1. School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, USA
2. Center for Advanced Land Management and Information Technologies, University of Nebraska-Lincoln, Lincoln, NE, USA
3. Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, USA
4. Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
5. Institute of Natural Sciences, Derzhavin Tambov State University, Tambov, Russia