The high pH of the local soil is responsible for the iron chlorosis, a condition that causes leaves to yellow, leaving just the veins green.
Root die back can worsen the chlorosis by further limiting nutrient uptake.
The brown leaf tips are due to salt damage. Salt that is in the soil travels up the tree all the way to the tips of the leaves, where it can go no farther, so it concentrates there and eventually causes the leaf tissue to die. The dry wind worsens the condition by increasing the rate of evaporation from the leaves, which further increases the concentration of salt. Some of it was already present in the soil, and the tap water also contains some salt. The frequent, shallow waterings have been gradually adding salt to the soil, as the water evaporates, the salt migrates up to the top of the soil where, unfortunately, the roots are.