Biochar-assisted restoration of saline–sodic farmlands in the Eastern Province Al-Ahsa, Saudi ArabiaMohammed Al-Qahtani, Akmal Rakhmatullayev, Zaringisu Boltayeva, Dilrabo Khalimova, Mahfuza Umarova, Elyor Oltiyev and Shuxrat TeshayevE3S Web Conf., 670 (2025) 01002DOI: https://doi.org/10.1051/e3sconf/202567001002