How to make grass and terrain less shiny?

Please take a look at this screenshot.



My problem is that I can't make terrain surface and SpeedTree grass non-shiny. I don't think this effect looks nice. Grass is supposed to look diffuse because much of the light is absorbed and not reflected like from a clean metal sheet.

I tried to change terrain shader from standard to legacy diffuse, it only helps a little. I have tried adjusting the SpeedTree grass but I have not found a way to fix this. Any ideas?

 

So, no tips? I heard that 5.3 will bring some changes to BRDF model, maybe it will change terrain also?

 

it looks like your terrain textures have a high spec/smoth value?
Try setting it to black/0 if you dont use normal maps

 

No, smoothness is 0. But I fixed this by modifying the standard shader to allow more roughness and removed the option to match smoothness curve with toolbag 2.

 

Fixed in 5.3. Now standard metallic shader looks really natural, all the unremovable gloss is gone and matte surfaces really look matte. Thanks Unity devs!