Effectiveness of Phytomining of Vanadium (V) and Chromium (Cr) Using Cymbopogon citratus and Portulaca grandiflora in Red Mud with Manure AdditionIrwan Fitranto, Bieby Voijant Tangahu, Andriyan Yulikasari, Mashudi, Harmin Sulistyaning Titah, Moh. Najib Rizal, Faiza Salsabilla, Yeng Ming Lam, Yamin Wang, Hurun In and Mery Maryanawati SoesiloBIO Web Conf., 157 (2025) 03003DOI: https://doi.org/10.1051/bioconf/202515703003