Using the RothC model, we predicted the effects of tillage, fertilizer systems, and crop residues on C sequestration in the arable layer of 0–20 cm in a long-term field experiment on leached chernozem. The dynamics of SOC were traced until 2100 in three organomineral fertilizer systems compared with absolute control for moldboard tillage (MT) and conservation tillage (CT). It was shown that upon reaching an equilibrium level with an annual input of 2.9 Mg C ha, soil organic carbon stocks could be 79–83 and 81–85 Mg C ha−1 for MT and CT, respectively. The system with maximum FYM rates and crop residues incorporation reaches an equilibrium level 8–16 years earlier than the other systems for MT and 16–24 years earlier for CT, which is associated with higher stocks of C in this system at the beginning of modeling and the different quality composition of SOC. With an annual input of 4.6 Mg C ha−1, the possibility of providing 4‰ and higher annual rate of SOC increase was confirmed only in the first 20 years after an increase in C input. The fertilizer system, as a component of the history of the site, can affect C dynamics at least 40 years with a high C input and more than 75 years with an average C input on agrochernozems.
I.T. Husniev (Wed,) studied this question.