The study assesses potential food resources and cover for Grey partridges reintroduced in extensive agriculture conditions in central Poland. Research material consisted of data from 315 1 m2 study plots located in seven types of land use. Significant dynamics of food resources and cover with regard to season and land use form was found. Small crop areas or lack of intensive agrotechnical treatments do not create favourable conditions for partridges occurrence. Cereal fields may be used by the birds only in autumn−winter time. Meadows and barrens are sufficient environment but only by the time they lose their structure because of vegetation development. Stubbles offer the greatest variability of food, but are not stable part of the landscape and soon after the harvest time partridges leave them.
A method estimating the spring density of Grey Partridge using male call counts was tested. Vocal activity was found to be relatively constant between mid March and mid April. In this period, the average number of males heard at randomly- selected points in an area was strongly correlated with Partridge population density. Counts of calling males may be used to determine the spring density of Partridges: indiv./km² = 3.38x¹‧¹¹ or pairs/km² = 1.45.x¹‧¹⁶, where x = mean number of males heard at selected points. The number of randomly-selected single listening points (between 1 point per km² and 1 point per 10 km²) should be chosen in accordance with the size of the area and the aim of determining the density.