If a tree is deficient in iron, then it is proper to apply iron in order to cure the deficiency. Just as one should not give medicine to a patient that is not sick, one should not apply fertilizer if it is not needed. Supplying iron, or anything, if it is not required is not a good idea. Harana's trees are 2 years old. Therefore, the recommendation for a 2 year old citrus tree is 5-LBS. of actual nitrogen per year, applied over 5 applications. The amount of fertilizer applied per each application depends on the analysis of the fertilizer. If Harana purchases a bag of 8-8-8 the solution would be: divide pounds actual nitrogen required by the tree per year (5-lb.) by % nitrogen of the fertilizer used. For Harana's two year old citrus tree SOLUTION: 5/.08 = 6.2-lbs. divided by the 5 applications, or 1.2-lbs.per each application.