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Aluminum Detoxification by Humic Substance Extracted from Compost of Organic Wastes

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Author(s): Sugeng Winarso | Eko Handayanto | Abdullah Taufiq

Journal: Jurnal Tanah Tropika
ISSN 0852-257X

Volume: 15;
Issue: 1;
Start page: 19;
Date: 2010;
Original page

Keywords: Aluminum | chelate | compost | humic substance

ABSTRACT
Humic substance could control the activity of metal as well as exchangeable aluminum(Alexch) on acid soil. The humic substance extracted from compost of agricultural waste is rarely conducted. Theobjective of research was to evaluate the effect of humic substance concentration and sources to pH and Al suspension.The research had been conducted in the Soil Laboratory of Agricultural Faculty of Jember University from April toJuly 2009. The humic substance used in these researches was extracted from compost of rice straw (RS), soybeanstraw (SS), cassava starch solid waste (CSSW), and empty bunch of oil palm tree (EBOPT). The humic substanceconcentration treatments were 0, 10, 20, 30, 40, 50, 75, 100, 150, 200, 250, and 300 ppm. Result of the analysisshowed that characteristic of humic substance was difference depending on the source material used. The humicsubstance extracted from SS contains total base cations (K, Na, Ca, Mg) higher (1.17%) compared with CSSW (1.07%),OPT (0.87%), and RS (0.69%). While the humic substances extracted from RS contain total organic acid (Acetic,Fumeric, Cetoglutamic, Sucsinic, Propionic, Butiric, Ocsalic, and Citric Acid) higher (157 ppm) compared with EBOPT(129 ppm), SS (115%), and CSSW (108%). Among these organic acids, acetic acid was highest concentration (>34.51% of total acid). The addition of humic substance increased pH and decreased aluminum concentration of thesuspension. The higher pH increment and Al concentration reduction took place in the suspension treated with humicsubstance from SS compost. The correlation between decreasing Al concentration with humic substance concentrationwhich explained chelation was higher (r = 0.97) than decreasing Al concentration with increasing pH which explainedprecipitation (r = 0.93). Based on these research results, it can be concluded that humic substance extracted fromagricultural waste have a good prospect as a soil ameliorant to increase soil pH, detoxify soil aluminum, and increasesoil P availability on acid soil
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