During 1967-68 experiments to determine the comparative effect of various nitrogenous fertilizers on soil reaction and soil aggregation of the Fox sandy loam, the Lincoln loam and the Lincoln clay loam were carried out in the pedology Laboratory of the Department of Geography, McMaster University. The soil samples were taken from the Horticultural Experiment Station, Simcoe, Ontario. A review of literature is presented in Chapter II. Chapter III discusses experimental techniques, results and a discussion of problems encountered. Chapter IV summarizes the results of the survey and analyses. / Thesis / Master of Arts (MA)