Jambolan bonsai

I am growing Jambolan bonsai from seeds now my bonsai are 10 inch long. How can I know that its time to add compost in my bonsai? And how?

iskhan nice work.i think you will find difficulties to train as bonsai.when we culture it sometime its start dying back from that branch.
if i am right your tree is less then an year old,so please let it grow for couple of years before you start to train it as bonsai.these are my suggestions.
is it in pot or in ground?
regarding soil use a well drained bonsai soil for it.it do well in the rather dry and well drain soil.
good luck.

Initially I know nothing but for your forum I learn
1)how to make compost and I make it.
2)how to make soil for bonsai and I make it.
3)how to make pot for bonsai and I make it.
Then I germinate Jambolan seeds in the bonsai pot now the plant size is approx. 10inch height.
PROBLEM
Problem is last time I grow 10 seeds in ordinary pot with ordinary soil of gardening but all of them grow 10inch successfully but then they turn black from root to top and die Why?
Now I am growing again in bonsai pot and soil and it become 10inch long and I am afraid what to do if same thing appear again.

dont worry iskhan,its learning process,you may find some difficulties though but fruite will be better.
i think your plants died due to over watering.jamuns like well drain soils.
making bonsai from the seed or germination is very slow process,please plant them in big ordinary gardening pots or in grounds,when they got good stems/trunks then convert them in bonsai training pot.please not training pots are not the simple bonsai pots,they are usually big in size incomparable to regular bonsai pots.please see the few sample training pots.
http://knowledgeofbonsai.org/pots-slabs-pottery/grow-boxes-and-training-pots/ (source knowledge of bonsai )

after training them 2 or more years in the training pot,plant them in the regular bonsai pot of your choice.
its lengthy but proper way to make and train a Bonsai.

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Now my Jambolan Bonsai is 1 year old and try to some thing like above image. The only jambolan bonsai I found.

That's a 1 year old tree? Wow... Jambolan grows fast. Pruning must be a pain because you would have to do it very frequently.

The tree looks very nice. You have a good slant style in the making. Leaf size maybe an issue, but other than that this tree has a promising future.

- AH

Yes Jambolan grows fast but not too fast as you think. And this not my bonsai as I mentioned the only Jambolan bonsai I found or saw.