Yellowing juniper

Hi guys can i get some help with some of my juniperus virginiana. They are still growing and back budding with new growth. But are still yellowing and dieing back inside. They are in full sun. I keep an eye on my watering when the top 2 inch is dry i water. I live in Australia Queensland. We are in summer now

What substrate is it in? I would say that allowing the top two inch to dry is probably stressing or killing the surface roots. Given that you are in summer which is usually hot, I would be watering when the surface (down to about 1/4 inch) is dry. It may need protecting during the hottest part of the day.