MOSCOW, Aug 10. If nitrates are in a watermelon or melon, then they are near the rind, so it is worth eating them until the green part, Antonina Starodubova, chief nutritionist of the Moscow Health Department, told RIA Novosti. So eat watermelon and melon until the green part, «Starodubova said. The agronomist told how to buy a watermelon without nitrates, while she noted that it is better to choose such fruits so that they can be eaten without leaving the next day. Cut watermelons and melons should only be stored in the refrigerator, covered with cling film.