If indeed it is a salt problem, and Chas is probably correct, keeping the tree on the dry side makes the salt situation worse, because the soluble salts become more concentrated in the root zone when there is less water. The tree is telling us that it needs more watering by the cupping of the leaves. As far as nutrition, it is water that moves nutrients such as nitrogen potassium, iron and magnesium throughout the tree. High soluble salt levels at the root zone blocks the up take of nutrients, thus giving the tree the yellowish look. As Chas wrote, there is some browning at the tips of the leaves, but it is not at the point of killing the leaf tips. Give the tree a good flush with clean pure water in the amount of three of four times the volume of the container. Then fertilize the tree and you should see the tree starting to recover. If the irrigation water you use for your regular watering has a high soluble salt content, then flush the container at a regular interval, perhaps once every couple months with pure water having a very low salt content. . - Good luck and thanks for joining this forum - Millet
