In some groups of plants, the administration of urea as a sole source of nitrogen may cause disturbances in morphophysiology and metabolism. A better understanding of plant urea metabolism involving uptake, storage, internal transport, hydrolysis and assimilation of urea nitrogen will be required to assess and possibly improve direct usage of urea by plants (without prior soil conversion) in agricultural settings employing urea fertilization. (Wang et al., 2008; Witte, 2011).