The objective of this research was to study the physical and chemical properties of substrates with different mixtures of biosolids (BIO) and carbonized rice chaff (CAC) in order to get an appropriate medium for seedling development. The experiment was established in the nursery of the Department of Natural Resources/Forest Sciences, College of Agronomic Sciences, State University of São Paulo-FCA/UNESP-Botucatu (SP), using BIO from SABESP/Franca-SP and CAC in the following ratios (BIO/CAC): 100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, […]