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This is a paid asset, but now you can download Dry Grass and Mud Photo-Texture Free.
Detail this asset from Unity Store: Original Link
Dry Grass and Mud Photo-Texture v1.0
10 HQ (Smoothness(A)) Photo-Texture Dry Grass and Mud for the standard Unity Terrain.
All textures seamless with a resolution of 2048×2048 .Albedo texture formats TGA(Smoothness(A))
Normal map formats PNG
Textures made specifically for the terrain shader Unity(Built in Standard Metallic)
Textures are aimed to create AAA quality games