1.3. Why controlled release coated urea (CRCU)?
Urea is the most widely used fertilizer globally because of its high
nitrogen content (46%), low cost, and ease of application [7,17]. Therefore,
the development of CRCU has been a subject of interest for decades
[18]. When applied to the soil, urea undergoes a series of biological,
chemical and physical transformations to produce plant available
nutrients as follows [7].