Biochar and clinoptilolite zeolite on selected chemical properties of soil cultivated with maize (Zea mays L.). - Siti Wardah Zaidun; Mohamadu Boyie Jalloh; Awang, Azwan; Lum Mok Sam; Normah Awang Besar; Musta, Baba; Osumanu Haruna Ahmed; Omar, Latifah (Eurasian Journal of Soil Science, 2019)