iphone - Releasing root view controller -

i have following statement inside

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions 

the statement :

root_view_controller = [[root_view_controller alloc] initwithnibname:@"base_view" bundle : nil]; 

i not using arc, thinking of releasing root_view_controller in

- (void)applicationwillterminate:(uiapplication *)application 

my question : above practice ok ? , : there other clean code should added before releasing root_view_controller ?

appdelegate.m

- (void)dealloc {     [_window release];     [_viewcontroller release];     [super dealloc]; }  - (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     self.window = [[[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]] autorelease];     // override point customization after application launch.     self.viewcontroller = [[[mlviewcontroller alloc] initwithnibname:@"mlviewcontroller" bundle:nil] autorelease];     self.window.rootviewcontroller = self.viewcontroller;     [self.window makekeyandvisible];     return yes; } 

if want release root_view_controller need in dealloc method code above