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1 Journal of Water and Land Development

1 2024

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Evaluating the productivity of five forages for the phytoremediation of heavy metal-contaminated lan

Sajimin Sajimin, Subiksa I Gusti M., Krisnan Rantan, Fanindi Achmad, Hidayat Cecep, Tresia Gresy E., Harmini Harmini, Sutedi Endang, Pamungkas Fitra A., Herdiawan Iwan, Isbandi Isbandi, Zulchi Try, Purwantari Nurhayati D., Rahman Rahman, Kurniawan Widhi, Bain Ali, Malesi La, Napirah Astriana

Journal of Water and Land Development

2024

no. 63

158--167

Post-tin mining land holds promise for cultivating forage crops, with the potential to address Pb metal contamination through plant-based phytoremediation. However, the presence of heavy metals and depleted soil fertility resulting from tin mining activities may pose challenges to plant productivity and contribute to residual heavy metal accumulation. This study aims to assess the productivity and phytoremediation capacity of Pb by various grass species on reclaimed mining land. Using a randomised block design with three replications, the study was conducted over a four-year period in a post-mining area in Central Bangka Regency, Indonesia. Three grass species: Megathyrsus maximus (‘Riversdale’ and ‘Purple guinea’), Pennisetum purpureum (‘Taiwan’ and ‘Mott’), and Chrysopogon zizanioides were evaluated for forage production, quality, digestibility, and heavy metal content. It was shown that ‘Riversdale’ and ‘Purple guinea’ cultivars had relatively stable production for over four years, with the crude protein content of all grass types remaining relatively low (<6%), apart from ‘Mott’ cultivar, which had a crude protein content of 10%. The Pb concentration in the plants remained below the permitted limits for ruminants. In the post-tin mining site, ‘Riversdale’ and ‘Purple guinea’ cultivars showed potential for development. It is concluded that mined land can be replanted with forage crops for phytoremediation purposes. ‘Purple guinea’ and ‘Riversdale’ cultivars emerge as potential livestock feed sources on ex-mining land due to their four-year productive stability and low lead (Pb) concentration in their shoots, which falls below the safe threshold for cattle.