If the earth were to cease rotating about its axis, then what is the increase in the value of gravity?

There is no adjustment in gravity, yet there is an adjustment in 'weightness'. 
Gravitational compel and weight with respect to an edge are not similar things, despite the fact that it is normally educated something else. 
Weight is really the aggregate of gravitational powers and of inertial drive for a question very still (no Coriolis compel) in a given casing. 
In the event that the Earth were not pivoting, weight would increment most at the Equator and be unaltered at the Poles.

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