Choose Red in Output Channel and increase Red slider to 150. Reduce Green and Blue sliders to -25 to balance it. Repeat the similar steps for Green and Blue channels.
Output Channel: Red
Output Channel: Green
Output Channel: Blue
Click OK. Then choose Colors menu->Levels and increase the slider below input levels until you get a desire contrast.
After that, you will get a Velvia style photo. See the following pictures as a comparison between original and Velvia style.