Terrain textures use the diffuse map's alpha channel for specular. If your alpha channel is solid black, the texture won't have any shiny areas. Though it may still be dependent on having a proper normal map to look right.
Alternately, as Maity said, you can simply turn down the Terrain Specular in your lighting.
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Terrain textures use the diffuse map's alpha channel for specular. If your alpha channel is solid black, the texture won't have any shiny areas. Though it may still be dependent on having a proper normal map to look right.
Alternately, as Maity said, you can simply turn down the Terrain Specular in your lighting.