The maximum concentration limit of urea for spraying is

Solution (By Examveda Team)

Urea is the most important nitrogenous fertilizer in the country because of its high N content (46%), which is required for the growth and development of the crop.
The maximum concentration limit of urea for spraying is 4%. Concentration should always be kept in mind before spraying any insecticide or fertilizer as excess may harm to an extreme extent the crops.