Amur maple leaf variance

[Backwardsvg]

Hello all I have some amurs that I planted into a forest this spring. I am wondering why a few trees have this light yellow leaf color. They have had it since leafing out so I do not think it’s watering. But maybe I am wrong? Let me know your thoughts thanks.

 

[jszg]

Looks like chlorosis

 

[Backwardsvg]

So just fertilize more for them ? Just is weird that only 2 of 9 trees are showing it

 

[Shibui]

Unusual that not all in the same pot are showing symptoms but the leaf pattern looks very much like nutrient deficiency.
What fertilizer have you used and how often?
Chlorosis can be caused by high pH. If possible check pH and use acid fertilizer to counteract high pH water or soil.
Many soil less mixes don't have enough Iron. Commercial mix has Fe added to help counteract Fe lockup by high pH. You could try Chelated Iron or Iron Sulfate if straight fertilizer doesn't help.

 

[rockm]

Chlorotic leaves. Iron or other supplements could help. Plain old epsom salt--a half teaspoon to a gallon of water may help.

 

[Backwardsvg]

Thank you both, I have just used miraclegrow till it is gone, looking to change soon. I may try the epsom salt, thank you!

 

[Shibui]

Epsom salts is Magnesium. Mg deficiency can sometimes cause chlorosis in some plants which is why it is sometimes recommended. Mg is a mobile element in plants so symptoms are usually worse in OLDER leaves as the plant can move the little available to new growth to try to survive. Mg deficiency pattern is patchy yellowing all over the leaf often with a triangle of green near the stem.
Fe is immobile so symptoms are seen in YOUNGER leaves because plants cannot move iron to help new growth. Fe deficiency is typically yellow between veins while veins stay green.
Symptoms I can see look far more like Fe deficiency than Mg.

Lowering pH should make both Mg and Fe more available and cure the chlorosis whatever is causing it.
A dose of trace elements will also supply all the useful elements but, again, we will not know what the deficiency was, just that it was a trace element deficiency.

 

[0soyoung]

Amur leaves will also do this (or appear very similar to that in the photo) when not getting adequate sunlight.