We have a legend about Vladimír Ptáček, who is an expert on solitary bees and bumblebees, but he also produced and tested in practice a practical breeding ground for solitary bees pollinating alfalfa in the former Czechoslovakia and now in the Czech Republic.
Unfortunately, the seeds of alfalfa cultivation have disappeared after globalization and the Czech Republic's accession to the EU.
https://www.sci.muni.cz/ptacek/
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