Circular economy in action: palm oil kernel biochar and boiler ash enhance growth of Amaranthus viridis via ROS-induced antioxidants modulation - Jamilah Syafawati Yaacob; Muskan Sheba; Guan Cong Lee; Rosazlin Abdullah; Lili Syahani Rusli; Qazi Fariduddin; Laavanya Nyanasaigran; Nur Sa’adah Abdul Halim; Abdullah Abdul Rahman; Noor Sharina Mohd Rosli (Environmental Science and Pollution Research, 2026)