Hi all

I have two potted avocados. Please see below link for image. The one on the left is pretty young. The one on the right was pretty healty but day by day leaves withering and it seems the growth of plant stopped.
http://imgur.com/a/GCXeZ

I used two handful of desert sand at the bottom of of pods to provide some minerals. Desert sand in here is extremely rich with minerals. The rest of the pot is filled with torf. Regular torf as you know. Also in the right pot i put two handful of desert sand to surface. which may decrease the drainage, which may caused the leaves wither. I'm not sure.

The plant is located rather shady area but couple of hours each day it receives direct sunlight. And it is always under extreme heat. heat around 40 - 45 degrees celcius.

The pot has no holes for over-watering so when i pour water to the pot all the waters stays inside the pot even if the pot overflows. There is no drainage.

I add half liter tap water each 3 or 4 days.
Please comment what is wrong with the plant.

Regards

Volkan