What's Happening to My Adenium

So, I recently got an Adenium. After bringing it, I put it in a place where it'll get lots of sunlight, repotted it.
But all the leaves are going yellow. At first it shows up as green-yellow marbeling and then progresses to almost full yellow in the span of a day or two. I watered it very sparingly.
So, what's happening?
For comparison, when I brought it-
Also what is this red bud like thing?
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It doesn't have black, rotting roots- I checked. The change happened within 4-5 days.
I think, as several have said before, that you need to get yourself some decent potting compost, that looks like it’s in baked hard garden soil again. Not sure if there’s much hope for this one either, but worth a try.
It's a mix of garden soil, compost and sand. No matter what I throw at it, the sun bakes pretty much everything. Even compost I watered in morning looks white and dry granular in evening.
Last edited: 07 February 2018 10:01:17
You could try covering the top with lots of bark to try to prevent evaporation and provide more organic matter as it decomposes down.
Adeniums come from S.African desert areas , and are adapted to hot-days and pretty chilly nights ; perhaps the constant heat and humidity of Calcutta is affecting it somehow .
Possibly the 'red bud like thing' is exactly that .