The Effect of Giving Gamal Leaf Bokashi (Gliricidia Sepium) on Various Depths of Mercury-Contaminated Soil and Its Accumulation in Plant Tissue

Rully Akbar Pribudi Djalalembah

doi:10.63922/ijeter.v4i02.3615

Rully Akbar Pribudi Djalalembah Universitas Tadulako

DOI: https://doi.org/10.63922/ijeter.v4i02.3615

Keywords: Organic Amendment; Gliricidia Sepium Bokashi; Mercury; Contaminated Soil; Plant Tissue; Maize; Soil Depth

Abstract

Mercury (Hg) contamination in soils affected by small-scale gold processing may reduce soil quality and create a pathway for heavy metal transfer into plant tissues. This study assessed the role of kirinyu bokashi (Chromolaena odorata L.) in regulating Hg distribution in contaminated soil and Hg accumulation in maize tissues across different soil depths. The greenhouse experiment was conducted at the Faculty of Agriculture, Tadulako University, using Hg-contaminated soil collected from the Poboya gold-processing area, Palu City. A factorial experiment in a randomized block design was applied with two factors: soil depth (0-10 cm, 11-20 cm, and 21-30 cm) and bokashi dosage (0, 15, 30, and 45 t ha-1). Each treatment combination was replicated three times, resulting in 36 experimental units. Observed variables included soil Hg, plant Hg, plant Hg uptake, soil pH, organic C, and cation exchange capacity. The results indicated that kirinyu bokashi altered Hg distribution in contaminated soil, reduced Hg concentration in plant tissues, and improved selected soil chemical properties, particularly organic C and cation exchange capacity. The 45 t ha-1 treatment showed the strongest tendency to suppress soil and plant Hg, although the magnitude varied among depths. These findings suggest that gliricidia sepium bokashi has potential as an organic amendment for managing Hg-contaminated soil.

References

Brady, N. C. (1990). The nature and properties of soils (10th ed.). Macmillan Publishing Company.
Buckman, HO, & Brady, NC (1982). Soil science. Bhratara Karya Aksara.
Darman, S. (1997). Soil fertility practicum guide. Laboratory of the Faculty of Agriculture, Tadulako University.
Darmono. (1995). Metals in the biological systems of living things. University of Indonesia Press.
Directorate General of Higher Education. (1991). Soil chemistry. Department of Education and Culture.
Ghosh, M., & Singh, S. P. (2005). A review on phytoremediation of heavy metal and utilization of its by product. Applied Ecology and Environmental Research, 3(2), 1-18.
Handayanto, E. (1994). Nitrogen mineralization from legume tree prunings of different qualities [Doctoral thesis, University of London].
Hardjowigeno, S. (1987). Soil science. PT Mediyatama Sarana Perkasa.
Hermanto, D., Dharmayani, NKT, Kurnianingsih, R., & Kamali, SR (2012). The influence of humic acid as a fertilizer supplement on maize plant to fertilizing efficiency in unirrigated land of Bayan District, North Lombok Regency, West Nusa Tenggara. Journal of Agricultural Sciences, 16(2).
Inoue, T., Yokuta, K., Elvince, & Kawakami, T. (2011). Mercury released from small-scale gold mining and its impact on the environment in Indonesia. Proceedings of Environmental Pollution and Degradation in Indonesia, 48.
Mirdat. (2013). Status of heavy metal mercury (Hg) in soil in agricultural areas of gold mining processing areas in Poboya Village [Thesis, Tadulako University].
Muniappan, R. (2002). History of Chromolaena odorata biological control programs. In C. Zachariades, R. Muniappan, & L. W. Strathie (Eds.), Proceedings of the fifth International Workshop on Biological Control and Management of Chromolaena odorata (pp. 134-136). ARC-PPRI.
Nur, IM (2015). Changes in mercury (Hg) in soil and plants due to the provision of Tithonia diversifolia compost and its distribution in the Poboya gold processing area, Palu City [Dissertation, Tadulako University].
Pena-Mendez, E.M., Havel, J., & Patocka, J. (2005). Humic substances: Compounds of still unknown structure, applications in agriculture, industry, environment, and biomedicine. Journal of Applied Biomedicine, 3, 13-24.
Pivetz, B. E. (2001). Phytoremediation of contaminated soil and ground water at hazardous waste sites. EPA Ground Water Issues.
Priyanto, B., & Prayitno, J. (2003). Phytoremediation as a pollution recovery technology, especially for heavy metals.
Rugh, C.L., Bizily, S.P., & Meagher, R.B. (2000). Phytoreduction of environmental mercury pollution. In I. Raskin & BD Ensley (Eds.), Phytoremediation of toxic metals: Using plants to clean up the environment. John Wiley & Sons.
Regards, AK, et al. (1998). The role of organic matter in suppressing the solubility of heavy metals in the soil.
Setiabudi, BT (2005). The spread of mercury due to gold mining in the Sangon area, Kulon Progo Regency, Yogyakarta. Kanisius.
Setijono, S. (1996). The essence of soil fertility. IKIP Malang.
Smith, D., Salt, D.E., & others. (1997). Phytoremediation of metals: Using plants to remove pollutants from the environment. Springer.
Soepardi, G. (1983). Soil properties and characteristics. Bogor Agricultural Institute.
Stevenson, F. J. (1994). Humus chemistry: Genesis, composition and reaction. John Wiley & Sons.
Sutedjo, MM (2002). Fertilizers and fertilization methods. Rineka Cipta.
Triastuti, Y. (2013). Phytoremediation of mercury (Hg2+) contaminated soil using vetiver zizanioides on the former Keputih landfill, Surabaya.
Vaughan, D., & Ord, B. G. (1991). Influence of natural and synthetic humic substances on the activity of urease. Journal of Soil Science, 42, 17-23.
Wahyudi, I. (2009). The benefits of organic materials in increasing phosphorus availability and reducing aluminum toxicity in Ultisols [Dissertation, Brawijaya University