Abstract
Combined effect of temperature (30, 45 and 600 C) and organic matter (5, 7.5 and 10 g kg-I) was studied in laboratory on fixation of applied potassium (0, 50 and 100 mg kg-I soil) to Lyallpur, Sultan pur and Shahdra series. With the increase of applied potassium, its fixation was increased but with the increase of organic matter, it decreased while temperature showed inconsistent effect on potassium fixation. Maximum K fixation was noted with 100 mg K kg-I soil application rate, initial level of organic matter and at all temperature levels except in the Shahdra series where it was maximum at 30 0 C and decreased at higher temperatures. The minimum K fixation was noted at 0 level of K application rate, along with 10 g organic matter kg-· at all temperature levels except in the Shahdra series where it was minimum only at 60 0 C.
