I don't consider myself a master fruit grower but I have been succesfully cultivating many fruits plantsduring my life and it never happened what is going on with chempedak.
I had 8 healthy seedlings, they were growing like rockets for the first 8-10 then they stopped putting new leaves.
I divided them in 4 gropus, some were repotted, some left untouched, some planted in the garden but no way, everything seems useless.
I was extremely careful with watering, i used the best soil, i applied light and well balanced fertilizer, i kept them partially shaded and protected from the scorching sun but nothing.
When i removed the first 2 that died i noticed that their root system was very poor and underdevelopped.
That would explain the reason of that strange leaf chlorosis they all eventually exhibited.
It's like they were growing well until they used the "energy" stored in their big seeds then once it was used up the small roots couldn't just keep up with thep lant growth and well being.
Until now the reason is unknown to me