Verbs like bilmek, söylemek, anlamak, düşünmek, okumak  -  which express becoming aware of something or sharing this awareness  -  usually take accusative object in Turkish.

               Bun|u gazetede okudum.

               Biz sorumluluğumuz|u biliyoruz.

But sometimes there is need to express that the whole knowledge was not transferred. I mean sentences like ´I read about it´, ´He told (something) about what happened´, ´I understand something about it´. How are they expressed in Turkish? Is postposition structure with hakkında the only way? What about using ablative instead of accusative in order to express partial object?

He told [something] about what happened

[O] olan bitenle ilgili bişeyler söyledi. ---> alternatively we can use  "ilgili" instead of "hakkında".   when we use "ilgili " we have to use "with " [ile]

Onunla [onun + ile ] ilgili ne düşünüyorsun ?

  OR ;

[O] ne olduğunu [olan biteni] anlattı.

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I read about it. --->  O konuda [birşeyler] okudum. [ we can use "locative" with "konu" ] literally ;

I read on that subject [ literally]

OR ;

Onunla alakalı birşeyler okudum. ---> here "alakalı" is "related" ;

I read something related to it. [literally]

note : we must put "something" [birşeyler or şeyler ] to make it sense in Turkish.

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Teşekkürler, tunci. Yes, I have noticed this konu thing before.

You have made it terribly complicated for yourselves. Not typical to Turkish at all.

Actually it came to my mind that the same problem of partial objects concern also verbs with more concrete meaning. If we, for instance, want to make a difference between 1. ´I ate an apple (the whole of it)´ and 2. ´I ate some apple´ I would suggest

           1. Bir elma yedim

           2. Elma yedim

but I am not sure if I´ve got a clue at all. And what in this case would be the exact meaning of the definite object in

           3. Elmayı yedim

Would it be the whole apple or a part of it?

There also is this word dair that means concerning; about; relating to..

-a/e dair

Bunun hakkında = Bununla ilgili = Bununla alakalı = Buna dair 

          3. Elmayı yedim

Would it be the whole apple or a part of it?

It is never less than one whole apple..

What about

              Elma yedim

can it be just one bite? The amount is not the issue, eh?

              Elma yedim

can it be just one bite? The amount is not the issue, eh?

"The amount is not the issue" 

Bütün bir elma -- a whole apple

Yarım elma -- half apple

Bir dilim elma -- a slice of apple

Dilimlenmiş elma -- apple in slices

Tamamen yenmiş elma - fully eaten apple

Yarısı yenmiş elma - half eaten apple

kısmen yenmiş elma -- partly eaten apple

Soyulmuş elma -- peeled apple

Soyulmamış elma -- unpeeled apple

Çürük elma -- rotten aple

Yeşil elma -- green apple

kırmızı elma -- red apple

Elma kurusu/kurutulmuş elma -- dried apple

ham/olmamış elma -- unripe apple

Olmuş elma -- ripe apple

Daldaki elma -- apple on branch

Ağaçtaki elma -- apple on tree

Elma ağacı -- apple tree

Elma fidesi -- apple seedling

Elma fidanı -- apple sapling

Such a masterpiece post !

Hocam, mahçup ediyorsunuz..