ONION PRODUCTION AND ITS CONSTRAINTS IN IRAN
Common cultural methods of onion production are used in Iran. Direct seeding and transplanting are both popular. The average cultivated area of onion is 44 241 ha and total production is about 1 125 050 t/year, with an average yield 25.43 t/ha. Due to the single annual production season, onion is stored in Iran through the rest of the year. Bulb losses during storage are greater than 35%.