Correction to: Assessing the potential of biochar aged by humic substances to enhance plant growth and soil biological activity - Tereza Hammerschmiedt; Jiri Holatko; Vaclav Pecina; Dalibor Huska; Oldrich Latal; Antonin Kintl; Maja Radziemska; Sadiq Muhammad; Zygmunt M. Gusiatin; Martina Kolackova; Muhammad Nasir; Tivadar Baltazar; et al. (Chemical and Biological Technologies in Agriculture, 2021)