Suitability of a solar collector constructed in a barn for drying hay with R-1000 ventilators was investigated in 1991-1993. Differences in the temperature of heated and unheated air were, depending on the weather, from 1 to 5℃, and air humidity from 1 to 10 percentage units in favour of the collector. Hay drying with heated air was faster by 14-40% than hay drying with ambient air. No significant differences were found in the quality and nutritive value of the hay dried with heated and unheated air. The use of a solar collector saved 14.3-24.4% energy needed to propel the ventilators.%Badano przydatność kolektora słonecznego do dosuszania siana w stodole. Uzyskano od 1 do 5℃ wyższą temperaturę i od 1 do 10 jednostek procentowych niższą wilgotność powietrza suszącego. Siano dosuszane za pomocą kolektora wysychało szybciej, dzięki czemu zaoszczędzono od 14,3 do 24,4% energii potrzebnej do napędu wentylatorów.
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