The study on usage of K+ by two rice cultivars (Cv. Shaheen and KS-282) from KNO , KH PO and K SO (5 mM each), with 60 mM NaCl 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 KH2PO4 than KNO3 and K2SO4 application. The transport of Kwas the highest with KH2PO4 than KNO3 and K2SO4 application in Shaheen, whereas in var. KS-282 with K2SO4, transport of K was higher than the other two sources. The utilisation of K+ was higher with KNO than KH PO and K SO application in Shaheen, whereas in KS-282, K+ utilisation with KH PO 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.
