Effectiveness of various doses of silica nanoparticles from Dayang Rindu rice husk on phosphorus availability in ultisol soilSamsul Bahri, Suntoro Suntoro, Jauhari Syamsiyah and Edi PurwantoBIO Web Conf., 186 (2025) 01022DOI: https://doi.org/10.1051/bioconf/202518601022