Bioavailability of Silica on Paddy Soils with Various Land Aging in Musi Rawas South Sumatera of IndonesiaJon. Bimasri, Dedi Budianta, Marsi and Umar HarunE3S Web Conf., 68 (2018) 01008DOI: https://doi.org/10.1051/e3sconf/20186801008