My 2 year old Calamansi tree is showing signs of iron deficiency, but it doesn’t make sense. Could it be something else?
The leaves look just like here for iron deficiency: HS-797/CH142: A Guide to Citrus Nutritional Deficiency and Toxicity Identification
However, I also have a meyer lemon and rangpur lime grown under identical conditions in 5 gallon pots. Nov through April they are indoors under LED light and get fed weekly with a 4x diluted solution of Jacks Classic No.1.5 20-10-20 Citrus Food Fertilizer. Outside in the summer they get big scoop of organic 5-5-5 fertilizer and worm castings. pH = 6 in all three.
How can one citrus be showing signs of Iron deficiency in same growing conditions as two others that don’t? Despite the leaf appearance, they tree looks otherwise healthy, had a productive winter, put out good growth in late spring, and is about to flower.
I have been applying chelated iron foliar spray every other day and put down some azomite granules in the soil about 10 days ago and haven’t seen any improvement yet. How long should it take assuming correct diagnosis? Should I do anything else?