I purchased a new truck, and I usually put all Farm expenses on Schedule F, but I don't see where to do the depreciation.

I put in the Truck mileage on Schedule F, so how/where do I input the depreciation information?

Also This year I will have about 60% business use, but going forward it may only be 20% Business Use. How can I take the depreciation deduction for just this year so I don't have to pay back in the future years?

Thanks!