This is the 7856th most frequent Polish word.
mielecka
"Mielecka" refers to something related to the town of Mielec in Poland.
Here, 'Mielecka' functions as an adjective describing the team, referring to its origin or association with Mielec.
Mielecka drużyna wygrała mecz.
The Mielec team won the match.
In this context, 'mielckich' modifies 'polach,' indicating the location associated with Mielec, while being in the plural locative case.
Na mielckich polach rośnie dużo pszenicy.
A lot of wheat grows on the fields in Mielec.
'Mielecką' is used here as an adjective describing 'pisarkę,' adapted to its case and gender, relating the person directly to Mielec.