You can use acid fertilizers such as a 30-10-10. Most fertilizers that supply nitrogen as NH4+ (Ammonium) are acid fertilizers. Success with acid fertilizers all depends on how high you water's pH is. - Millet

Hi Sanguinello!

Thank you for your advice!

Hi Millet

Good idea. But not a lot of nitrogen?

You are very welcome !

There is no set amount of vinegar, or any acidic product, to add. The amount of vinegar, or any acidic product, that you would add, all depends on how high your water's pH is The main problem with vinegar is that it is an organic acid, and not a mineral acid. Therefore vinegar has a very short active life span once added to you tree's container. Water reduced to a pH of 4.5 has no alkalinity at all. - Millet

yes Millet, therefore it is given with the watering.

it works direct on the roots then when the plant takes the water.

This method invented monks 600 years ago in germany ...

Vinegar is used from time to time by hobby growers. No professional commercial grower would ever consider using vinegar as a pH regulant. Whatever, method Citrom decides to use, he must get the pH in the medium down to acceptable levels, or his trees will forever be having problems. If, as I suspect, Citrom's water is causing the problems, shown in the posted pictures, I am sure that there are also many other problems such as bicarbonates. carbonates. (which could be causing the problem with iron), and perhaps even other imbalances. - Millet

Yes. Unfortunately, I watered with tap water. I'm trying to acidified water. I hope you'll be fine. Improved a lot in the plant, is not it? But still not good enough ..

Hi!
It turns out that magnesium or sulfur deficiency was the problem. Other citrus greening back.

2012.09.08:

Great !!!

Glad you saved your trees !!!

Thank you for your help. The vinegar works.

Szívesen haver!

Szervus !

Very nice you are!(Nagyon rendes vagy! )

2012.10.01