Summary: The study analyses the spatial and temporal changes of drought in three counties of the southern part of the Great Hungarian Plain (Bács-Kiskun, Békés and Csongrád counties) as well as in Szolnok county, furthermore it investigates the relationship of the crop results of certain cultivated plants to the meteorological factors. In this study have been processed the time series of the 31 years for the period 1953–1983 at 14 stations, as well as the time series of the 24 years for the period 1960–1983 of the average yield of wheat, corn and sugar-beet in each county.

The water supply in the southern part of the Great Hungarian Plain – although it is spatially and temporally very changeable – has a negative balance in each year, in some years it is even accompanies with a semi-desert character. The changeable temporal course of precipitation strongly manifests itself in the stock of soil water; the greatest water saturation can be expected even in the summer half-year, but the poor soil humidity causing drought damage is more and more frequent from the middle of the summer season on.

It can be set down that the crop results of the above-mentioned cultivated plants considerably depend on natural factors even in spite of the rise of agrotechnics, consequently the irrigation and the extension of a reliable irrigation base in the southern part of the Great Hungarian Plain is by all mean desirable.

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