The potential of legume cover crops and soil microbes for gold mine tailings revegetation

Authors

  • Triyani Dewi Research Center for Horticultural and Estate Crops, National Research and Innovation Agency http://orcid.org/0000-0003-3273-8109
  • Sukarjo Sukarjo Research Center for Horticultural and Estate Crops, National Research and Innovation Agency
  • C O Handayani Research Center for Horticultural and Estate Crops, National Research and Innovation Agency
  • Reginawanti Hindersah Faculty of Agriculture, Universitas Padjadajaran
  • Edwen D Waas Research Center for Horticultural and Estate Crops, National Research and Innovation Agency
  • A M Kalay Faculty of Agriculture, Universitas Pattimura
  • Hidayatuz Zu’amah Research Center for Horticultural and Estate Crops, National Research and Innovation Agency

DOI:

https://doi.org/10.15243/jdmlm.2023.104.4593

Keywords:

bioremediation, legume cover crop, mercury, tailing

Abstract

Mercury (Hg) is commonly utilized in artisanal gold mining on Buru Island; the Hg-contaminated tailing possibly contaminates the agricultural land nearby. In general, tailings contain very low organic carbon and plant nutrients but are high in mercury and have extreme soil acidity. The objective of this study was to observe the growth of various legume cover crops (LCC) and the change of Hg in tailing inoculated with Azotobacter-Trichoderma. The field trial was conducted on Buru Island of Maluku by using a split-plot design with three replications. The main plot was LCC species, composed of Centrosema pubescens (CP), Mucuna sp. (MC), and Crotalaria sp. (CR); the subplots were microbial inoculants composed of two formulations of Azotobacter-Trochoderma inoculants. The results showed that the Mucuna sp. and consortia Azotobacter-Trichoderma (2:1) had the highest survival rate in the tailings and Hg uptake by 8.83 mg kg-1 per plant. Consortia Azotobacter-Trichoderma inoculant with the composition of 2:1 (v:v) was able to increase soil pH, total bacterial population, LCC biomass, and Hg uptake by LCC plants. The highest Hg removal effectivity was observed in the plot treated with Crotalaria sp. and in a plot with Azotobacter-Trichoderma (2:1), which was 34.0% and 33.6%, respectively.

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Submitted

07-12-2022

Accepted

25-03-2023

Published

01-07-2023

How to Cite

Dewi, T., Sukarjo, S., Handayani, C. O., Hindersah, R., Waas, E. D., Kalay, A. M., & Zu’amah, H. (2023). The potential of legume cover crops and soil microbes for gold mine tailings revegetation. Journal of Degraded and Mining Lands Management, 10(4), 4593–4600. https://doi.org/10.15243/jdmlm.2023.104.4593

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Section

Research Article