CAIRO, Dec 26 (Reuters) - Egypt's President Mohamed Mursi urged all political powers on Wednesday to take part in a national dialogue to resolve lingering tensions and promised to take necessary steps to heal the economy.

In his first address to the nation since the adoption of a new constitution, he said he was considering possible cabinet changes and planned to introduce incentives to make Egypt a more attractive investment destination.

"The coming days will witness, God willing, the launch of new projects ... and a package of incentives for investors to support the Egyptian market and the economy," he said in a televised speech.