UPDATE 3-Nigeria cbank moves to ease exchange rate disparity

* Central bank to boost dollar supply to bureaux de change

* Central bank to hold daily forex auctions

* Naira seen strengthening against dollar in black market

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By Randy Fabi

ABUJA, March 17 (Reuters) - Nigeria's central bank will increase U.S. dollar supply to bureaux de change in an effort to reduce the sharp disparity between its official exchange rate and the black market, Governor Chukwuma Soludo said on Tuesday.

The central bank also announced it would increase the frequency of its foreign exchange auctions to a daily release from the current twice-weekly regime, in an effort to meet all legitimate demand for U.S. dollars.

The regulator imposed restrictions on forex trading between banks in February, meaning that the black market became the main alternative source of U.S. dollars to its auctions.