The radar data have been used for establishing the proper crop information system in Poland. The objective of the study is to find an efficient method of crop classification based on satellite microwave data and to find the relationship of different soil - vegetation parameters on backscatter. There is a large demand of microwave images as due to often cloud effect these satellite data are available during a certain growth season. Wielkopolska region located in western Poland was selected for the research works. This region, characterized by intensive agricultural practices and diversified agricultural pattern, was equipped with ground truth information, which enabled to make properly the whole classification process.