Personally I was always taught that if you attach your camera to a tripod, then you should turn OFF vibration reduction/image stabilisation.
VR / IS is looking for the minute movements of a handheld camera. If there are none, the moving elements can actually 'cause' some level of blur. Therefore, any tripod work (in which, inherently you won't get camera shake), you should turn the VR mode OFF.
If you are hand-holding, then turn the VR ON, and if it's not enough, try to increase your shutter speed by boosting your ISO.
However for good landscape shots, I would recommend the tripod route, VR OFF, ISO 100 (again, doesn't matter as you're using a tripod so you can afford to have a longer exposure), shoot in aperture priority at anywhere between f/8 to f/16. No higher.