"It's the first final for my players and they adapted well. When you play in a full stadium you have to adapt, enjoy it and play with responsibility. They showed they had enough experience."
The win came at the end of a 16-team tournament featuring Asia's leading youth teams, with the top four finishers - Uzbekistan, Iraq, Japan and South Korea - all qualifying for May's FIFA Under 20 World Cup in Indonesia.
Ravshan Khaydarov's side won the title despite struggling in front of goal for much of the competition.
Uzbekistan scored twice in their last four games in the competition and needed penalties in the quarter-finals to see off Australia before also beating the Koreans in a shootout to advance to the final.
It took another penalty for the hosts to win the decider, Rahmonaliev netting after the tournament's most valuable player, Abbosbek Fayzullaev, was cut down in the box by a clumsy challenge from Iraqi defender Sajjad Mohammed.
"These players have a very beautiful future," Khaydarov said.
"Maybe they made some mistakes and we're only scoring goals from penalties, so our mission is to score more."
Vietnam exited the tournament because of goal difference after losing 1-3 to Iran in the last group state game on March 7. They beat Australia and Qatar in the other two group stage matches.
U20 Asian Cup final: Uzbekistan 1-0 Iraq
