The aim of the study was to determine the effect of drip irrigation on yields of summer squash cv. ‘Danka' grown under conditions of the two localities: Lipnik near Stargard Szczeciński (soil of quality class IVB, and of good-rye-soil-complex) and Kruszyn Krajeński near Bydgoszcz (soil of quality class V, and of weak-rye-soil-complex). The experiments were designer as one-factorial trias. One factor was considered - drip irrigation (control, drip irrigation). Drip irrigation was conducted according to soil tensiometer indications (-0,04 MPa). Drip irrigation - both in Lipnik as well as in Kruszyn Krajeński - significantly increased marketable yields of summer squash ‘Danka'. Higher increases in yields due to irrigation were obtained in Kruszyn Krajeński. Mean marketable yield of summer squash fruits in Lipnik was higher than that obtained in Kruszyn Krajeński. Fruits in Lipnik were characterized by the higher weight as compared to those in Kruszyn Krajeński. Summer squash plants in KruszynKrajeński - irrespective of expe-rimental water treatment - were characterized by the higher number of fruits.