Biochar impacts on carbon dioxide, methane emission, and cadmium accumulation in rice from Cd-contaminated soils; A meta-analysis oleh Muhammad Athar Khaliq, Ibtisam Mohammed Alsudays, Haifa Abdulaziz Sakit Alhaithloul, Muhammad Rizwan, Jean Wan Hong Yong, Shafeeq Ur Rahman, Muhammad Sagir, Safdar Bashir, Habib Ali, Zuo Hongchao