Lack of vigor, chlorotic or pale leaves, small leaves, and many other symptoms may have numerous causes.
Many orchard problems have their origin underground and can easily be overlooked.
Secondly, recognize bias. People with different experiences and technical training may diagnosis the same problem very differently. Symptoms of potassium or magnesium deficiency may not appear until August. Top of page Diagnostic tools Visual diagnosis - because Ca, B, Cu, Fe, Mn, and Zn are rather immobile in plants, deficiency symptoms will most likely occur on new growth first. In contrast, the more mobile N, P, K, and Mg symptoms will appear on older plant parts.