You can do this without Optifine using models and block states. Have a model for each different moistness level, just the texture on top is different. You then make a block state so that if the moistness of the farmland is x, it will use model x, which references texture x.

Cool idea, but doesn't work on 1.16.4 with Optifine HD U G5.

its not working

is this programmer art compatible?

wow, this is a awesome pack i didn't even know farmland had multiple block states.

Cool pack, but it is not working for me. Help pls ( T _T )