20201013105900.0 2081-6960 Scientific Journal Warsaw University of Life Sciences-SGGW. 2081-6960 2081-6960 Poland Scientific Journal Warsaw University of Life Sciences-SGGW. Problems of World Agriculture Scientific Journal Warsaw University of Life Sciences-SGGW. 2081-6960 2081-6960 Scientific Journal Warsaw University of Life Sciences-SGGW. Problems of World Agriculture