Summary:

Results of studies of natural-agricultural values of agricultural used mead-ows of Lasica canal of Kampinos National Park have been presented in the paper. Natural value was assessed on the base of floristic composition, site conditions, identified plants' communities and occurring valuable in natural regard plant and animal species. Agricultural value was assessed on the base of productivity and nutrition value of meadow phytocenosises calculated with Klapp botanical method (1974). Six floristic types was identified in analysed area: community with Alopecurus pratensis, Filipendula ulmaria/Valeriana officinalis, Ranunculus re-pens, Festuca rubra / Poa pratensis, Deschampsia ceaspiotsa, Anthoxantum odo-ratum, most of them were very simplified. Valorisation of Lasica canal meadow has proved that in agricultural respect their value was low, but in regard of site and species diversity preservation their natural value was high. In connection to actively protected birds occurring, preservation of actual meadow's natural values requires keeping of so far applied extensive agricultural management.