Open AccessPotential of mineral resources as an alternative raw material for K fertilizer
Author(s) -
Wiwik Hartatik,
Heri Budi Wibowo,
Markus Anda
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/393/1/012085
Subject(s) - leucite , fertilizer , andesite , trachyte , compost , beneficiation , mineralogy , mineral , chemistry , geology , geochemistry , agronomy , volcanic rock , ceramic , organic chemistry , volcano , biology
Indonesia has potential mineral deposits of leucite, phlogopite, biotite, and trachyte which could be explored as an alternative raw material for K fertilizer. The objective of the study was to evaluate K content of various rocks that were potential to be used as an alternative source of K fertilizer. The study of K nutrient solubility from finely ground eight rock types was done using incubation experiment under laboratory conditions. Treatments included control, heating, alkali fussion, heating followed by humic substance addition, heating followed by manure compost, humic and compost without heating. After incubation for 6 months, solubility of potential K (25% HCl extract) and available K (2% citric acid extract) were determined. The results showed that K 2 O content of various rocks varied from 1.26 to 8.10% with the highest value of 8.10% shown by leucite-bearing rocks of Situbondo followed by 7.06% for leucite Pati, 6.50% for andesite Jepara, 5% for trachyte-andesite Barru, 4.58% for granite Sijunjung, 3.59% for andesite Lebak, 2.73% for liparite Gayo Luwes and 1.26% for schist and dolomite Sanggau. Alkali fusion treatment of leucite Situbondo and Pati increased K availability by 81 and 49%, respectively compared to a control at first month incubation. Humic substances and manure compost treatment did not have significant differences on potential and available K. The implication of the study is only two rocks (Situbondo and Pati) out of eight rocks are promising and potential to be used as an alternative source of K fertilizer.