Mango leaf lack of nutrients?

[nick]

Hope somebody can give advice.

Leaf of a tiny mango tree. The leafes are smaller than usual and the soil tends to alkaline. What can be done?

[Loxahatchee Adam]

If your soil is highly alkaline/limestone based, use sulphur-based fertilizers, spread granular sulphur pellets, mulch with pure peat moss, use Iron EDDHA (chelated iron in its most effective form) as a foliar spray.  

Is it a small grafted tree that you are keeping pruned?  Or large?

[nick]

thx for your reply.

So you think it is a lack of iron? I was not sure if iron or magnesium is needed. Normally I use iron Eddha 6% 1-2 times/year but maybe not enough. Some of my plants get also remaining coffee grounds to lower the ph. The soil tends to be and is not hilghly alkaline and the tree is a small grafted 2 inch nam doc mai mango with only little growth. I will feed with sulphur-based fertilizer as well. Oncemore thx for your support.

[rprimbs]

Are the young leaves yellow, or the older?  Older yellow leaves with green new leaves can indicate a nitrogen deficiency.  Older green leaves with yellow new leaves can indicate an iron deficiency.  At least that is what I have heard.  However I get things confused all the time..  And it also looks like a possible magnesium deficiency to me...