[en] The study on usage of K+ by two rice cultivars (Cv. Shaheen and KS-282) from KNO/sub 3/, KH/sub 2/PO/sub 4/ and K/sub 2/SO/sub 4/ (5 mM each), with 60 mM NaCI under hydroponics conditions, showed that fresh mass of shoot (FMS), fresh mass of root (FMR), root/ shoot ratio of fresh and dry mass, relative water contents (RWC) and relative growth rate (RGR) were affected significantly (P=0.01) inconsistent relating to K+ sources under salt stress. The intake of K+ was the highest with application of KH/sub 2/PO/sub 4/ than KNO) and K/sub 2/SO/sub 4/ application. The transport of K+ was the highest with KH/sub 2/PO. than KNO) and K/sub 2/SO/sub 4/ application in Shaheen, whereas in var. KS-282 with K/sub 2/SO/sub 4/. transport of K+ was higher than the other two sources. The utilisation of K+ was higher with KNO) than KH/sub 2/PO/sub 4/ and K/sub 2/SO/sub 4/ application in Shaheen, whereas in KS-282, K+ utilisation with KH/sub 2/PO/sub 4/. was higher than the other two sources. It was inferred that K+ consumption in shoot and root system of rice was dependent physio-genetically on potassium sources. (author)