Kentucky farmers are finding proportionately more nitrogen being marketed each year in the chemical form of urea. This trend has resulted from a greatly expanded production capacity for urea by basic nitrogen producers. Judging from present projections, this increase in the production of urea is likely to continue. Although urea nitrogen has been marketed in Kentucky for several years, there are still many questions asked by farmers about its agronomic characteristics.
Wells, Kenneth L.; Murdock, Lloyd; and Miller, H. F., "Urea as a Source of Fertilizer Nitrogen for Crops in Kentucky" (1978). Agriculture and Natural Resources Publications. Paper 24.