1. Laboratory of Soil Amelioration, Agrophysical Research Institute, St. Petersburg, Russia
2. Department of Soil Science and Agrochemistry, St. Petersburg State Agrarian University, St. Petersburg, Russia
3. Department of Mathematical Game Theory and Statistical Solutions, St. Petersburg State University, St. Petersburg, Russia
4. Department of Pedology, Soil Science Institute, Belgrade, Serbia
5. Mitscherlich Akademie Für Bodenfruchtbarkeit (MITAK), GmbH, Berlin, Germany