industry suitably processed and well managed may possibly be used as fertilizer for agricultural purposes. The objective of this study is to evaluate re-cycling possibility of fly ash waste to be applied as fertilizer for agricultural use. Fly ash sewage was applied to maize at 28 g/plant and could significantly increase the average dry weight of seed from 6.7 to 10.3 g/plant while net assimilation rates could increase from 14.5 to 35.4 mg.m-2 day-1. Therefore, production per hectare reached 3.2 ton/ha. The chemical analyses of fly ash waste indicated that there are no threshold content of dangerous metals with biological effects. Human tolerance to heavy metals such as mercury, arsenic, cadmium, chromium, cobalt, leads and molybdenum contents are also reported. This experiment indicated that fly ash sewage in suitable doses of 28 g/plant could be applied as substitution fertilizer for agricultural use and could eliminate environmental pollution.
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