Summary:

The aim of this study was to assess the significance of changes of selected climatic indices for irrigation needs of plants in the years 1981- 2010 in the re-gion of Bydgoszcz, located in the zone with the highest desirability of the invest-ment location in terms of irrigation climatic criteria in Poland. The paper uses re-sults of meteorological measurements, carried out in the standard way, in the Research Station of the Faculty of Agriculture and Biotechnology 'Mochełek', University of Technology and Life Sciences, located approximately 20 km from Bydgoszcz.
The study involved 30-year normal period of 1981-2010. A number of me-teorological elements and indicators of meteorological and agricultural drought were taken into account. The calculations were made for the period from 1 May to 30 June. The study results showed no significant trends of change climatic indices for irrigation needs of plants in the Bydgoszcz region over the years 1981 - 2010. In the period 1996-2010 compared to the previous 15 years (1981-1995) it has been stated a while broadening the time variability of precipitation and evapotranspiration, and also of the climatic indices for irrigation needs of plants, calculated on the basis of them.