One thing that may help is that evergreens like the soil to be somewhat acidic.
You
can check this with a simple PH testor, or you can simply add something like
Miracle Grow for Evergreens, which will sweeten up the soil.

Sherwin

bruceh wrote:

My father has a couple of old (Japanese?) pine trees, each
about 8 feet tall in which the needles are browning.
He says that he only waters the trees and has never used
any fertilizer.

Is there any fertilizer/additive that can help with
these trees?

TIA