MULTAN : The Agri Department Monday asked farmers to cultivate onions as it could help country earn handsome foreign exchange. The department urged the farmers to cultivate onion by Sept. “Plough the land and also use cultivator two times. Mix 20kg urea in water and irrigate the cultivated area,” it added. “During cultivation of onion, also use one bag of DAP and a half bag potassium and apply onion at 75 centi-metre distance in the field,” the department proposed. The dept suggested the farmers to irrigate the crop every eight days and consult experts to improve quality and enhance production.