Urea is a concentrated straight nitrogenous fertilizer that contains 46% nitrogen, which is a major plant nutrient. Nitrogen is a vital component of chlorophyll which is necessary for the photosynthesis process. It is applied to promote the vegetative growth of crops and orchards in splits (basal & top-dressing).
In irrigated crops, Mostly, Urea is applied to the standing crop followed by irrigation to minimize its losses. In rain-fed areas, it is often spread just before the rain to minimize losses through the volatilization process.