Here is a picture of the white stone bed.

The stones have nothing to do with the health of your plants other than perhaps increasing reflected heat (especially the white).

If you did a home soil test, it is not surprising you got the results you did....they are notoriously inaccurate, especially with regards to nitrogen. Nitrogen is the most mobile of the primary plant nutrients and the most ephemeral in its presence in the garden - even most professional soil testing labs do not measure nitrogen efficiently.

And spraying ammonia, even diluted, on the soil where your dogs pee is only complicating the problem. Urine IS ammonia (actually ammonium/urea) which is a highly concentrated form of nitrogen. This can burn plants, both leaves and roots, causing browning, wilting and even death. And a not very effective solution to the smell, either. Diluting with water is a much more effective approach. Or fence the area off so the dogs can't reach it.

Rocks as a mulch are a topic of a lot of debate. They are not very effective for weed control and may even be harder to keep tidy with respect to weeds, leaves or other blown-in debris. They offer nothing to plants or the soil and can reflect heat to the point where they scorch plants. About the only benefit is that it doesn't need to be replaced or refreshed very often.

An organic mulch - compost, bark, wood chips - laid at a decent thickness will suppress weed development, reduce soil moisture evaporation, insulate against swings in soil temperature and as it decomposes, add to soil biology and provide plant nutrients. Stone mulches do very little of this.

If you leave the stones in place, you are probably going to want to fertilize at least annually and make sure the plants get plenty of water to counteract that reflected heat. Better yet, since burning bush is a listed invasive plant in PA, rip 'em out and plant with something that likes lean soils and is drought tolerant.

Thanks for the reply.

Actually this was the third season since I laid down the red stone and I place weed preventer fabric down first.
Prior to this install, I used Roundup over the 700 square foot area following the recommended instructions on the best way to apply it and I did it twice in the Summer/Fall. I have had very few weeds come through this stone as the picture attests.
As for the soil test, I wonder if my aquarium test kit for either nitrite or nitrate will give me a reading. These test kits cost between $12.00 to $14.00.
On another note, someone indicated that the leaves are not wilting but are drooping and is normal.