Phenyl phosphorodiamidate is an organophosphorus compound with the formula C6H5OP(O)(NH2)2.

A white solid, it is used as an inhibitor of urease,[1] an enzyme that accelerates the hydrolysis of urea.

In this way, phenyl phosphorodiamidate enhances the effectiveness of urea-based fertilizers.

It is a component of the technology of controlled release fertilizers.

[2] In terms of its molecular structure, phenyl phosphorodiamidate is a tetrahedral molecule structurally related to urea, hence its inhibitory function.