Ebido, N. E.; Awaogu, C. E.; Akubue, J. C.; Ozongwu, O. V.; Unagwu, B. O.; Obalum, S. E.; Igwe, C. A. Application of Rice-Husk Biochar to Coarse-Textured Ultisols and the Effects on Soil Fertility Indicators at Different Amendment-to-Sampling Intervals. j Trop. Soils 2025, 30, 69-83.