Mark out on a new layer the land’s zone with Rectangular Marquee Tool (M) and apply on it the Gradient Tool (G) to represent a gradient on diagonal direction (set on the layers Blending Mode – Hard Light).
The parameters for this layer:

A total view:

Create a new layer of 4×4 px and 72 dpi and select the Pencil Tool (B) to represent a kind of ready to use texture colored with 184E92.

Save it!

Apply on a new layer Edit>Fill where we may find there the earlier saved cliché.

Fill 70% on the layers.