Thread: white pines

I planted 4 white pines in my backyard about 2 weeks ago. They are each 3-5 feet in height. I read about them before planting and the type of soil they need, how to plant them, etc. I put in a pvc pipe about 2 inch in diameter right beside the tree about halfway down the side of the rootball for watering so the water goes directly down to the roots promoting downward root growth. Each day I've watered them, allowing water to flow in the pipe for approx 8-10 seconds. Also when planting I added some fertilizer to the surrounding soil.

I've noticed this week that they are turning yellow. All 4 of them. Seem to be turning yellow from the top down as the bottom branches seem to be greener.

I've researched, can't find really anything on signs of overwatering or underwatering. It's summer here, so not really the time of year for needle shedding.

Any ideas from you green thumbs?